YJ No Spark
#41
Guest
Posts: n/a
Re: YJ No Spark
I'll be darned, I had been thinking it was a reluctance head pickup all
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
#42
Guest
Posts: n/a
Re: YJ No Spark
I'll be darned, I had been thinking it was a reluctance head pickup all
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
#43
Guest
Posts: n/a
Re: YJ No Spark
I'll be darned, I had been thinking it was a reluctance head pickup all
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
these years, a device I'm very familiar with. I've used them in similar
circuits to generate timing pulses just like this particular circuit.
Thanks!
Jerry
bllsht wrote:
> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>
>
>>Then tell us all what a reluctance head pickup is, because that is
>>exactly what the CPS is.. :)
>
>
> Exactly wrong...
>
> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire sensor.
> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in the
> sensor, and a 5 volt reference(signal circuit). These voltages are present any
> time the key is on.
>
> The sensor alternates between pulling the reference voltage to ground (zero
> volts), and releasing (5 volts), depending on whether it's aligned with a "gap"
> or a "tooth".
>
> Put a lab scope on the signal circuit and you'll see a 5 volt square wave. No
> current is generated by the sensor.
>
> I don't know what you're thinking of but it's not a 95 Jeep.
>
>
>
>
>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>engine is running... and then that current is self-generated. :)
>>>
>>>
>>>The crank sensor operates on voltage that is supplied by the PCM anytime the key
>>>is on, running or not, and does not generate current.
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>Dave Lee wrote:
>>>>
>>>>
>>>>>Interesting. Now, I was having trouble before it died, and one morning I
>>>>>went to the jeep and found the key in the on position, heater fan blowing.
>>>>>Would juice through the ignition wires overnight hasten its demise??
>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>news:420911CF.57916359@***.net...
>>>>>
>>>>>
>>>>>
>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>Sensor:
>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>> God Bless America, ßill O|||||||O
>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs, and
>>>>>>>coil.
>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from the
>>>>>>>starter, or thereabouts down there.
>>>>>>>
>>>>>>>Any ideas?
>>>>>>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
#44
Guest
Posts: n/a
Re: YJ No Spark
So, with this in mind, could a sensor in a weakened condition be killed off
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
#45
Guest
Posts: n/a
Re: YJ No Spark
So, with this in mind, could a sensor in a weakened condition be killed off
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
#46
Guest
Posts: n/a
Re: YJ No Spark
So, with this in mind, could a sensor in a weakened condition be killed off
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
by leaving the key on for several hours?
"Jerry Bransford" <jerrypb@***.net> wrote in message
news:2WLOd.9588$Tt.7674@fed1read05...
> I'll be darned, I had been thinking it was a reluctance head pickup all
> these years, a device I'm very familiar with. I've used them in similar
> circuits to generate timing pulses just like this particular circuit.
> Thanks!
>
> Jerry
>
> bllsht wrote:
>> In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>
>>
>>>Then tell us all what a reluctance head pickup is, because that is
>>>exactly what the CPS is.. :)
>>
>>
>> Exactly wrong...
>>
>> The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>> sensor.
>> The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>> the
>> sensor, and a 5 volt reference(signal circuit). These voltages are
>> present any
>> time the key is on.
>>
>> The sensor alternates between pulling the reference voltage to ground
>> (zero
>> volts), and releasing (5 volts), depending on whether it's aligned with a
>> "gap"
>> or a "tooth".
>>
>> Put a lab scope on the signal circuit and you'll see a 5 volt square
>> wave. No
>> current is generated by the sensor.
>>
>> I don't know what you're thinking of but it's not a 95 Jeep.
>>
>>
>>
>>
>>
>>>Jerry
>>>
>>>bllsht wrote:
>>>
>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>
>>>>
>>>>
>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>engine is running... and then that current is self-generated. :)
>>>>
>>>>
>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>the key
>>>>is on, running or not, and does not generate current.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Jerry
>>>>>
>>>>>Dave Lee wrote:
>>>>>
>>>>>
>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>demise??
>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>news:420911CF.57916359@***.net...
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>Sensor:
>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>
>>>>>>>Dave Lee wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>and
>>>>>>>>coil.
>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>the
>>>>>>>>starter, or thereabouts down there.
>>>>>>>>
>>>>>>>>Any ideas?
>>>>>>>
>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
#47
Guest
Posts: n/a
Re: YJ No Spark
Nope, a Hall Effect device doesn't draw even close to that much current.
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
#48
Guest
Posts: n/a
Re: YJ No Spark
Nope, a Hall Effect device doesn't draw even close to that much current.
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
#49
Guest
Posts: n/a
Re: YJ No Spark
Nope, a Hall Effect device doesn't draw even close to that much current.
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
Jerry
Dave Lee wrote:
> So, with this in mind, could a sensor in a weakened condition be killed off
> by leaving the key on for several hours?
> "Jerry Bransford" <jerrypb@***.net> wrote in message
> news:2WLOd.9588$Tt.7674@fed1read05...
>
>>I'll be darned, I had been thinking it was a reluctance head pickup all
>>these years, a device I'm very familiar with. I've used them in similar
>>circuits to generate timing pulses just like this particular circuit.
>>Thanks!
>>
>>Jerry
>>
>>bllsht wrote:
>>
>>>In message <4AjOd.8965$Tt.2731@fed1read05>, "Jerry Bransford" wrote:
>>>
>>>
>>>
>>>>Then tell us all what a reluctance head pickup is, because that is
>>>>exactly what the CPS is.. :)
>>>
>>>
>>>Exactly wrong...
>>>
>>>The crank sensor used on a 95 YJ is a hall effect device. It's a 3 wire
>>>sensor.
>>>The PCM (SBEC) supplies the ground, 8 volts to operate the circuitry in
>>>the
>>>sensor, and a 5 volt reference(signal circuit). These voltages are
>>>present any
>>>time the key is on.
>>>
>>>The sensor alternates between pulling the reference voltage to ground
>>>(zero
>>>volts), and releasing (5 volts), depending on whether it's aligned with a
>>>"gap"
>>>or a "tooth".
>>>
>>>Put a lab scope on the signal circuit and you'll see a 5 volt square
>>>wave. No
>>>current is generated by the sensor.
>>>
>>>I don't know what you're thinking of but it's not a 95 Jeep.
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Jerry
>>>>
>>>>bllsht wrote:
>>>>
>>>>
>>>>>In message <Zt9Od.8377$Tt.943@fed1read05>, "Jerry Bransford" wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Nope, the CPS doesn't have any current flowing through it unless the
>>>>>>engine is running... and then that current is self-generated. :)
>>>>>
>>>>>
>>>>>The crank sensor operates on voltage that is supplied by the PCM anytime
>>>>>the key
>>>>>is on, running or not, and does not generate current.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Jerry
>>>>>>
>>>>>>Dave Lee wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Interesting. Now, I was having trouble before it died, and one morning
>>>>>>>I went to the jeep and found the key in the on position, heater fan
>>>>>>>blowing. Would juice through the ignition wires overnight hasten its
>>>>>>>demise??
>>>>>>>"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
>>>>>>>news:420911CF.57916359@***.net...
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Ninety nine percent of the time that'll be the Crankcase Position
>>>>>>>>Sensor:
>>>>>>>>http://www.off-road.com/jeep/cheroke...tdcsensor.html
>>>>>>>> God Bless America, ßill O|||||||O
>>>>>>>>mailto:-------------------- http://www.----------.com/
>>>>>>>>
>>>>>>>>Dave Lee wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>ok people, it's a 95 YJ, 4 cyl., 5 speed.
>>>>>>>>>No spark. I replaced the distributor, the cap & rotor, wires, plugs,
>>>>>>>>>and
>>>>>>>>>coil.
>>>>>>>>>No spark. When I had my wife crank the engine I noticed a spark from
>>>>>>>>>the
>>>>>>>>>starter, or thereabouts down there.
>>>>>>>>>
>>>>>>>>>Any ideas?
>>>>>>>>
>>--
>>Jerry Bransford
>>PP-ASEL N6TAY
>>See the Geezer Jeep at
>>http://members.***.net/jerrypb/
>
>
>
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
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