97 Jeep Cherokee - No Spark
 

I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
I have had to do is basic servicing. I have had zero faults. Last
weekend it would not start (no spark or fuel being injected), and a
friend towed me home. I have since spent several hours on the web to
try and find a fix. I have read all about the CPS and the cam sensor in
the distributor, plus checking the fuel pump etc.

So far I have established there is fuel under pressure in the fuel rail
by pressing the pin on the valve, I checked all fuses and swapped
around the relays, and I have disconnected and reconnected the battery
after giving it a full charge. The earth strap from the cyl head to
bulkhead is in good order. I have disconnected and reconnected the CPS
several times.

The instruments and warning lights are behaving as normal. i.e. The
warning lights come on when the ignition is switched on and then go out
after a few seconds. The check engine light comes on then goes off with
the others.

I then ran the diagnostics by holding down the trip meter button and
turning on the ignition. It ran through the numbers from 000000 to
999999 and then went back to 0.000. It did not come up with any faults
or a 55 to say the test was complete. I then tried the test with CPS
disconnected and still got no fault showing. Whilst indexing through
000000 111111 222222 etc., all the gauges seemed to go through a
sequence increasing in value and then decreasing back to zero.

So the diagnostics do not indicate a problem or even show that the
battery has been disconneted recently.... But I still have no spark or
fuel. Any ideas or suggestions. thanks in advance

Bob Turner

Re: 97 Jeep Cherokee - No Spark
 

Bob,

Since no one's jumped into the quagmire just yet, let me remind you
that code retrieval is on-off-on-off-on within 5 [?] seconds, not the
instrument cluster test you're performing. While we're at it, your CPS
may not trip a code simply unplugged unless you're cranking. Your
logic, to the best of my knowledge, is headed in the right direction
with the no spark, no injector symptom.

There -- step one.

Jon

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner

Re: 97 Jeep Cherokee - No Spark
 

Bob,

Since no one's jumped into the quagmire just yet, let me remind you
that code retrieval is on-off-on-off-on within 5 [?] seconds, not the
instrument cluster test you're performing. While we're at it, your CPS
may not trip a code simply unplugged unless you're cranking. Your
logic, to the best of my knowledge, is headed in the right direction
with the no spark, no injector symptom.

There -- step one.

Jon

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner

Re: 97 Jeep Cherokee - No Spark
 

Bob,

Since no one's jumped into the quagmire just yet, let me remind you
that code retrieval is on-off-on-off-on within 5 [?] seconds, not the
instrument cluster test you're performing. While we're at it, your CPS
may not trip a code simply unplugged unless you're cranking. Your
logic, to the best of my knowledge, is headed in the right direction
with the no spark, no injector symptom.

There -- step one.

Jon

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner

Re: 97 Jeep Cherokee - No Spark
 

Bob,

Since no one's jumped into the quagmire just yet, let me remind you
that code retrieval is on-off-on-off-on within 5 [?] seconds, not the
instrument cluster test you're performing. While we're at it, your CPS
may not trip a code simply unplugged unless you're cranking. Your
logic, to the best of my knowledge, is headed in the right direction
with the no spark, no injector symptom.

There -- step one.

Jon

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner

Re: 97 Jeep Cherokee - No Spark
 

I'll jump in too. I would recommend you get a manual for it, even a
Cheapie Haynes gives the multimeter tests for the coil and some for the
ignition module to see if they are still good.

Maybe you can find the manual online, I know a few are...

I don't know if you can retrieve codes in a 97 or not, but it is key on,
off, on, off, on within a few seconds if it works.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner
>

Re: 97 Jeep Cherokee - No Spark
 

I'll jump in too. I would recommend you get a manual for it, even a
Cheapie Haynes gives the multimeter tests for the coil and some for the
ignition module to see if they are still good.

Maybe you can find the manual online, I know a few are...

I don't know if you can retrieve codes in a 97 or not, but it is key on,
off, on, off, on within a few seconds if it works.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner
>

Re: 97 Jeep Cherokee - No Spark
 

I'll jump in too. I would recommend you get a manual for it, even a
Cheapie Haynes gives the multimeter tests for the coil and some for the
ignition module to see if they are still good.

Maybe you can find the manual online, I know a few are...

I don't know if you can retrieve codes in a 97 or not, but it is key on,
off, on, off, on within a few seconds if it works.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner
>

Re: 97 Jeep Cherokee - No Spark
 

I'll jump in too. I would recommend you get a manual for it, even a
Cheapie Haynes gives the multimeter tests for the coil and some for the
ignition module to see if they are still good.

Maybe you can find the manual online, I know a few are...

I don't know if you can retrieve codes in a 97 or not, but it is key on,
off, on, off, on within a few seconds if it works.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

bob.turner@clix.pt wrote:
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner
>

Re: 97 Jeep Cherokee - No Spark
 

Hi Bob,
Ninety nine percent of the time it will be the Crankshaft Position
Sensor. I would go ahead and replace it:
http://members.cox.net/wilsond/Fixes...tml#CPSdetails
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

<bob.turner@clix.pt> wrote in message
news:1169058517.096718.313280@a75g2000cwd.googlegr oups.com...
> I have a 97 cherokee 4.0L Auto, with just 68K miles. In three years all
> I have had to do is basic servicing. I have had zero faults. Last
> weekend it would not start (no spark or fuel being injected), and a
> friend towed me home. I have since spent several hours on the web to
> try and find a fix. I have read all about the CPS and the cam sensor in
> the distributor, plus checking the fuel pump etc.
>
> So far I have established there is fuel under pressure in the fuel rail
> by pressing the pin on the valve, I checked all fuses and swapped
> around the relays, and I have disconnected and reconnected the battery
> after giving it a full charge. The earth strap from the cyl head to
> bulkhead is in good order. I have disconnected and reconnected the CPS
> several times.
>
> The instruments and warning lights are behaving as normal. i.e. The
> warning lights come on when the ignition is switched on and then go out
> after a few seconds. The check engine light comes on then goes off with
> the others.
>
> I then ran the diagnostics by holding down the trip meter button and
> turning on the ignition. It ran through the numbers from 000000 to
> 999999 and then went back to 0.000. It did not come up with any faults
> or a 55 to say the test was complete. I then tried the test with CPS
> disconnected and still got no fault showing. Whilst indexing through
> 000000 111111 222222 etc., all the gauges seemed to go through a
> sequence increasing in value and then decreasing back to zero.
>
> So the diagnostics do not indicate a problem or even show that the
> battery has been disconneted recently.... But I still have no spark or
> fuel. Any ideas or suggestions. thanks in advance
>
> Bob Turner
>