The TPS on my XJ has 2 pigtails one sends a voltage signal to the
transmission controller. The spec for the TPS output to the
transmission controller is about 4v, if it's only putting out .34v
wouldn't that affect the tranny? I had the same problem 4 yrs ago and a
new TPS was the fix.

Thanks, JK

 

The TPS on my XJ has 2 pigtails one sends a voltage signal to the
transmission controller. The spec for the TPS output to the
transmission controller is about 4v, if it's only putting out .34v
wouldn't that affect the tranny? I had the same problem 4 yrs ago and a
new TPS was the fix.

Thanks, JK

 

The TPS on my XJ has 2 pigtails one sends a voltage signal to the
transmission controller. The spec for the TPS output to the
transmission controller is about 4v, if it's only putting out .34v
wouldn't that affect the tranny? I had the same problem 4 yrs ago and a
new TPS was the fix.

Thanks, JK

 

Your readings don't sound right to me...

With the engine off and the key on run, the AC off, you should see a
0.026 volts. When you open the throttle all the way, you should see 4.8
volts.

The TPS for the auto should have the second output which should be the
inverse of the above readings as far as I know. 4.8 V at the idle
position and 0.02 V full open.

You also can take an ohm meter and read it as the throttle opens. It
should change smoothly. If it is jerky, the coil inside the TPS is
dirty or bad.

On your 90, I think the TPS is adjustable for the bottom end or the .02
volts. There should be a capped screw like a mix screw on a carb.

I have been told you can actually clean the guts of the TPS, but haven't
needed to yet.

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)

JRK58@MSN.COM wrote:
>
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?

 

Your readings don't sound right to me...

With the engine off and the key on run, the AC off, you should see a
0.026 volts. When you open the throttle all the way, you should see 4.8
volts.

The TPS for the auto should have the second output which should be the
inverse of the above readings as far as I know. 4.8 V at the idle
position and 0.02 V full open.

You also can take an ohm meter and read it as the throttle opens. It
should change smoothly. If it is jerky, the coil inside the TPS is
dirty or bad.

On your 90, I think the TPS is adjustable for the bottom end or the .02
volts. There should be a capped screw like a mix screw on a carb.

I have been told you can actually clean the guts of the TPS, but haven't
needed to yet.

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)

JRK58@MSN.COM wrote:
>
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?

 

Your readings don't sound right to me...

With the engine off and the key on run, the AC off, you should see a
0.026 volts. When you open the throttle all the way, you should see 4.8
volts.

The TPS for the auto should have the second output which should be the
inverse of the above readings as far as I know. 4.8 V at the idle
position and 0.02 V full open.

You also can take an ohm meter and read it as the throttle opens. It
should change smoothly. If it is jerky, the coil inside the TPS is
dirty or bad.

On your 90, I think the TPS is adjustable for the bottom end or the .02
volts. There should be a capped screw like a mix screw on a carb.

I have been told you can actually clean the guts of the TPS, but haven't
needed to yet.

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)

JRK58@MSN.COM wrote:
>
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?

 

Your 90 I think has a RENIX system and the TPS is adjustable. Have you
adjusted it? Also as I recall the readings for a auto are different but I
don't remember for sure.

JoBo

<JRK58@MSN.COM> wrote in message
news:1143253208.556751.263640@i40g2000cwc.googlegr oups.com...
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?
>

 

Your 90 I think has a RENIX system and the TPS is adjustable. Have you
adjusted it? Also as I recall the readings for a auto are different but I
don't remember for sure.

JoBo

<JRK58@MSN.COM> wrote in message
news:1143253208.556751.263640@i40g2000cwc.googlegr oups.com...
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?
>

 

Your 90 I think has a RENIX system and the TPS is adjustable. Have you
adjusted it? Also as I recall the readings for a auto are different but I
don't remember for sure.

JoBo

<JRK58@MSN.COM> wrote in message
news:1143253208.556751.263640@i40g2000cwc.googlegr oups.com...
> Hello All, My XJ starting shifting weird the other day, sometimes it
> couldn't figure out what gear it wanted to be in and sometimes it
> wouldn't shift out of 2nd. The same thing happened 4 yrs ago and a new
> TPS fixed it.
> I cleaned connections and then replaced the TPS, it was fine for a day
> and then it acted up again and the idle was up to 2500
> I checked voltage at the square plug (to AT) and it is way off.
>
> Connection A (input) reads 4.32v should be aprx. 5v
> Connection B (output) reads .34 should be 82% of A or 3.5v
> Connection D (Ground) reads .8v should be less than .1v
>
> The one I replaced had a higher output of .5v
>
> Do you think the new one is bad already?
>

 

Hello, yes I adjusted it, it won't adjust near far enough to get a
proper reading. The readings from the AT plug are .35v at idle and .01v
wide open. The readings while opening throttle are smooth. The ground
reading of .8v has me thinking I should splice a ground to the circuit,
this was recommended in another post. I did check chassis to block
grounds and I did the old jumper cable check with no change in reading.
Thanks, JK