So I am tired of throwing parts at this, but I am also tired of it not being fixed.
2000 XJ Sport 4.0L 4x4 AW4 NP231 D35 front Cry 8.25 rear
ISSUE: 0122 code (TPS low voltage)
PRESENTATION: low and rough idle, dies after release of throttle, RPMs drop out rather than stagger down when throttle is released, CEL, TPS shows 0% or 100% in Torque App
STEPS TAKEN:
1) Checked connections to both IAC and TPS. Cleaned and reseated both connections. Reseated the connectors to the PCM, and reseated the PCM itself to ensure proper grounding - no change
2) Replaced IAC (it was dirty, had been cleaned once before by me years ago, and the spring action was janky - should be able to get another 200k from this one) - rough idle gone, low idle and CEL persists
3) Replaced TPS - no change
4) Tested new and old TPS using a safety pin on the back of the connector - Voltage is correct on source, variable voltage within tolerance with no spikes or drops, ground connection good, tested while taping on connector and while wiggling the cables, no changes in test results.
5) Pulled horn relay (W.A.G. from reading another kinda related post) - CEL off and idle upto 650-700, Torque shows TPS at ~15% at idle
** 0122 code shows as pending in Torque, but the CEL does not light at this point **
6) Replaced clock spring with NEW part (old one was scrounged from junk yard) - no change.
NEXT STEPS:
This is where I am stumped. I could entertain the possibility of there being a wiring issue, except for the successful tests of the TPS. I could entertain the possibility of the computer being the issue, except that its just this one code, and reseating the computer and the connectors had no change.
I am perplexed as to what could be the issue here. At least the rough and low idle have been resolved, but when its time for this to go for emissions tests, I wont pass because of the stored code. Also, I'm hesitant to take it on trails because if something changes, I could be stuck, whereas if I am in town, I can make a phone call.
Any ideas and suggestions are welcome. I'll entertain just about anything short of burning it to the ground or hitting it with my purse!
Thanks!
2000 XJ Sport 4.0L 4x4 AW4 NP231 D35 front Cry 8.25 rear
ISSUE: 0122 code (TPS low voltage)
PRESENTATION: low and rough idle, dies after release of throttle, RPMs drop out rather than stagger down when throttle is released, CEL, TPS shows 0% or 100% in Torque App
STEPS TAKEN:
1) Checked connections to both IAC and TPS. Cleaned and reseated both connections. Reseated the connectors to the PCM, and reseated the PCM itself to ensure proper grounding - no change
2) Replaced IAC (it was dirty, had been cleaned once before by me years ago, and the spring action was janky - should be able to get another 200k from this one) - rough idle gone, low idle and CEL persists
3) Replaced TPS - no change
4) Tested new and old TPS using a safety pin on the back of the connector - Voltage is correct on source, variable voltage within tolerance with no spikes or drops, ground connection good, tested while taping on connector and while wiggling the cables, no changes in test results.
5) Pulled horn relay (W.A.G. from reading another kinda related post) - CEL off and idle upto 650-700, Torque shows TPS at ~15% at idle
** 0122 code shows as pending in Torque, but the CEL does not light at this point **
6) Replaced clock spring with NEW part (old one was scrounged from junk yard) - no change.
NEXT STEPS:
This is where I am stumped. I could entertain the possibility of there being a wiring issue, except for the successful tests of the TPS. I could entertain the possibility of the computer being the issue, except that its just this one code, and reseating the computer and the connectors had no change.
I am perplexed as to what could be the issue here. At least the rough and low idle have been resolved, but when its time for this to go for emissions tests, I wont pass because of the stored code. Also, I'm hesitant to take it on trails because if something changes, I could be stuck, whereas if I am in town, I can make a phone call.
Any ideas and suggestions are welcome. I'll entertain just about anything short of burning it to the ground or hitting it with my purse!
Thanks!
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