newbie with renix question

[oldrusty]

I with a have a 89 pioneer with a 4.0 and a 5 spd with a problem... It started out as what seemed like a stumble whenever you tried to lug the motor down on a pull. I started out checking for vaccum leaks and loose electrical connectors. Next i cleaned the Iac solenoid and throttle body... Figured since i was there I might as well adjust the tps to.... here's my problem.... I have the correct input voltage of 5 volts, but when I check the output with the butterfly closed I have an output of 4.2 volts( my book says it should be .8 volts). My local napa wants about $90.00 for a new tps so Id like to know 4 sure if mine is bad b4 I order a new one.....thanks :dunno:

[BLHTAZ]

If you are comfotable with the fact that you are doing the test properly, then it sounds like a bad TPS to me. Just double check everything and be sure that you are connected to the proper positions when testing.

 

When you say "my book"...is it a FSM?

[oldrusty]

What I have is a few pages the po printed off the internet. I know I'm checking across the proper terminals according to the material I have for a reference. What is confusing me is that according to this an auto tranny should have an output of 4.2 volts (which is what I'm reading), but a manual trans (what mine is) should read .8 volts.

[BLHTAZ]

If you want to download the complete Renix FSM, I posted it in the DIY forum here... viewtopic.php?f=9&t=12517

 

 

Here is a snip from the FSM on how to test the TPS so you can double check that it matches what you are looking at / doing...

 

THROTTLE POSITION SENSOR (TPS)

 

1) Turn ignition on. Check throttle position sensor input

voltage. Connect voltmeter negative lead to terminal "B" (M/T), or

terminal "D" (A/T) of sensor connector. Connect voltmeter positive

lead to terminal "C" (M/T), or terminal "A" (A/T) of sensor connector.

 

NOTE: On (A/T) models, connector terminals are identified by

letters molded into back of connector. On all models, do not

disconnect TPS harness connector. Insert voltmeter test

leads through back of wire harness connector. On some

models, it may be necessary to remove throttle body from

intake manifold to gain access to sensor wire harness.

 

2) Move and hold throttle plate at wide open throttle

position (M/T), or close throttle plate completely (A/T). Ensure

throttle linkage contacts stop. Note voltmeter reading. Input voltage

at terminals "B" and "C" (M/T), or terminals "A" and "D" (A/T) should

be 5 volts.

 

3) Return throttle plate to closed throttle position (M/T),

or maintain throttle plate in closed position (A/T). Check sensor

output voltage. To do so, disconnect voltmeter positive lead from

terminal "C" and connect it to terminal "A" (top) of sensor (M/T), or

from terminal "A" and connect it to terminal "B" (A/T).

 

4) Move and hold throttle plate in wide open throttle

position (M/T), or maintain throttle plate in closed position (A/T).

Ensure throttle linkage contacts stop. Note voltmeter reading. Output

voltage should be 4.6-4.7 volts (M/T), or .2 volt (A/T).

 

5) If output voltage is incorrect, loosen bottom sensor

retaining screw and pivot sensor in adjustment slot for a coarse

adjustment. Loosen top sensor retaining

[oldrusty]

thanks.......I'll get back on it tomorrow this time with the correct info :bowdown:

[BLHTAZ]

:cheers: We'll be waiting to hear...