TPS and O2?
Tps- look up "TPS adjustment 101" in the search ,but that only tells you how inside the car, while running. I don't know how to test it out of the car..As for o2 i have never tested one i just replace them they aren't really expensive and should be regularly replaced anyways.....
1.3L is not that small
Joined: Apr 2002
Posts: 1,470
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From: Nacogdoches Tx
Originally posted by SureShot
Using test lights or voltage at idle readings will get your idle setting done, but may not show a worn out TPS resistor.
Try this:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
The reason is because as the TPS wears, it can give non-linear or inconsistent signals to the ECU.
You can see this as you work the TPS plunger in & out, the meter needle should swing smoothly from ~0 to ~5K ohms.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
Using test lights or voltage at idle readings will get your idle setting done, but may not show a worn out TPS resistor.
Try this:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
The reason is because as the TPS wears, it can give non-linear or inconsistent signals to the ECU.
You can see this as you work the TPS plunger in & out, the meter needle should swing smoothly from ~0 to ~5K ohms.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
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LongDuck
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Oct 7, 2015 08:12 PM