Testing tps
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.
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 it's 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.
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 it's 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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