Throttle Position Sensor, Checking

Throttle Position Sensor, Checking

Special tools, testers and auxiliary items required
- Multimeter
- Wiring diagram

Test requirement
- The MFI Engine Control Module (ECM) J192 fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.

Note: Use only gold-plated terminals when servicing the electrical harness connector terminals in Throttle Position (TP) Sensor G69 .

Test procedure
- Perform a preliminary check to verify the customers complaint.

Start diagnosis
- Remove the engine cover.

Checking internal resistance
- Disconnect the Throttle Position (TP) Sensor G69 electrical harness connector.






- Using a multimeter, check the Throttle Position (TP) Sensor G69 terminals 1 to 2 for resistance.
Specified value: 1500 to 2600 Ohms
- Measure resistance between terminals 2 and 3
Specified value (closed throttle) 750 to 1300 Ohms

If the specification was not obtained:
- Replace the Throttle Position (TP) Sensor G69.

If the specification was obtained:

Checking voltage supply and wiring
- Switch the ignition on.






- Using a Multimeter, check the following wiring connections for voltage.






- Switch the ignition off.

If the specification was not obtained:

If the manufacturers test box is being used, perform the following step.

- Install the Adapter (96pin) OBD II VAG1598/19.

If the manufacturers test box is not being used, perform the following step.

- Remove the MFI Engine Control Module (ECM) J192.






- Using a Multimeter, check the Throttle Position (TP) Sensor G69 electrical harness connector terminals to the MFI Engine Control Module (ECM) J192 electrical connector for an open circuit.






Specified value: 1 Ohm max

If the specification is not obtained:
- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:
- Replace the Throttle Position (TP) Sensor G69.
- Erase the DTC memory.
- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, generate readiness code.

- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:
- Replace the MFI Engine Control Module (ECM) J192.
- Assembly is performed in the reverse of the removal.

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

End diagnosis.