TP Sensor/Accelerator Pedal Position Sensor 2, Checking
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram
Test requirement
- The Motronic Engine Control Module (ECM) J623 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 G79/Accelerator Pedal Position Sensor 2 G185.
Test sequence
- Remove the drivers side storage compartment. Refer to → 68 - INTERIOR EQUIPMENT .
- Disconnect the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector - 2 -.
Checking voltage supply and wiring
- Switch the ignition on.
- Using a Multimeter, check the following wiring connections for voltage.
| Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminal | Specified value |
|---|---|
| 1 to Ground (GND) | about 5 V |
| 1 to 5 | about 5 V |
| 2 to Ground (GND) | about 5 V |
| 2 to 3 | about 5 V |
- Switch the ignition off.
If the specification is not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box. Refer to → 24 - MULTIPORT FUEL INJECTION (MFI) .
If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623. Refer to → Engine Control Module, Removing and Installing .
- Using a Multimeter, check the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical connector T60 for an open circuit according to wiring diagram.
| Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals | Motronic Engine Control Module (ECM) J623 electrical connector T60 terminals or test box socket |
|---|---|
| 3 | 80 |
| 4 | 79 |
| 5 | 78 |
| 6 | 58 |
| 7 | 57 |
| 8 | 56 |
Specified value: 1.5 Ω 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, lose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. → 20 - FUEL SUPPLY .
If no malfunction is detected in the wiring and if the voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J623. Refer to → Engine Control Module, Removing and Installing .
Assembly is performed in the reverse order of removal.
- Install the drivers side storage compartment. Refer to → 68 - INTERIOR EQUIPMENT .
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory.
- If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
- If the DTC memory was erased, generate readiness code. Refer to Readiness Code .
- End of diagnosis.