Accelerator Pedal Position Sensor/Accelerator Pedal Position Sensor 2, Checking

Accelerator Pedal Position Sensor/Accelerator Pedal Position Sensor 2, Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

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.

• 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 procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Remove the drivers side storage compartment. Refer to the appropriate service manual.

- Disconnect the Accelerator pedal position sensor (G79) / Accelerator Pedal Position Sensor 2 (G185) 6-pin electrical harness connector - 4 -.






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 specified value was obtained:

- Replace the Accelerator pedal position sensor (G79) / Accelerator Pedal Position Sensor 2 (G185). Refer to the appropriate service manual.

- Go to Final procedures

If the specified value was Not obtained:

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate service manual.

- Using a Multimeter, check the Accelerator pedal position sensor (G79) / Accelerator Pedal Position Sensor 2 (G185) electrical harness connector terminals to the Motronic Engine Control Module (ECM) (J623) electrical connector T94 for an open circuit.











Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for a short circuit to each other, Battery voltage, and Ground (GND).

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate service manual.

Final procedures

- Reinstall the drivers side storage compartment. Refer to the appropriate service manual.

- After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.