Operation CHARM: Car repair manuals for everyone.

Throttle Position Sensor/Accelerator Pedal Position Sensor 2, Checking







Throttle 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 information.

- Disconnect the Throttle Position (TP) Sensor (G79)/Accelerator Pedal Position Sensor 2 (G185) 6-pin electrical harness connector - 2 -.





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 test box.

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

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

- 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 T94 for an open circuit.









Specified value: 1.5 ohms 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 (G79)/Accelerator Pedal Position Sensor 2 (G185). Refer to the appropriate service information.

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 the appropriate service information.

- Install the drivers side storage compartment. Refer to the appropriate service information.

Final procedures

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 ] Monitors, Trips, Drive Cycles and Readiness Codes.