Electronic Throttle Actuator Position Sensor: Testing and Inspection

Throttle Drive Angle Sensors, Checking

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

Test requirement
- The Motronic Engine Control Module (ECM) J220 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 Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G1871 Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188.

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







- Release the tabs - arrows - and remove the steering column cover.

Start diagnosis







- Disconnect the Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187 / Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188 electrical harness connector - 2 -.

Checking voltage supply and wiring
- Switch the ignition on.







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

Throttle Drive Angle Specified
Sensor 1 (for Electronic value
Power Control (EPC))
G187 / Throttle Drive Angle
Sensor 2 (for Electronic
Power Control (EPC)) G188
electrical harness connector
terminal
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:

If the manufacturers test box is being used. Perform the following step.
- Install the test box VAG1598/31.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.







- Using a Multimeter, check the Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187 / Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical connector for resistance.

Throttle Drive Angle Sensor 1 Motronic Engine Control Module (ECM)
(for Electronic Power Control J220 electrical harness connector
(EPC)) G187 / Throttle Drive terminals or test box socket
Angle Sensor 2 (for Electronic
Power Control (EPC)) G188
electrical harness connector
terminals
1 92
2 83
3 117
4 84
5 118
6 91

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 the voltage supply was OK:
- Replace the Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187 / Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188.

If no malfunction is detected in the wiring and if the voltage supply was not OK:
- Erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Readiness Code
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J220.
- Assembly is performed in the reverse of the removal.

Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

End of diagnosis