Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 , checking (Engine Code AMB)
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 Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.
Test sequence
- Remove the drivers side storage compartment. Refer to →
- 68 - INTERIOR EQUIPMENT
- 68 - INTERIOR EQUIPMENT for BODY INTERIOR - CABRIOLET
- 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.
| Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals | 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 was not obtained:
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) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .
- 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) J220 electrical connector for an open circuit.
| Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals | Motronic Engine Control Module (ECM) J220 electrical connector test box sockets |
|---|---|
| 1 | 72 |
| 2 | 73 |
| 3 | 36 |
| 4 | 35 |
| 5 | 33 |
| 6 | 34 |
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 if the voltage supply was OK:
- Replace the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. → 20 - FUEL SUPPLY SYSTEM .
If no malfunction is detected in the wiring and if the voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .
- Install the drivers side storage compartment. Refer to →
- 68 - INTERIOR EQUIPMENT
- 68 - INTERIOR EQUIPMENT for BODY INTERIOR - CABRIOLET
Final procedures
After the 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.