Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336 , Checking

Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336, Checking

Test requirements

Special tools, testers and auxiliary items required
- Multimeter V.A.G 1526 or equivalent.
- Test Box 105 Pin VAG1598/42.
- Adapter Lead Vag1598/39 VAG1598/39.
- Adapter cable V.A.G 1598/39-1.
- Fuses of Motronic Engine Control Module (ECM) J220 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.
- Ignition switched off.

Test sequence







- Remove engine cover - arrows -.







- Disconnect the electrical harness connector - arrow - from the Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336.
- Switch ignition on.







- Using multimeter V.A.G 1526 B or equivalent, check electrical connector terminals 1+3 for voltage.
- Specified value: about 5 V
- Switch ignition off.

If the specified value is not obtained:
- Replace Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336.

If the specified value is obtained:
- Connect the test box 1598/42 to the wiring harness of the Engine Control Module (ECM) J623.
- Using the Test Box 105 Pin VAG1598/42 and Multimeter V.A.G 1526 A or equivalent, check the following wiring connection for an open circuit.

Terminal Test box socket
1 37
2 22
3 14
4 49
5 34

Specified resistance 1.5 Ohms max.

If the specification is not obtained:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:
- Replace the Engine Control Module (ECM) J623.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

- End diagnosis and switch the ignition off.