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

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

The Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336 are one component and cannot be serviced separately.

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

Test requirements
- 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.
- Ignition switched off.

Test procedure
- Perform a preliminary check to verify the customers complaint. Preliminary Check

Start diagnosis
- Remove the engine cover with air filter.







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







- Using a multimeter, check the Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336 electrical harness connector terminals 1 to 3 for voltage.
- Specified value: about 5 V
- Switch ignition off.

If the specified value was obtained:
- Replace the Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336.

If the specified value was not obtained:

Checking wiring
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.







- Using a Multimeter, check the Intake Flap Motor V157 / Intake Manifold Runner Position Sensor G336 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60 terminals for an open circuit.

Intake Flap Motor V157 / Intake Motronic Engine Control Module
Manifold Runner Position Sensor (ECM) J623 electrical harness
G336 electrical harness connector connector T60 terminals or test
terminals box sockets
1 37
2 22
3 14
4 49
5 34

Specified value: 1.5 Ohms Max.

If the specification was 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:
- 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. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J623
- Assembly is performed in the reverse of the removal.

Final Procedures
After the 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. Monitors, Trips, Drive Cycles and Readiness Codes

End of diagnosis.