Variable Induction Control Valve: Testing and Inspection

Intake Flap Motor And Intake Manifold Runner Position Sensor, Checking

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 105 Pin VAG1598/42..

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 resistance.

Intake Flap MotorV157 / Motronic Engine Control Module
Intake Manifold Runner (ECM) J623 electrical connector
Position Sensor G336 electrical T60 terminals or test box socket
harness connector terminals
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 an open circuit, 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. Readiness Code, Setting
- End of 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) J623.
- Install the engine cover with air filter.

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. Readiness Code, Setting