Intake Manifold Runner Position Sensor, Checking

Diagnostic Procedures

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 connections between engine/transmission/chassis OK.

• Ignition switched off.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Remove the engine cover with air filter. Refer to the repair information.

- Disconnect the Intake Manifold Runner Position Sensor (G336) electrical harness connector - arrow -.





- Switch the ignition ON.

- Using a multimeter, check the Intake Manifold Runner Position Sensor (G336) electrical harness connector terminal 1 to ground for voltage.





Specified value: near 5 V

- Switch ignition OFF.

If the specified values were obtained:

- Using a multimeter, connect the black lead to terminal 3 and the red lead to Battery positive.

Specified value: Battery voltage.

If the specified values were Not obtained:

- Check the wiring for an open, high resistance or short to ground.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If the specified values were obtained:

Checking internal resistance

- Using a multimeter, check the Intake Manifold Runner Position Sensor (G336) electrical terminals 2 to 3 for resistance.

Specified value: 7-25 ohms (at approx. 20° C)

- Using a multimeter, check the Intake Manifold Runner Position Sensor (G336) electrical terminals 1 to 3 for resistance.

Specified value: 204 - 284 ohms (at approx. 20° C)

If the specified values were Not obtained:

- Make sure the Intake Flap Motor ( V157) is not stuck. If the flap is OK, replace the Intake Manifold Runner Position Sensor (G336). Refer to appropriate service information.

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). Refer to the repair information.

- Using a multimeter, check the 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.





Specified value: 1.5 ohms Max.

If the specified values were Not obtained:

- Check the wiring for an open, high resistance or short to ground.

- 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:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to the repair information.

- Install the engine cover with air filter. Refer to the repair information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Scan Tool Testing and Procedures.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Scan Tool Testing and Procedures.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.