Intake Manifold Runner Position Sensor, Checking

Intake Manifold Runner Position Sensor, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Intake Manifold Runner Position Sensor (G336) fuse OK.

• TheEngine Component Power Supply Relay (J757) OK.

• The parking brake engaged.

• The battery voltage at least 12.5 V.

• The selector lever of automatic transmission in position "P" or "N".

• All electrical consumers switched off (radiator fan must NOT run during test).

• A/C switched off.

• The fuel tank at least 1/4 filled.

• The ignition switched off.

Test procedure

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

Start diagnosis

Procedure

- Remove the rear engine cover - arrows -.





• The Intake manifolds have been removed for clarity.

- Disconnect the Intake Manifold Runner Position Sensor (G336) electrical harness connector - 1 -.





Checking voltage supply

Switch the ignition on.

- Using a Multimeter, check the Intake Manifold Runner Position Sensor (G336) electrical harness connector for voltage.









Switch the ignition off.

If the specified values are obtained:

- Replace the Intake Manifold Runner Position Sensor (G336).

If the specified values are 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). Refer to => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

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









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.

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase 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. Refer to => [ 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 OK:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

The Intake Manifold Runner Position Sensor (G336) must be adapted to the Engine Control Module (ECM) (J623).

To adapt the Intake Manifold Runner Position Sensor (G336) to the Engine Control Module (ECM) (J623) perform the following steps:

• The battery voltage at least 12.5 V.

• Coolant temperature must be between 20° C and 80° C.

• No DTC's stored in DTC memory.

- Start the engine and let run at idle for at least 70 Seconds.

- The Engine Control Module (ECM) (J623) will automatically adapt the Intake Manifold Runner Position Sensor (G336).

- Assembly is performed in the reverse of the removal.

Final procedures

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

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

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

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