Turbocharger Recirculating Valve, Checking

Turbocharger Recirculating Valve, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The 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.

• On vehicles with automatic transmission, selector lever in 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

- Lift the vehicle on a hoist to access the turbocharger recirculating valve connector.

Checking internal resistance

- Disconnect the Turbocharger Recirculating Valve (N249) electrical harness connector.

- Using a multimeter, check the Turbocharger Recirculating Valve (N249) terminals 1 to 2 for resistance.

Specified value: 13.6 ohms +/- 5 ohms

If the specified value was Not obtained:

- Replace the Turbocharger Recirculating Valve (N249) Refer to the Repair Information.

If the specified value was obtained:

Checking Voltage supply

- Using a multimeter, check the Turbocharger Recirculating Valve (N249) electrical harness connector terminal 1 to engine ground.

- Start the engine.

Specified value: Battery voltage.

- Switch the ignition OFF.

If the specified value was Not obtained:

- Check the wiring for an open, short circuit to each other, high resistance or short to ground through fuse in Fuse Box B. Refer to Wiring Diagrams.

- Check fuse for open and replace if blown.

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

- If necessary, repair the wiring connection.

If the specified value was obtained:

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Using a multimeter, check the Turbocharger Recirculating Valve (N249) electrical harness connector terminal to Engine Control Module (ECM) (J623) electrical harness connector T60 terminal for an open circuit. Refer to the chart below.






Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for an open or high resistance.

- 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 and if the voltage supply was OK:

- Replace the 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 ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

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