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- 2 -.

- 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 Informatiom.

If the specified value was obtained:

Checking Voltage supply

- Turn the ignition switch On.

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

Specified value: Battery voltage.

- Switch the ignition OFF.

If the specified value was Not obtained:

- Check the wiring from the turbocharger recirculating valve connector to fuse SB 23 for an open, short to ground or high resistance.

- If necessary, repair the faulty wiring connection.

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

If the specified value was obtained:

- Check the Turbocharger Recirculating Valve (N249) electrical harness connector terminal 2 to engine ground.

Specified value: Near 3.55 V.

- Switch the ignition OFF.

If the specified values were obtained:

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

If the specified values were Not obtained:

Checking wiring

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

- 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 resistance. Refer to the chart below.






Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for an open, short 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 battery voltage was present:

- Replace the Engine Control Module (ECM) (J623). Refer to the Repair Informatiom.

- Install the engine cover with air filter. Refer to the Repair Informatiom.

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.