Turbocharger Recirculating Valve Checking
Special tools and workshop equipment 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
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 Ω +/- 5 ohms (at room temperature)
If the specified value was Not obtained:
-- Replace the Turbocharger Recirculating Valve -N249-. Refer to the Repair service 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.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring connection and replace fuse if blown.
If no malfunctions are found in the wiring:
Checking wiring
-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair service information.
-- Using a multimeter, check the Turbocharger Recirculating Valve -N249- electrical harness connector terminal to Engine Control Module (ECM) -J623- electrical harness connector T105 for an open circuit.
| Turbocharger Recirculating Valve -N249- electrical harness connector terminal: | Engine Control Module (ECM) -J623- electrical connector T105 terminal: |
|---|---|
| 2 | 66 |
Specified value: 1.5 Ω 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 resistance and voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair service information.
-- Install the engine cover with air filter. Refer to the Repair service information.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .