Cylinder Head Coolant Valve -N489-, Checking
General Description
Coolant flow is regulated by means of a mechanically coupled rotary slide valve. The angular position of the rotary slide valve is regulated according to various engine maps stored in the engine control unit. Various switching positions can be implemented by configuring the rotary slide valve accordingly. This allows rapid heating of the engine, which, in turn, results in lower friction and higher fuel economy.
Special Tools And Workshop Equipment Required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test Requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF All electrical and electronic accessories.
- Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
- Vehicles with Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Observe all safety precautions, refer to SAFETY PRECAUTIONS
.
- View clean working conditions, refer to CLEAN WORKING CONDITIONS
.
- For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS
.
Test Procedure
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK
.
-- Was Complaint verified? |
-- YES:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Cylinder Head Coolant Valve -N489- harness connector.
- CHECK: Cylinder Head Coolant Valve -N489- component connector terminals 1 to 2 for resistance.
- SPECIFIED VALUE: 9 - 14 Ω (@ approx. 20° C).
-- Was Value obtained? |
-- YES:
-- NO:
- REPLACE: Cylinder Head Coolant Valve -N489-. Refer to appropriate repair information.
- GO TO: Step 5
|
| 3 |
- IGNITION: ON.
- CHECK: Cylinder Head Coolant Valve -N489- harness connector terminal 2 to ground for battery voltage.
- IGNITION: OFF.
- SPECIFIED VALUE: Battery Voltage.
-- Was Value obtained? |
-- YES:
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 5
|
| 4 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Cylinder Head Coolant Valve -N489- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 48 for resistance.
- SPECIFIED VALUE:0.5 Ω (± 0.3 Ω).
-- Was Value obtained? |
-- YES:
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 5
|
| 5 |
- Final Procedure
- Perform a road test to verify repair.
-- Does the original DTC return? |
-- YES:
- CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
- Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODE
.
- Return vehicle to Customer.
-- NO:
- Perform the diagnostic procedure for any DTC's.
- If no DTC's return the repair is complete.
- Return vehicle to customer.
|