Camshaft Adjustment Valve 1 -N205-, CHECKING
General Description
The variable valve timing system allows displacement in a uniform direction of the valve timing of all the valves driven by each camshaft. Therefore, the size and position of the valve overlap on engines with two overhead camshafts can be changed and adjusted to the individual gas exchange rate, thereby improving the operating characteristics at part load and full load. The camshaft adjustment monitor continuously checks whether the camshaft position reaches the setpoint value within a defined time period following an adjustment request. A distinction is made between two fault types: "camshaft adjustment too slow" and "camshaft adjustment, setpoint value not attained". This way, the monitor can detect a camshaft actuator that is blocked or responding too slowly.
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: SAFETY PRECAUTIONS
.
- View clean working conditions: CLEAN WORKING CONDITIONS
.
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: Camshaft Adjustment Valve 1 -N205- harness connector.
- CHECK: Camshaft Adjustment Valve 1 -N205- component connector terminals 1 to 2 for resistance.
- SPECIFIED VALUE: 5 - 20 Ω (+/- 3 Ω @ approx. 20° C).
-- Was Value obtained? |
-- YES:
-- NO:
- REPLACE: Camshaft Adjustment Valve 1 -N205-. Refer to appropriate repair manual.
- GO TO: Step 5.
|
| 3 |
- IGNITION: ON.
- CHECK: Camshaft Adjustment Valve 1 -N205- harness connector terminal 1 to ground for voltage.
- SPECIFIED VALUE: Battery voltage.
- IGNITION: OFF.
-- 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 manual.
- CHECK: Camshaft Adjustment Valve 1 -N205- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / 105 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.
- Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODES
.
- Return vehicle to Customer.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair manual.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODES
.
- 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.
|