Camshaft Adjustment Valve 1 N205, Checking
Camshaft Adjustment Valve 1 N205, Checking
The following procedure is used to diagnose both Camshaft Adjustment Valve 1 N205 and Camshaft Adjustment Valve 1 (exhaust) N318
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.
Test requirements
- The Camshaft Adjustment Valve 1 N205 and Camshaft Adjustment Valve 1 (exhaust) N318 fuse OK.
- Motronic Engine Control Module (ECM) Power Supply Relay J271 OK, checking.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure
- Perform a preliminary check to verify the customers complaint. Preliminary Check
Start diagnosis
Procedure
- Remove the engine cover with air filter.
- Disconnect Camshaft Adjustment Valve 1 N205 electrical harness connector - 1 - or Camshaft Adjustment Valve 1 (exhaust) N318.
- Using a Multimeter, check the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N318 for resistance.
- Measure pin 1 pin 2 of the component.
Specified value: 5.0 to 8.0 Ohms (at approx. 20 degrees C)
If the specified value was not obtained:
- Replace the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N318.
If the specified value was obtained:
Checking voltage
- Switch the ignition on.
- Using a Multimeter, Check the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 terminal 87 for voltage.
- Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
- Check the wiring connection for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.
If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623.
- Using a Multimeter, Check the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector for an open circuit.
Camshaft Adjustment Valve 1 Motronic Engine Control Module
N205 electrical harness (ECM) electrical harness connector
connector terminal T60 terminal or test box socket
2 20
Camshaft Adjustment Valve 1 Motronic Engine Control Module
exhaust) N318 electrical (ECM) electrical harness
harness connector terminal connector T60 terminal or test box socket
2 21
Specified value: 1.5 Ohms Max.
If the specified value was not obtained:
- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
- Check the wiring connection for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.
- Erase the DTC memory. Diagnostic Modes 01 - 09
- Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J623.
- Assembly is performed in the reverse of the removal.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory. Diagnostic Modes 01 - 09
2. If necessary, erase the DTC memory. Diagnostic Modes 01 - 09
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
End of Diagnosis