Camshaft Adjustment Valve 1
The following procedure is used to diagnose Camshaft Adjustment Valve 1 N205 which is controlled by Motronic Engine Control Module (ECM) J623.
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuse SC8 OK.
- Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
- 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.
Procedure
- Disconnect the Camshaft Adjustment Valve 1 N205 electrical harness connector - 2 -
Checking internal resistance
- Using a Multimeter, check the Camshaft Adjustment Valve 1 N205 terminals 1 to 2 for resistance.
Specified value: 5.0 to 8.0 Ω (at approx. 20 C)
If the specified value was not obtained:
- Replace Camshaft Adjustment Valve 1 N205. Refer to → .
If the specified value was obtained:
Checking voltage
- Switch the ignition on.
- Using a Multimeter, Check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 2 to Ground (GND) for voltage.
- Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
- Check the wiring connection from the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
- Check the wiring connection for damage, corrosion, lose 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. Refer to → .
If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623. Refer to → .
- Using a Multimeter, check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.
| Camshaft Adjustment Valve 1 N205 electrical harness connector terminal | Motronic Engine Control Module (ECM) J623 electrical harness connector T60a terminal or test box socket |
|---|---|
| 1 | 20 |
Specified value: 1.5 Ω 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, lose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J623. Refer to → .
- Assembly is performed in the reverse order of removal.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the 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 .
- End of diagnosis.