CAMSHAFT ADJUSTMENT VALVE 1, CHECKING
Special tools and workshop equipment required
- multimeter.
- Wiring diagram.
Test requirements
- The Camshaft Adjustment Valve 1 -N205- fuse 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.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
Remove the engine cover with air filter. Refer to the appropriate service information.
Scheme 56
Disconnect Camshaft Adjustment Valve 1 -N205- electrical harness connector -1-.
Using a multimeter, check the terminals of the Camshaft Adjustment Valve 1 -N205- for resistance.
Specified value: 5.0 to 9.0 ohms (at approx. 20° C)
If the specified value was Not obtained
Replace the Camshaft Adjustment Valve 1 -N205-. Refer to the appropriate service information.
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 1 to engine ground 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 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-. Refer to the appropriate service information.
Using a multimeter, Check the Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal to the Motronic Engine Control Module (ECM) electrical harness connector T60 for an open circuit.
| Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal | Motronic Engine Control Module (ECM) electrical harness connector T60 terminal or test box socket |
|---|---|
| 2 | 60 |
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.
If the specified value was obtained
Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the appropriate service information.
Install the engine cover with air filter. Refer to the appropriate 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»(ref-479546-S27711938632012061300000) .
- If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-479546-S40908393152012061300000) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-479546-S40511231242012061300000) .