CAMSHAFT ADJUSTMENT VALVE 1 N205, CHECKING
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuse -SB8- 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.
Disconnect Camshaft Adjustment Valve 1 -N205- electrical harness connector -1-.
Scheme 15
Using a Multimeter, check the Camshaft Adjustment Valve 1 -N205- for resistance.
Scheme 16
Specified value: 5.0 to 8.0 ohms (at approx. 20°C)
If the specified value was not obtained
Replace the Camshaft Adjustment Valve 1 -N205-.
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 Ground (GND) for voltage.
Switch the ignition off.
Scheme 17
Specified value: battery voltage.
If the specified value was not obtained
Check the Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal 1 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, 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 MOTRONIC ENGINE CONTROL MODULE J623, REPLACING .
Using a Multimeter, Check the Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector T60 terminal 20 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 | 20 |
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. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
Perform a road test to verify repair.
If the DTC does not return
Repair complete, Generate readiness code. Refer to READINESS CODE .
End diagnosis.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK
Replace the Motronic Engine Control Module (ECM) -J623-. Refer to MOTRONIC ENGINE CONTROL MODULE J623, REPLACING .
Assembly is performed in the reverse of the removal.
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-460545-S34924796122012032900000) .
- If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-460545-S22784966642012032900000) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-460545-S09921476902012032900000) .
End of diagnosis.