Camshaft Adjustment Valve 1, Checking
Special tools and workshop equipment required
- Multimeter
- wiring diagrams
Test requirements
- Fuse for Camshaft Adjustment Valve 1 -N205- 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
-- Pull engine cover out of first mount at front arrow 1, then at right rear arrow 2 and finally at left rear arrow 3.
-- Disconnect the electrical harness connector -1- from Camshaft Adjustment Valve 1 -N205-.
-- Using a Multimeter, check the Camshaft Adjustment Valve 1 -N205- for resistance at the component terminals.
Specified value: 5.0 to 8.0 Ω (at approx. 20°C)
If the specification is not obtained:
-- Replace Camshaft Adjustment Valve 1 -N205-. Refer to VALVE SHAFT SEALS
If the specification is obtained:
-- Using a Multimeter, check the following wiring connection for an open circuit.
| Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal | Motronic Engine Control Module (ECM) -J623- electrical connector T121 terminal or test box socket |
|---|---|
| 2 | 115 |
| 1 | Fuse 24 (On fuse panel B) |
Specified resistance 1.5 Ω max.
If the specification is not obtained:
-- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
-- If necessary, repair the 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 OK:
-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to MOTRONIC ENGINE CONTROL MODULE, 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 .
- 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, SETTING .
End of Diagnosis.