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 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 Repair Manual.
-- 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 Ω (at approx. 20° C)
If the specified value was Not obtained:
-- Replace the Camshaft Adjustment Valve 1 -N205-. Refer to the Repair Manual.
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.
-- 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 Repair Manual.
-- 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 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, 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 Repair Manual.
-- Install the engine cover with air filter. Refer to the Repair Manual.
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 .