Camshaft Adjustment Valve 1 And Camshaft Adjustment Valve 1, Exhaust, Checking
The following procedure is used to diagnose both Camshaft Adjustment Valve 1 -N205- and Camshaft Adjustment Valve 1 (exhaust) -N318-
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, checking appropriate SYSTEM WIRING DIAGRAM.
- 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 GENERAL DIAGNOSIS .
Start diagnosis
-- Remove the engine cover with air filter.
-- Disconnect Camshaft Adjustment Valve 1 -N205- electrical harness connector -1- or Camshaft Adjustment Valve 1 (exhaust) -N318-.
-- Using a Multimeter, check the Camshaft Adjustment Valve 1 -N205- or Camshaft Adjustment Valve 1 (exhaust) -N318- for resistance.
Specified value: 5.0 to 8.0 Ω (at approx. 20° C)
If the specified value was not obtained:
-- Replace the Camshaft Adjustment Valve 1 -N205- or Camshaft Adjustment Valve 1 (exhaust) -N318-.
If the specified value was obtained:
Checking voltage
-- Switch the ignition on.
-- Using a Multimeter, Check the Camshaft Adjustment Valve 1 -N205- or Camshaft Adjustment Valve 1 (exhaust) -N318- electrical harness connector terminal to the Motronic Engine Control Module (ECM) Power Supply Relay -J271- terminal 2/87 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 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 Repair information.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .
-- Using a Multimeter, Check the Camshaft Adjustment Valve 1 -N205- or Camshaft Adjustment Valve 1 (exhaust) -N318- electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector for an open circuit.
| Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal | Motronic Engine Control Module (ECM) electrical harness connector T121 terminal or test box socket |
|---|---|
| 2 | 115 |
| Camshaft Adjustment Valve 1 (exhaust) -N318- electrical harness connector terminal | Motronic Engine Control Module (ECM) electrical harness connector T121 terminal or test box socket |
|---|---|
| 2 | 120 |
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) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .
-- Install the engine cover with air filter.
Final procedures
After 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 .
-- End of diagnosis.