Camshaft Adjustment Valve 1 and Camshaft Adjustment Valve 1 (Exhaust), Checking
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) N208
Special tools, testers and auxiliary items 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.
- 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.
Procedure
- Remove the engine cover with air filter.
- Disconnect Camshaft Adjustment Valve 1 N205 electrical harness connector - 1 - or Camshaft Adjustment Valve 1 (exhaust) N208.
- Using a Multimeter , check the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N208 for resistance.
- Measure pin 1 pin 2 of the component.
Specified value: 5.0 to 8.0 Ohms (at approx. 20 degrees C)
If the specified value was not obtained:
- Replace the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 2 (exhaust) N208.
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 2 (exhaust) N208 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 terminal 87/2 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.
If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J623.
- Using a Multimeter , Check the Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 2 (exhaust) N208 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector for an open circuit.
Camshaft Adjustment Valve 1 Motronic Engine Control Module
N205 electrical harness (ECM) electrical harness connector
connector terminal T121 terminal or test box socket
2 115
Camshaft Adjustment Valve 2 Motronic Engine Control Module
(exhaust) N208 electrical (ECM) electrical harness connector
harness connector terminal T121 terminal or test box socket
2 120
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, 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) J623.
- Install the engine cover with air filter.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
End of diagnosis.