178 Camshaft Adjustment, Bank 2 - Signal Implausible

P1325

178 Camshaft Adjustment, Bank 2 - Signal Implausible

Function
In order to increase torque and improve cylinder charging, the engine is equipped with two VarioCam actuators that are incorporated in the camshaft chain tensioners.
The actuators change the position of the inlet camshafts with respect to the outlet camshafts.
The position of the inlet camshafts is checked by the camshaft position sensors.

Diagnosis conditions
- Time elapsed after start-up > 200 sec.
- Engine oil temperature > 60 °C
- Engine speed between 600 rpm and 4520 rpm
- No fault with reference mark, camshaft position sensors and engine oil temperature

P1325:

Wiring Diagram







Diagnosis Procedure










1 Check triggering wire for short to ground.
1. Connect special tool 9637 to wiring harness (DME control module connector).







2. Remove connector of actuator.
3. Connect ohmmeter to pin V/3 and ground.

Display: infinity ohms

2 Check B+ supply of actuator.
1. Remove connector of actuator.
2. Connect voltmeter to connector, pin 1, and ground.

Switch on the ignition.
Display: battery voltage

3 Check triggering wire for continuity.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector of actuator.
3. Connect ohmmeter to special tool 9637, pin V/3, and connector, pin 2.

Display: 0 - 5 ohms

NOTE: The wire is routed via connector X 59/1.