111 Crankshaft Position Sensor - Not In Specified Range

P1579

111 Crankshaft Position Sensor - Not in Specified Range

Function
To precisely determine the crankshaft position, a reference mark signal is required.

Engine speed and reference mark are monitored via an inductive sensor. A larger gear notch in the ring gear serves as reference mark. The larger notch induces a higher voltage in the sensor.

A soft iron core partially bundles the magnetic field produced by the permanent magnet which then enters the space and closes again through the magnetically conductive parts of the engine. A steel toothed ring moving past the face of the sensor affects the magnetic field. The change in the magnetic field induces an electric charge in the coil winding which is used by the DME control module.










Diagnosis conditions
- Engine running

P0336:

Wiring Diagram







NOTE:
- The distance of the sensor is not adjustable.
- The steel toothed ring is stamped from sheet steel. Take great care when installing and removing the flywheel, because force acting on the steel toothed ring can deform it, leading to a defective signal.

Diagnosis Procedure







1 Check signal with engine tester.







1. Connect special tool 9637.
2. Connect engine tester. Using special input, connect positive cable to pin III/32, negative cable to pin III/46.
3. Start engine or crank engine with starter motor.

The display pictured opposite should appear on the oscilloscope:

2 Check wiring from crankshaft position sensor to DME control module for open circuit and short circuit.
1. Connect special tool 9637 to wiring harness.
2. Remove connector from crankshaft position sensor.
3. Connect ohmmeter to special tool 9637, pin III/32, and connector, pin 1.

Display: 0 - 5 ohms

4. Connect ohmmeter to special tool 9637, pin III/46, and connector, pin 2.

Display: 0 - 5 ohms

5. Connect ohmmeter to special tool 9637, pin III/45, and connector, pin 3.

Display: 0 - 5 ohms

6. Connect ohmmeter to special tool 9637, pins III/32 and III/45.

Display: infinity ohms

3 Perform adaptation.
1. Switch on the ignition.
2. Wait one minute. Do not press the accelerator.
3. Switch off the ignition for at least 10 seconds.
4. Read out the fault memory.