Camshaft Hall Sensor DDE 4.1

The camshaft Hall sensor is mounted on the rear left of the cylinder head. The camshaft features a rectangular lobe that moves past the Hall sensor. The DDE control unit evaluates the resulting voltage signal (one square-wave signal per camshaft revolution). This signal is used for synchronization purposes:

With the aid of the camshaft signal, when the engine is started, the DDE control unit determines whether there is an injection or a gas flow TDC and can thus activate the correct injector for fuel injection.

Engine start is not possible without synchronization!

Troubleshooting

The following faults are monitored:

• Signal frequency too high
  
• Signal failure
  

In both cases, fault code 1E25 "rpm sensor monitoring" is stored each with different types of faults.

Consequences:

• In case of failure during engine operation: No effect, however, the engine will not start during the next start attempt.