Camshaft Hall sensor DDE

The camshaft Hall sensor is mounted on the housing of the vacuum pump. A rectangular lobe which moves past the Hall-effect sensor is located on the drive gear of the camshaft. The DDE control module 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 module 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
  

Consequences:

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