Crankshaft Position/RPM Sensor DDE 4.0

The inductive rpm sensor is screwed into the side of the engine block. A sensor gear with 58 teeth (60 teeth with a gap of 2 teeth) that moves past the rpm sensor is mounted on the crankshaft. The DDE control unit evaluates the resulting voltage signals for the purpose of calculating the engine speed.

The rpm sensor signal is used as a measurement variable for:

• Exhaust gas recirculation
  
• Checking start conditions
  
• Calculating start volume
  
• Start of injection control
  
• Checking switch-on conditions for air conditioning system
  
• Calculating limitation volume
  
• Calculating external delivery rate intervention
  
• Boost pressure control
  
• Injection rate control
  
• Rail pressure control
  
• Idle speed control
  

Troubleshooting

The following faults are monitored:

Fault code 0335 "Crankshaft position/rpm sensor"

• Overspeed recognition (engine overspeed)
  
• Signal dynamically implausible
  

Fault code 1E25 "rpm sensor monitoring"

• Failure of rpm sensor signal, crankshaft
  
• Signal dynamically implausible
  

Consequence:

• Engine shuts down