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Home >> BMW >> 2009 >> 550i Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Theory & Operation (N62) >> 1.13 Camshaft and Crankshaft Sensor including Valve Timing >> 1.13.6 Monitoring function - CAN communication

1.13.6 Monitoring function - CAN communication

P1035/P1038, P1036/P1039, P1037/P1040 

VVL control unit uses the CAN bus as communication device. The CAN messages DME_VVL_1, DME_VVL_2, DME_ALL_1 must be sent by the ECU to the VVL control unit at a fixed time rate. Missing reception of CAN messages are detected with timeout counters. CAN message DME_ALL_1 must contain a signal which is altered at every communication (alive counter). An unchanged alive signal is detected by a plausibility check.

Error Symptoms:

ERROR SYMPTOMS CHART

timeout DME_VVL_1 P1035, P1038
timeout DME_VVL_2 P1036, P1039
plausibility check alive counter P1037, P1040
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