3.2.354. SPN 520386, FMI 8, ECU 2 Signal deviation between crankshaft and camshaft too largeΒΆ

Description

The repetition signals between the crankshaft and the camshaft deviates too much in the ECU 2. The synchronization between cam and the crankshaft could be invalid.

Possible causes are:

  • The repetition signal wirings are defective.
  • An external electromagnetic disturbance is affecting the repetition signal.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault. Engine power will be reduced (Degradation Level 2). The engine starting may take longer than normally, and running may be poor due to missing/incorrect information for the injection timing control. The engine runs with the camshaft speed sensor signal.

Solution

First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the crankshaft and the camshaft repetition wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).

The crank repetition signal pin numbers:

ECU 1   2.44 Output
ECU 2   2.66 Input

Also for correct repetition reference signal a jumper is needed between the ECU pins:

ECU 1   2.09
ECU 2   2.65

The cam repetition signal pin numbers:

ECU 1   2.43 Output
ECU 2   2.68 Input

Also for for correct cam repetition signal operation. A jumper is needed between the pins:

ECU 2   2.67
ECU 2   2.32
  • Look for possible electromagnetic noise sources on or close to the vehicle, which are disturbing the signal (devices using or carrying high currents, high voltages or strong magnetic fields).

See Camshaft speed sensor for reference.

See Crankshaft speed sensor for reference.