Cummins ISX CM870 (2003-06) Fault Code: 778 PID: S64 SPN: 723 FMI: 2/2 Engine Camshaft Speed / Position Sensor – Data Erratic, Intermittent, or Incorrect.? The ECM has detected a loss of signal from the camshaft position sensor.
This fault is logged when the ECM does not receive a valid camshaft position signal.
Possible repairs:
1)Open or short circuit of the +5 volt supply, signal, or return wire in the engine harness
2)Damaged or failed camshaft position sensor.
Possible repairs:
1)Replace the engine wiring harness.
2)Replace the camshaft position sensor.
3)Inspect the camshaft tone wheel/gear teeth for damage or spinning.
4)Replace the ECM.
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