11. Can C Bus (-) Circuit Open From Cab To Pcm

With the ignition off.

Disconnect the CAB harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the CAN C BUS (-) circuit from the CAB harness connector to the PCM C4 harness connector.

Fig 1: Measuring Resistance Of CAN C BUS- Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Is the resistance below 5.0 ohms?

Yes >> Repair the CAN C BUS (+) circuit for an open between the PCM C4 harness and the CAB harness connector.
See POWERTRAIN VERIFICATION TEST - VER 2 .
No >> Repair the CAN C BUS (-) circuit for an open between the PCM C4 harness and the CAB harness connector.
See POWERTRAIN VERIFICATION TEST - VER 2 .