Diagnostic Procedure
- Turn the ignition on.
With the DRBIII®, erase DTCs.
Cycle the ignition key on and off several times. Leaving the ignition on for at least 20 seconds.
With the DRBIII®, read DTCs.
Does the DTC reset?
- Yes: Go To 2
- No: Go To 4.
- Turn the ignition on.
With the DRBIII®, attempt to communicate with the BCM.
Can communication be established with the BCM?
- Yes: Go To 3
- No: Refer to
appropriate symptom related to no communication with BCM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .
- Turn the ignition off.
Disconnect the PCM harness connector
Disconnect the BCM harness connector.
Measure the resistance of both the CCD BUS circuits between the PCM harness connector and the BCM harness connector.
Is the resistance below 5 ohms for both measurements?
- Yes: Replace and program the Powertrain Control Module in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .
- No: Repair the CCD BUS circuit(s) for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .
- Yes: Replace and program the Powertrain Control Module in accordance with the Service Information.
- With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any of the above conditions present?
- Yes: Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .
- No: Test Complete.
- Yes: Repair as necessary.