Diagnostic Test

VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE:

Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

Turn the ignition on.
With the scan tool, read ORC DTCs.
Is the U0100-LOST COMMUNICATION WITH ECM/PCM DTC active?

Yes
- Refer to the TIPM DIAGNOSTIC CODE INDEX and perform the U0100-Lost Communication with ECM/PCM diagnostic procedure.
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .