Diagnostic Test

VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE:
Make sure the battery is fully charged before proceeding.
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.
  Does the scan tool display: U1733-87-LOST COMMUNICATION WITH CTM?
  
  Yes
  - Refer to U1733-87-LOST COMMUNICATION WITH CTM and perform the U1733-87-Lost Communication with CTM diagnostic procedure.
  No
  - Refer to DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.