Diagnostic Test

ACTIVE DTC
NOTE: Diagnose all CAN B and C communication DTCs before continuing.
1. Ignition on, engine not running.
2. With a scan tool, view DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure
TCM COMMUNICATION RELATED DTC'S IN OTHER MODULES
1. With a scan tool check for TCM communication related DTCs in other modules on the CAN Bus.
  Are there any TCM communication related DTCs in other modules on the CAN Bus at this time?
  
  Yes
  - Replace and program the Transmission Control Module (TCM) in accordance with the Service Information.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure
  No
  - Replace and program the Engine Control Module (ECM) in accordance with the Service Information.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure