Diagnostic Test

ACTIVE DTC
1. Turn the ignition on.
2. With a scan tool, read PCM DTCs.
  Is the DTC active at this time?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing and perform the U0155-Loss Communication with Cluster/CCN diagnostic procedure.
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .