Diagnostic Test

CHECK FOR DTCs IN PCM
1. Turn the ignition on.
2. Using a scan tool, read PCM DTCs.
  Are any DTCs present?
  
  Yes
  - Diagnose and repair the DTC(s). Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing .
  No
  - DTC set due to engine operated at RPM limit. Using the scan tool, clear ACC module DTCs.
  - Perform ACC MODULE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Adaptive Cruise Control (ACC) - Standard Procedure .