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Diagnostic System Check

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you review DESCRIPTION & OPERATION? If so, go to next step. If not, go to DESCRIPTION & OPERATION .
  2. Install a scan tool. Does the scan tool power up? If so, go to next step. If not, see SCAN TOOL DOES NOT POWER UP in DATA LINK COMMUNICATIONS.
  3. Turn ignition on. Attempt to establish communication with the Powertrain Control Module (PCM). Does the scan tool communicate with the PCM? If so, go to next step. If not, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in DATA LINK COMMUNICATIONS.
  4. Select the PCM display DTCs function on the scan tool. Does the scan tool display any DTCs? If so, go to next step. If not, go to SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  5. Does the scan tool display any DTCs which begin with a "U"? If so, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in DATA LINK COMMUNICATIONS. If not, go to next step.
  6. Does the scan tool display any DTCs which begin with a "P" that are associated with the HVAC system? If so, go to DIAGNOSTIC TESTS . If not, see appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE.
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