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Diagnostic Procedures

NOTE: DO NOT perform this diagnostic if no driveability condition exists, unless directed from another procedure. Search for applicable service bulletins before proceeding with diagnosis. DO NOT clear DTCs unless instructed by a diagnostic procedure. If there is a condition with the starting system, see appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. Ensure the battery is fully charged. Ensure the battery cables are clean and tight. Ensure PCM grounds are clean, tight, and in the proper location.
  1. Install a scan tool. Does the scan tool power-up? If yes, go to next step. If no, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ON ignition, with engine OFF. Attempt to establish communication with the Powertrain Control Module (PCM). Does the scan tool communicate with PCM? If yes, go to next step. If no, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Attempt to start the engine. Does the engine start and idle? If yes, go to next step. If no, see ENGINE CRANKS BUT DOES NOT RUN in appropriate in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  4. Select the DTC Information on the scan tool. Does the scan tool display any Powertrain DTCs? If yes, go to next step. If yes, go to step  7 .
  5. With the scan tool, save or capture the Powertrain DTC Information, Store Information, then go to next step.
  6. Does the scan tool display DTC P1600? If yes, go to DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 Or P1683  . If no, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  7. Is the customer's concern with a 3-speed automatic transmission? If yes, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, go to next step.
  8. Is the customer's concern with a 4-speed automatic transmission? If yes, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, go to next step.
  9. Is the customer's concern with Inspection/Maintenance (I/M) testing? If yes, see INSPECTION/MAINTENANCE SYSTEM CHECK  under INSPECTION/MAINTENANCE PROCEDURES. If no, go to next step.
  10. Review the following symptoms. Hard start, surges/chuggles, lack of power, sluggishness, sponginess, detonation/spark knock, hesitation, sag, stumble cuts out, misses, poor fuel economy, poor fuel fill quality, rough, unstable/incorrect idle, stalling, dieseling, run-on, backfire or Malfunction Indicator Light (MIL) inoperative or always on. Did you find and correct the condition? If yes, system is okay. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
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