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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  2. Connect a scan tool. Are there any transmission DTCs set? If yes, go to next step. If no, go to step  5.
  3. Diagnose and repair any transmission DTCs. After repairs, go to next step.
  4. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running in the DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, go to INTERMITTENTS in appropriate FAULT ISOLATION article in ENGINE PERFORMANCE.
  5. Disconnect the TCM. Connect a Digital Multimeter (DMM) from the MIL request circuit in the TCM harness connector to a good ground. Turn ON the ignition, with the engine OFF. Does the voltage measure near battery voltage? If yes, go to step  7. If no, go to next step.
  6. Test the MIL request circuit for a short to ground. Did you find and correct the condition? If yes, go to step  9. If no, go to step  8.
  7. Replace the TCM. After repairs, go to step  9.
  8. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Reprogram PCM. See PROGRAMMING in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to next step.
  9. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  10. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no, system is okay.
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