Test Description
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.
The numbers below refer to the step numbers on the diagnostic table.
- 1. This test ensures that the scan tool is getting power.
- 2. This test ensures that the scan tool is communicating to the PCM.
- 3. This test ensures that the PCM has the latest calibrations.
- 6. This test checks to see if any related DTCs should be diagnosed first.
- 9. This test checks to see if the customer concern is with Inspection and Maintenance (I/M) testing.