Test Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 in the diagnostic procedures.
- 4
This step tests the TCM and circuit 400 for voltage at the ECM connector. - 5
This step tests for continuity and a short to ground in the wiring system between the TCM and ECM.