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.

5

This step tests for a short to ground in the MIL control circuit. With the ECM disconnected and the ignition ON the MIL should be OFF.

6

This step tests for a short to voltage on the MIL control circuit. With the fuse removed there should be no voltage on the MIL control circuit.

17

This vehicle is equipped with a ECM that utilizes an electrically erasable programmable read only memory (EEPROM). When the ECM is being replaced, the new ECM must be programed.