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 on the diagnostic table.

4) - This step tests for voltage supplied to the EBCM from the PCM.
5) - This step verifies the EBCM is creating a requested torqued signal with a valid Hz frequency.
6) - This step verifies the EBCM is creating a requested torque signal with a valid duty cycle.
7) - The EBCM may be damaged if the requested torque signal circuit is shorted to voltage.

Fig 1: DTC C0298 Or P1571 Diagnosis (Steps 1-3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0298 Or P1571 Diagnosis (Steps 4-12)

Courtesy of GENERAL MOTORS CORP.