Test Description

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. 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.

2

This step verifies that the fault is present. A hard start is observed when a malfunction is present.

4

This step tests the 12-volt reference circuit of the CMP sensor from the PCM to the CMP.

5

This step tests the CMP low reference circuit from the PCM to the CMP.

6

This step tests the CMP sensor signal circuit. Applying a voltage causes the CMP signal input - high to low and low to high parameter to increase if the circuit and the PCM are operating properly.

7

This step tests the resistance of the CMP sensor 12-volt reference circuit from the PCM to the CMP sensor.

9

This step tests the resistance of the CMP sensor low reference circuit from the PCM to the CMP sensor.