Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step number in the diagnostic procedures.

4

This step ensures that the ignition 1 voltage circuit to HO2S is not open or shorted. The test light should be connected to a good chassis ground, in case the HO2S low reference or HO2S heater low control circuit is malfunctioning.

5

This step checks the HO2S heater low control circuit. The engine must be running for PCM to enable the heater.

6

This step checks for a short to ground in HO2S heater low control circuit.

7

This step checks for a short to voltage on HO2S heater low control circuit.