Test Description

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. 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

Before you perform this test, allow the engine to cool. If the sensor is at the operating temperature, the HO2S voltage will stay high or low. If the HO2S voltage stays between 300-700 mV, the HO2S heater is inoperative.

3

If more than one HO2S DTC is set, the HO2S fuse may be open. Test all the related circuits going to all the HO2S for a short to ground. If you cannot locate a shorted circuit, it may be necessary to disconnect each HO2S one at a time in order to locate a shorted sensor.

4

This step tests whether an Ignition 1 voltage supply is available at the sensor.

5

This step tests whether a ground is available at the sensor.

6

This step tests whether the HO2S heater element is internally open.

7

Inspect the ignition 1 voltage circuits at the underhood electrical center for poor connections.

8

Test the ground circuits for an open if more than one heater DTC sets.