Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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

Allow the engine to cool before you perform this test. If the HO2S voltage stays between 300-600 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 battery 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 feed circuits at the underhood electrical center for poor connections.

8

Inspect the splice pack for the ground circuits for an open circuit. A condition at the splice pack sets more than one heater DTC.