Monitor Scantool Data
- Connect scantool to DLC (Data Link Cable).
- Warm up the engine to normal operating temperature.
- Monitor "HO2S" parameter on scantool.
The Normal data of HO2S heaters at idle, refer to Fig 1.
- Are the parameters displayed correctly?
YES
Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
Go to "TERMINAL AND CONNECTOR INSPECTION " procedure.