Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector.
- The Loop Status for the respective bank will default to Open when the DTC is current.
- The wide band sensors do not toggle or switch like a switching HO2S. The HO2S signals will be relatively stable for an idling engine.
- Inspect for fuel contamination. Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Inspect the HO2S bank 1 or bank 2 sensor 1 for water intrusion into the wiring harness and the sensor housing. Water can create a short to voltage in the HO2S signal circuit causing a false rich indication.
- For an intermittent condition, refer to Intermittent Conditions .
- The following table illustrates the typical voltages for the HO2S circuits:
HO2S Voltages
|
|
|---|---|
| HO2S Circuit | Voltage |
| Heater Control | Less than 0.5 V |
| Heater Supply Voltage | B+ |
| Reference Voltage | 3.3-3.8 V |
| Low Reference | 5.9-6.4 V |
| Pump Current | 4.8-5.3 V |
| Input Pump Current | 3.3-3.8 V |