Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector of the appropriate HO2S.
Ignition ON, verify that the HO2S parameter is between 350-500 mV.
- If greater than the specified value, test the signal circuit of the HO2S sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
Verify that none of the following conditions exist:
- Rich fuel injectors - Refer to FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL or FUEL INJECTOR BALANCE TEST WITH TECH 2 .
- Water intrusion in the HO2S harness connector
- High fuel system pressure - Refer to FUEL SYSTEM DIAGNOSIS .
- Fuel that is contaminated - Refer to ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS (W/O SPECIAL TOOL) and ALCOHOL/CONTAMINANTS-IN-FUEL DIAGNOSIS (W/ SPECIAL TOOL) .
- Fuel saturation of the evaporative emissions (EVAP) canister
- Restricted exhaust
- Contaminated HO2S - Silicon
  - If you find any of the above conditions, repair as necessary.
If all circuits/connections test normal, replace the applicable HO2S.