O2 Sensor Signal Inspection
- Ignition "OFF".
- Connect VMI to GDS and set up an oscilloscope as follow (4-channel);
Channel A (+): Pin No. 3 (V_IP) terminal of Upstream O2 Sensor.
Channel A (-): Ground
Channel B (+): Pin No. 1 (signal) terminal of Downstream O2 Sensor.
Channel B (-): Ground
- Ignition "ON" & Engine "ON".
- Approx. 2500 RPM.
- Fuel Cut after acceleration.
- Is the measured value within speechification?
YES
- Go to "FUEL SYSTEM INSPECTION " procedure.
NO
- Carefully re-do this troubleshooting guide steps.
- If no problems were found with the circuits or connectors, Replace the O2 Sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CAUTION:- Install the component with the specified torques.
- Note that internal damage may occur when the component is dropped or mis-treated.
CAUTION:- DO NOT use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may cause malfunction or affects on sensor performance.
- Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and others).