Front HO2S Current Inspection
- Warm up the engine to normal operating temperature.
- Using the M-MDS, monitor the following:
- Vehicle speed (PID: VSS)
- Engine speed (PID: RPM)
- Front HO2S current (PID: O2S11)
- Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more .
- Verify that the front HO2S current (PID: O2S11) is 0.25 mA or more
while decelerating as shown in the figure.
- If not within the specification, inspect the HO2S for an open or short circuit. (See FRONT HO2S CIRCUIT OPEN/SHORT INSPECTION (SENSOR ).) Then if there is no malfunction in the wiring harness, replace the front HO2S.