HO2S Inspection
- Warm up the engine to normal operating temperature.
- Access the following PIDs using the M-MDS: (See
ON-BOARD DIAGNOSTIC TEST
.)
- VSS (Vehicle speed)
- RPM (Engine speed)
- O2S12 (HO2S voltage)
- 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 HO2S voltage (PID: O2S12) of 0.6 V or more,
one time or more, then verify that the HO2S voltage (PID: O2S12) is 0.3 V or less
while decelerating as shown in the illustration.
Courtesy of MAZDA MOTORS CORP.