Mazdaspeed6 L4-2.3L Turbo (2006)
Rear HO2S voltage inspection
1. Warm up the engine to normal operating temperature.
2. Using the WDS or equivalent, monitor the following:
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Vehicle speed (PID: VSS)
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Engine speed (PID: RPM)
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Rear HO2S voltage (PID: 02S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
4. Verify that the rear HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the rear HO2S voltage (PID: 02S12) is 0.3 V or
less while decelerating as shown in the figure.
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If not within the specification, inspect the HO2S for an open or short circuit. (See Rear HO2S circuit open/short inspection (sensor).) Then if
there is no malfunction in the wiring harness, replace the rear HO2S.
Rear HO2S circuit open/short inspection (sensor)
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspect)
