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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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HEATED OXYGEN SENSOR (HO2S) INSPECTION [SKYACTIV-G 2.0]

PID/DATA Monitor Inspection (HO2S)

1. Connect the M-MDS to the DLC–2.
2. Start the engine and warm it up completely.
3. Access the following PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

  • VSS (Vehicle speed)

  • RPM (Engine speed)

  • O2S12 (HO2S output voltage)

4. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
5. Verify that the HO2S output voltage (PID: O2S12) changes as shown in the figure during deceleration. (outputs 0.6 V or more once or more, then 0.3 V or less.)

Resistance Inspection (HO2S Heater)

WARNING:

  • A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

CAUTION:

  • Do not allow flammable objects such as the taping for bundling the wiring harness to come into contact with the exhaust system such as the exhaust manifold and silencer which reach high temperatures. Otherwise, it could cause fire damage.

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)
2. Lift up the vehicle.
3. Disconnect the HO2S connector.
4. Measure the resistance between HO2S terminals C and D.

    HO2S heater resistance

  • 2—50 ohms

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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