EXHAUST GAS TEMPERATURE SENSOR INSPECTION [MZR-CD (RF Turbo)]

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Warning

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

Caution

•  Perform exhaust gas temperature sensor removal/installation only when inspection or replacement is required, such as when DTCs for the sensor are displayed, because it may cause exhaust gas leaks. If removal or installation/removal is performed, always verify that there is no exhaust gas leak after reinstallation.

Note

•  Perform the following test only when directed.

Resistance Inspection

1.  Remove the exhaust gas temperature sensor.

2.  Place the Exhaust gas temperature sensor in water with a thermometer, and heat the water gradually.

3.  Measure the resistance between the Exhaust gas temperature sensor terminals using an ohmmeter.

•  If not as specified, replace the Exhaust gas temperature sensor.

•  If exhaust gas temperature sensor is okay, perform the “Circuit Open/Short Inspection”.

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Circuit Open/Short Inspection

Exhaust gas temperature sensor (upper)

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2.  Inspect for open/short circuit in the following wiring harnesses.

•  If there is open/short circuit, repair or replace wiring harness.

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Open circuit

•  Exhaust gas temperature sensor (upper) terminal A and PCM terminal 56

•  Exhaust gas temperature sensor (upper) terminal B and PCM terminal 61

Short circuit

•  Exhaust gas temperature sensor (upper) terminal A and power supply

•  Exhaust gas temperature sensor (upper) terminal A and body ground

•  Exhaust gas temperature sensor (upper) terminal B and power supply

Exhaust gas temperature sensor (middle)

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2.  Inspect for open/short circuit in the following wiring harnesses.

•  If there is open/short circuit, repair or replace wiring harness.

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Open circuit

•  Exhaust gas temperature sensor (middle) terminal A and PCM terminal 61

•  Exhaust gas temperature sensor (middle) terminal B and PCM terminal 57

Short circuit

•  Exhaust gas temperature sensor (middle) terminal A and power supply

•  Exhaust gas temperature sensor (middle) terminal B and power supply

•  Exhaust gas temperature sensor (middle) terminal B and body ground

Exhaust gas temperature sensor (lower)

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2.  Disconnect the exhaust gas temperature sensor (lower) connector.

3.  Inspect for open/short circuit in the following wiring harnesses.

•  If there is open/short circuit, repair or replace wiring harness.

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Open circuit

•  Exhaust gas temperature sensor (lower) terminal A and PCM terminal 33

•  Exhaust gas temperature sensor (lower) terminal B and PCM terminal 72

Short circuit

•  Exhaust gas temperature sensor (lower) terminal A and power supply

•  Exhaust gas temperature sensor (lower) terminal A and body ground

•  Exhaust gas temperature sensor (lower) terminal B and power supply