[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - ON-VEHICLE SERVICE - OXYGEN SENSOR CHECK | PRINT PAGE / INDEX / PRIOR / NEXT

| OXYGEN SENSOR CHECK
| OXYGEN SENSOR (FRONT) <Vehicles except for Hong kong> Disconnect the oxygen sensor connector and connect the special tool Test harness (MB991658) to the connector on the oxygen sensor side.
| Make sure that there is continuity (11 - 18 Ω at 20°C: Vehicles except for Brazil, Chile and Hong kong), (4.5 - 8.0 Ω at 20°C: Vehicles for Brazil and Chile) between terminal No. 1 and No. 3 on the oxygen sensor connector. If there is no continuity, replace the oxygen sensor. Warm up the engine until engine coolant is 80°C or higher. Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min. Connect a digital voltage meter between terminal No. 2 and No. 4. While repeatedly racing the engine, measure the oxygen sensor output voltage.
Standard value:
Engine | Oxygen sensor output voltage | Remarks
--- | --- | ---
When racing the engine | 0.6 - 1.0 V | If you make the air-fuel ratio rich by racing the engine repeatedly, a normal oxygen sensor will output a voltage of 0.6 - 1.0 V.
| CAUTION Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor. Be careful the heater is broken when voltage of beyond 8V is applied to the oxygen sensor heater. NOTE: If the sufficiently high temperature (of approximate 400°C or more) is not reached although the oxygen sensor is normal, the output voltage would be possibly low although the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect the terminal No. 1 and the terminal No. 3 of the oxygen sensor with a (+) terminal and (-) terminal of 8 V power supply respectively, then check again. If the sensor is defective, replace the oxygen sensor. NOTE: For removal and installation of the oxygen sensor, refer to GROUP 15 - Exhaust Manifold. .
| OXYGEN SENSOR (REAR) <Vehicles for Brazil and Chile> Disconnect the oxygen sensor connector and connect the special tool Test harness (MD998464) to the connector on the oxygen sensor side.
| Make sure that there is continuity (11 - 18 Ω at 20°C) between terminal No.1 (red clip of special tool) and No. 3 (blue clip of special tool) on the oxygen sensor connector. If there is no continuity, replace the oxygen sensor. Warm up the engine until engine coolant is 80°C or higher. Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min.
| Connect a digital voltage meter between terminal No.2 (black clip of special tool) and No. 4 (white clip of special tool). While repeatedly racing the engine, measure the oxygen sensor output voltage.
Standard value:
Engine | Oxygen sensor output voltage | Remarks
--- | --- | ---
When racing the engine | 0.6 - 1.0 V | If you make the air-fuel ratio rich by racing the engine repeatedly, a normal oxygen sensor will output a voltage of 0.6 - 1.0 V.
| CAUTION Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor. Be careful the heater is broken when voltage of beyond 12 V is applied to the oxygen sensor heater. NOTE: If the sufficiently high temperature (of approximate 400°C or more) is not reached although the oxygen sensor is normal, the output voltage would be possibly low although the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect the terminal No.2 and the terminal No. 1 of the oxygen sensor with a (+) terminal and (-) terminal of 12 V power supply respectively, then check again. If the sensor is defective, replace the oxygen sensor. NOTE: For removal and installation of the oxygen sensor, refer to GROUP 15 - Exhaust Pipe and Main Muffler .
| OXYGEN SENSOR (FRONT) <Vehicles for Hong kong> Disconnect the oxygen sensor connector and connect the special tool Test harness (MB991316) to the connector on the oxygen sensor side.
| Make sure that there is continuity (4.5 - 8.0 Ω at 20°C) between terminal No. 1 (red clip of special tool) and No. 3 (blue clip of special tool) on the oxygen sensor connector. If there is no continuity, replace the oxygen sensor. Warm up the engine until engine coolant is 80°C or higher. Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min.
| Connect a digital voltage meter between terminal No. 2 (black clip of special tool) and No. 4 (white clip of special tool). While repeatedly racing the engine, measure the oxygen sensor output voltage.
Standard value:
Engine | Oxygen sensor output voltage | Remarks
--- | --- | ---
When racing the engine | 0.6 - 1.0 V | If you make the air-fuel ratio rich by racing the engine repeatedly, a normal oxygen sensor will output a voltage of 0.6 - 1.0 V.
| CAUTION Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor. Be careful the heater is broken when voltage of beyond 8V is applied to the oxygen sensor heater. NOTE: If the sufficiently high temperature (of approximate 400°C or more) is not reached although the oxygen sensor is normal, the output voltage would be possibly low although the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect the terminal No. 1 (red clip of special tool) and the terminal No. 3 (blue clip of special tool) of the oxygen sensor with a (+) terminal and (-) terminal of 8 V power supply respectively, then check again. If the sensor is defective, replace the oxygen sensor. NOTE: For removal and installation of the oxygen sensor, refer to GROUP 15 - Exhaust Manifold. .
| OXYGEN SENSOR (REAR) Disconnect the oxygen sensor connector and connect the special tool Test harness (MD998464) to the connector on the oxygen sensor side.
| Make sure that there is continuity (11 - 18 Ω at 20°C) between terminal No.1 (red clip of special tool) and No. 3 (blue clip of special tool) on the oxygen sensor connector. If there is no continuity, replace the oxygen sensor. Warm up the engine until engine coolant is 80°C or higher. Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min.
| Connect a digital voltage meter between terminal No.2 (black clip of special tool) and No. 4 (white clip of special tool). While repeatedly racing the engine, measure the oxygen sensor output voltage.
Standard value:
Engine | Oxygen sensor output voltage | Remarks
--- | --- | ---
When racing the engine | 0.6 - 1.0 V | If you make the air-fuel ratio rich by racing the engine repeatedly, a normal oxygen sensor will output a voltage of 0.6 - 1.0 V.
| CAUTION Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor. Be careful the heater is broken when voltage of beyond 12 V is applied to the oxygen sensor heater. NOTE: If the sufficiently high temperature (of approximate 400°C or more) is not reached although the oxygen sensor is normal, the output voltage would be possibly low although the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect the terminal No.2 and the terminal No. 1 of the oxygen sensor with a (+) terminal and (-) terminal of 12 V power supply respectively, then check again. If the sensor is defective, replace the oxygen sensor. NOTE: For removal and installation of the oxygen sensor, refer to GROUP 15 - Exhaust Pipe and Main Muffler .

[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - ON-VEHICLE SERVICE - OXYGEN SENSOR CHECK | PRINT PAGE / INDEX / PRIOR / NEXT

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