Removal and installation of the air-fuel mixture sensor
Attention.
- A hot engine and exhaust system components can cause various burns. Shut off the engine and wait for them to cool down before removing the exhaust system components.
- Avoid contact with flammable objects (e.g. electrical tape) with exhaust manifold and muffler.
Note:
- If the leak test spray enters the air-fuel ratio sensor airflow hole, it may interfere with the air-fuel ratio sensor.
- When removing the air fuel ratio sensor, wrap a rag around the bottom of the sensor to prevent spray from entering the airflow hole.
1. Disconnect the negative battery terminal.
2. Remove the decorative engine cover.
3. Disconnect the air-fuel ratio sensor connector.
4. Remove the clip from the heat shield.
5. Remove the wiring harness from the terminals A and B of the electrical wiring.
6. Remove the air-fuel ratio sensor using the special tool.
7. Installation is made in an order, the return to removal.
Note: Secure the wiring harness in clamp A by wrapping it with a heat-shrink sleeve.
Note: Fix the cable ties so that they are on both sides of terminal B.
Checking the air-fuel ratio sensor
1. Connect the M-MD8 device to the DLC-2 diagnostic connector.
2. Turn on the ignition (engine on).
3. Warm up the engine to operating temperature.
4. Display the following parameters on the M-MDS:
- V88 (vehicle speed)
- RPM (engine speed)
- 02511 (air fuel ratio sensor output current)
5. Drive the vehicle while reducing the engine speed by fully releasing the pedal from a speed of 3000 rpm or more.
6. Verify that the air fuel ratio sensor output current (02811 according to M-MD8) is at least 0.25 mA as shown in the figure. If the readings are not correct, replace the air fuel sensor with a new one.
Checking the heating of the air-fuel mixture sensor
Attention. A hot engine and exhaust system components can cause various burns. Shut off the engine and wait for them to cool down before removing the exhaust system components.
1. Disconnect the negative battery terminal.
2. Disconnect the air fuel ratio sensor connector.
3. Measure the resistance between terminals A and E of the air-fuel mixture sensor.
Note: Air fuel sensor heating resistance: 1-10 ohm (at normal temperature).