Inspection steps
- Check oxygen sensor connector and intermediate connector.
- Disconnect the oxygen sensor connector and the intermediate connector.
- Check the connectors for ingress of water.
NG: Completely remove water from the connectors.
OK: Go to next step
- Check harness between engine control computer and oxygen sensor connector.
- Turn the ignition switch to OFF.
- Disconnect connectors from the engine control computer and the oxygen sensor.
- Measure the resistance between the engine control computer connector and the oxygen sensor connector.
Result
Result Go to Resistance between A36-6 -C13-1 and A34-21 -C13-3 is less than 1Ω A Resistance between A36-6 -C13-1 and A34-21 -C13-3 is 1Ω or more B B: Repair or replace the wire harness or connector (air/fuel ratio sensor - engine control computer)
A: Go to next step
- Check harness between engine control computer and oxygen sensor connector.
- Measure the resistance between the engine control computer connector and the engine ground.
Result
Result Go to Resistance between C13-3 and engine ground is less than 1 MΩ. A Resistance between C13-3 and engine ground is 1 MΩ or more. B B: Repair short in the power supply of wire harness or connectors or replace them (air/fuel ratio sensor - engine control computer).
A: Go to next step
- Measure the resistance between the engine control computer connector and the engine ground.
- Check the exhaust system.
- Check the exhaust system for loose parts, improper installation, and damage (such as cracks and holes).
NG: Repair or replace the faulty parts.
OK: Replacement of oxygen sensor
- Check the exhaust system for loose parts, improper installation, and damage (such as cracks and holes).