 1.CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES >>GO TO 2. NO >>Repair or replace ground connection.
 2.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
- Disconnect air fuel ratio (A/F) sensor 1 harness connector.
- Turn ignition switch ON.
- Check the voltage between A/F sensor 1 harness connector and ground.
DTC
| A/F sensor 1
| Ground
| Voltage
| Bank
| Connector
| Terminal
| P0031, P0032
| 1
| F8
| 4
| Ground
| Battery voltage
| P0051, P0052
| 2
| F25
| 4
|
Is the inspection result normal?
YES >>GO TO 4. NO >>GO TO 3.
 3.DETECT MALFUNCTIONING PART
Check the following. - Harness connectors E3, F1
- IPDM E/R harness connector E7
- 15A fuse (No. 46)
- Harness for open or short between A/F sensor 1 and fuse
>>Repair or replace harness or connectors.
 4.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
DTC
| A/F sensor 1
| ECM
| Continuity
| Bank
| Connector
| Terminal
| Connector
| Terminal
| P0031, P0032
| 1
| F8
| 3
| F101
| 4
| Existed
| P0051, P0052
| 2
| F25
| 3
| 3
|
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >>GO TO 5. NO >>Repair open circuit, short to ground or short to power in harness or connectors.
 5.CHECK A/F SENSOR 1 HEATER
 6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1. ■ CAUTION ■ - Discard any A/F sensor which has been dropped from a height of more than 0.5 m (1.6 ft) onto a hard surface such as a concrete floor; use a new one.
- Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).
>>INSPECTION END
 7.CHECK INTERMITTENT INCIDENT
|