DTC Diagnosis Procedure
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect A/F sensor 1 harness connector.
- Turn ignition switch ON.
- Check the voltage between A/F sensor 1 harness connector and ground.
+
-
Voltage
A/F sensor 1
Bank
Connector
Terminal
2
F5
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
+
-
Continuity
A/F sensor 1
IPDM E/R
Bank
Connector
Terminal
Connector
Terminal
2
F5
1
E119
8
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
+
-
Continuity
A/F sensor 1
ECM
Bank
Connector
Terminal
Connector
Terminal
2
F5
3
F77
76
Existed
4
77
- Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
+
-
Continuity
A/F sensor 1
Bank
Connector
Terminal
2
F5
3
Ground
Not existed
4
+
-
Continuity
ECM
Bank
Connector
Terminal
2
F77
76
Ground
Not existed
77
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident .
Is the inspection result normal?
YES
GO TO 5.
NO
Repair or replace error-detected parts.
- REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. Refer to Removal and Installation (Three Way Catalyst) .
CAUTION:- Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial service tool).
INSPECTION END