For Mexico

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:


Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and let it idle for at least 10 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NG- INSPECTION END


Diagnosis Procedure


1. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2.Turn ignition switch ON.
3.Check the voltage between A/F sensor 1 harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. DETECT MALFUNCTIONING PART

Check the following.
- 20 A fuse (No. 43)
- Harness for open or short between A/F sensor 1 and fuse
- Loose or poor connection for each connector and harness
- Repair or replace harness or connectors.

3. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between A/F sensor 1 harness connector and ECM harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

4. CHECK A/F SENSOR 1 HEATER

Refer to "Component Inspection (A/F Sensor 1 Heater)" .
Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.

5. REPLACE A/F SENSOR 1

Replace malfunctioning A/F sensor 1. Refer to "Exploded View" Exploded View.

CAUTION:
- Discard any A/F 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 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

6. CHECK INTERMITTENT INCIDENT

Perform "Intermittent Incident" Intermittent Incident.
- INSPECTION END


Component Inspection (A/F Sensor 1 Heater)


1. CHECK AIR FUEL RATIO (A/F) SENSOR 1

1.Turn ignition switch OFF.
2.Disconnect air fuel ratio (A/F) sensor 1 harness connector.
3.Check resistance between A/F sensor 1 terminals as per the following.





Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 2.

2. REPLACE A/F SENSOR 1

Replace malfunctioning A/F sensor 1. Refer to "Exploded View" Exploded View.

CAUTION:
- Discard any A/F 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 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