DTC Diagnosis Procedure
- RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to Exploded View .
GO TO 2.
- CHECK FOR EXHAUST GAS LEAK
- Start engine and run it at idle.
- Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas leak detected?
YES
Repair or replace.
NO
GO TO 3.
- CHECK A/F SENSOR 1 CONNECTOR
- Disconnect A/F sensor 1 harness connector.
- Check that water is not inside connectors.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace harness connector.
- CHECK FOR INTAKE AIR LEAKAGE
- Reconnect A/F sensor 1 harness connector.
- Start engine and run it at idle.
- Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES
Repair or replace malfunctioning part.
NO
GO TO 5.
- CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
- Clear the mixture ratio self-learning value. Refer to Description .
- Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES
Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to Diagnosis Procedure or Diagnosis Procedure .
NO
GO TO 6.
- CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY
- Turn ignition switch OFF.
- 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
P2096
P2097
1
F44
1
Ground
Battery voltage
P2098
P2099
2
F60
1
Is the inspection result normal?
YES
GO TO 8.
NO
GO TO 7.
- CHECK AIR FUEL RATIO 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.
DTC
A/F sensor 1
IPDM E/R
Continuity
Bank
Connector
Terminal
Connector
Terminal
P2096
P2097
1
F44
1
E121
4
Existed
P2098
P2099
2
F60
1
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
Perform trouble diagnosis for power supply circuit.
NO
Repair or replace malfunctioning part.
- CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- 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
P2096
P2097
1
F44
4
F79
79
Existed
3
74
P2098
P2099
2
F60
4
F79
69
3
70
- Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
DTC
A/F sensor 1
Ground
Continuity
Bank
Connector
Terminal
P2096
P2097
1
F44
4
Ground
Not Existed
3
P2098
P2099
2
F60
4
3
DTC
ECM
Ground
Continuity
Bank
Connector
Terminal
P2096
P2097
1
F79
79
Ground
Not Existed
74
P2098
P2099
2
F79
69
70
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 9.
NO
Repair or replace malfunctioning part.
- CHECK A/F SENSOR 1 HEATER
Refer to Component Inspection (A/F Sensor 1 Heater) .
Is the inspection result normal?
YES
GO TO 10.
NO
Repair or replace malfunctioning part.
- CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to Component Inspection (HO2 sensor 2) .
Is the inspection result normal?
YES
GO TO 11.
NO
Repair or replace malfunctioning part.
- REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. Refer to 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).
Will CONSULT be used?
YES
GO TO 12.
NO
GO TO 13.
- CONFIRM A/F ADJUSTMENT DATA
WITH CONSULT
- Turn ignition switch ON.
- Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
- Check that "0.000" is displayed on CONSULT screen.
Is "0.000" displayed?
YES
INSPECTION END
NO
GO TO 13.
- CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
Clear the mixture ratio self-learning value. Refer to Description .
Will CONSULT be used?
YES
GO TO 14.
NO
INSPECTION END
- CONFIRM A/F ADJUSTMENT DATA
- Turn ignition switch ON.
- Select "A/F ADJ-B1" and "A/F ADJ-B2" in "DATA MONITOR" mode with CONSULT.
- Check that "0.000" is displayed on CONSULT screen.
INSPECTION END