DTC Diagnosis Procedure
- 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 or P0174 detected? Is it difficult to start engine?
YES
Perform trouble diagnosis for DTC P0171 or P0174. Refer to DTC Description or DTC Description .
NO
GO TO 2.
- CHECK HO2S2 GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
- Disconnect ECM harness connector.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
+
-
Continuity
HO2S2
ECM
Bank
Connector
Terminal
Connector
Terminal
2
F12
4
F54
35
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace error-detected parts.
- CHECK HO2S2 INPUT SIGNAL CIRCUIT
- Check the continuity between HO2S2 harness connector and ECM harness connector.
+
-
Continuity
HO2S2
ECM
Bank
Connector
Terminal
Connector
Terminal
2
F12
1
F54
32
Existed
- Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
+
-
Continuity
HO2S2
Bank
Connector
Terminal
2
F12
1
Ground
Not existed
+
-
Continuity
ECM
Bank
Connector
Terminal
2
F54
32
Ground
Not existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
- CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 5.
- REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View .
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