PR25DD engine
- INSPECTION START
Confirm the detected malfunction (A or B). DTC Description
Which malfunction is detected?
A
GO TO 2.
B
GO TO 7.
- CHECK HO2S2 CONNECTOR FOR WATER
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 harness connector.
- Check connectors for water.
Water should not exist.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace error-detected parts.
- CHECK HO2S2 GROUND CIRCUIT
- Disconnect ECM harness connector.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
+
-
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
E78
4
F90
76
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 HO2S2 INPUT SIGNAL CIRCUIT
- Check the continuity between HO2S2 harness connector and ECM harness connector.
+
-
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
E78
3
F90
77
Existed
- Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
+
-
Continuity
HO2S2
Connector
Terminal
E78
3
Ground
Not existed
+
-
Continuity
ECM
Connector
Terminal
F90
77
Ground
Not existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 5.
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 Inspection .
NO
GO TO 6.
- REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View (AWD MODELS WITH PR25DD ENGINE), Exploded View (FWD MODELS WITH PR25DD ENGINE).
INSPECTION END
- CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE CLEAR
- Clear the mixture ratio self-learning value clear. Refer to Work Procedure .
- Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?
YES
Perform trouble diagnosis for DTC P0172. DTC Description
NO
GO TO 8.
- CHECK HO2S2 GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 harness connector.
- Disconnect ECM harness connector.
- Check the continuity between HO2S2 harness connector and ECM harness connector.
+
-
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
E78
4
F90
76
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
GO TO 9.
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
Connector
Terminal
Connector
Terminal
E78
3
F90
77
Existed
- Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.
+
-
Continuity
HO2S2
Connector
Terminal
E78
3
Ground
Not existed
+
-
Continuity
ECM
Connector
Terminal
F90
77
Ground
Not existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 10.
NO
Repair open circuit or short to ground or short to power in harness or connectors.
- 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 Inspection .
NO
GO TO 11.
- REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View (AWD MODELS WITH PR25DD ENGINE), Exploded View (FWD MODELS WITH PR25DD ENGINE).
INSPECTION END