PR25DD engine
- CHECK DTC PRIORITY
If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected?
YES
Perform diagnosis of applicable. Refer to DTC Index .
NO
GO TO 2.
- CHECK HARNESS CONNECTOR
- Disconnect mass air flow (MAF) sensor harness connector and ECM harness connector.
- Connect MAF sensor harness connector and ECM harness connector.
- Perform DTC Confirmation Procedure. DTC Description
Is 1st trip DTC detected?
YES
GO TO 3.
NO
INSPECTION END
- CHECK INTAKE SYSTEM
Check the following for connection.
- Air duct
- Vacuum hoses
- Intake air passage between air duct and intake manifold
Is the inspection result normal?
YES
GO TO 4.
NO
Reconnect the parts.
- CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect MAF sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between MAF sensor harness connector and ground.
+
-
Voltage
MAF sensor
Connector
Terminal
F31
1
Ground
5 V
Is the inspection result normal?
YES
GO TO 6.
NO
GO TO 5.
- CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Perform Refer to Diagnosis Procedure .
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK MAF SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAF sensor harness connector and ECM harness connector.
+
-
Continuity
MAF sensor
ECM
Connector
Terminal
Connector
Terminal
F31
3
F91
23
Existed
- Also check harness for short to power.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- CHECK MAF SENSOR INPUT SIGNAL CIRCUIT
- Check the continuity between MAF sensor harness connector and ECM harness connector.
+
-
Continuity
MAF sensor
ECM
Connector
Terminal
Connector
Terminal
F31
2
F91
26
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
GO TO 8.
NO
Repair or replace error-detected parts
- Check the continuity between MAF sensor harness connector and ECM harness connector.
- CHECK INTAKE AIR TEMPERATURE SENSOR
Check the intake air temperature sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 9.
NO
Replace MAF sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .
- CHECK PCV VALVE
Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance .
Is the inspection result normal?
YES
GO TO 10.
NO
Replace PCV valve.
- PERFORM IDLE AIR VOLUME LEARNING
Perform the idle air volume learning. Refer to Work Procedure .
YES
GO TO 11.
- CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check the EVAP control system pressure sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 12.
NO
Replace EVAP control system pressure sensor. Refer to EVAP CANISTER : Removal & Installation .
- PERFORM EVAP LEAK CHECK
Preform the EVAP leak check. Refer to EVAPORATIVE EMISSION SYSTEM : Inspection .
YES
GO TO 13.
- CHECK MAF SENSOR
Check the MAF sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
Replace MAF sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .