DTC Diagnosis Procedure
- 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 sensor harness connector and ECM harness connector.
- Connect mass air flow sensor harness connector and ECM harness connector.
- Perform DTC confirmation procedure. Refer to Confirmation Procedure .
Is DTC detected?
YES
GO TO 3.
NO
INSPECTION END
- CHECK INTAKE SYSTEM
Check the following items to see the installation condition and the connection condition of the joint.
- Air duct
- Vacuum hoses
- Intake air passage between air duct and intake manifold
Is the inspection result normal?
YES
GO TO 4.
NO
Reconnect or replace error-detected parts.
- CHECK MASS AIR FLOW SENSOR POWER SUPPLY CIRCUIT
- Disconnect mass air flow sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between mass air flow sensor harness connector and ground.
+
-
Voltage
Mass air flow sensor
Connector
Terminal
F31
5
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 6.
NO
GO TO 5.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between mass air flow sensor and ECM
- Harness for open or short between mass air flow sensor and IPDM E/R
- Loose or poor connection for each connector and harness
Repair or replace error-detected parts.
- CHECK MASS AIR FLOW SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between mass air flow sensor harness connector and ECM harness connector.
Mass air flow sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F31
4
F91
42
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair or replace error-detected parts.
- CHECK MASS AIR FLOW SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between mass air flow sensor harness connector and ECM harness connector.
Mass air flow sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F31
3
F91
37
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 8.
NO
Repair or replace error-detected parts.
- Check the continuity between mass air flow sensor harness connector and ECM harness connector.
- CHECK INTAKE AIR TEMPERATURE SENSOR
Check intake air temperature sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
GO TO 9.
NO
Replace mass air flow sensor (with intake air temperature sensor). Refer to AIR CLEANER AND AIR DUCT : Removal & Installation .
- CHECK PCV VALVE
Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance Operation .
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 .
GO TO 11.
- CHECK 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
Perform EVAP leak check. Refer to EVAP CANISTER : Periodic Maintenance Operation .
GO TO 13.
- CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
Replace mass air flow sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .