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 or 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 or 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 or Component Inspection . Is the inspection result normal?
YES>>
GO TO 9
.
NO>>
Replace mass air flow sensor (with intake air temperature sensor) or AIR CLEANER AND AIR DUCT : Removal and Installation .
- CHECK PCV VALVE
Check the PCV valve or POSITIVE CRANKCASE VENTILATION : Periodic Maintenance . Is the inspection result normal?
YES>>
GO TO 10.
NO>>
Replace PCV valve.
- CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to Component Inspection . Is the inspection result normal?
YES>>
GO TO 11
.
NO>>
Replace EVAP control system pressure sensor or EVAP CANISTER : Removal and Installation .
- PERFORM EVAP LEAK CHECK
Perform EVAP leak check or EVAP CANISTER : Periodic Maintenance .
>>
GO TO 12
.
- CHECK THROTTLE POSITION SENSOR
Check the following with the freeze frame data of DTC P0101:
ENGINE SPEED Idling speed VEHICLE SPEED 0 KM/H S-FUEL TRM-B1 not 125% Is the freeze frame data under the above condition?
YES>>
Perform idle air volume learning or Work Procedure .
NO>>
GO TO 13.
- CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor or Component Inspection . Is the inspection result normal?
YES>>
Check intermittent incident or Inspection .
NO>>
Replace mass air flow sensor or AIR CLEANER AND AIR DUCT : Exploded View .