DTC Diagnosis Procedure
- 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 2.
NO
Reconnect or replace error-detected parts.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E15. Refer to Ground Inspection in Inspection .
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace ground connection.
- CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY CIRCUIT
- Disconnect MAF sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between MAF sensor harness connector and ground.
MAF sensor
Ground
Voltage
Connector
Terminal
F5
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 4.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between mass air flow sensor and ECM
Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAF sensor harness connector and ECM harness connector.
MAF sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F5
3
F25
92
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between MAF sensor harness connector and ECM harness connector.
MAF sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F5
2
F25
93
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 7.
NO
Repair open circuit or short to ground or short to power in harness or connectors.
- 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 8.
NO
Replace MAF sensor (with intake air temperature sensor). Refer to Removal and Installation .
- 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 9.
NO
Replace EVAP control system pressure sensor. Refer to Removal and Installation .
- 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 Removal and Installation .