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 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 4.
NO: GO TO 3.
- 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 F111 25 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES: GO TO 5.
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 F111 22 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES: GO TO 6.
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 7.
NO: Replace mass air flow sensor (with intake air temperature sensor). Refer to "REMOVAL AND INSTALLATION ".
- CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to "COMPONENT INSPECTION (EVAP CONTROL SYSTEM PRESSURE SENSOR) ".
Is the inspection result normal?
YES: GO TO 8.
NO: Replace EVAP control system pressure sensor. Refer to "REMOVAL AND INSTALLATION "
- CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor. Refer to "COMPONENT INSPECTION (MAF SENSOR) ".
Is the inspection result normal?
YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".
NO: Replace mass air flow sensor. Refer to "REMOVAL AND INSTALLATION ".