Diagnosis Procedure
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E21. Refer to Ground Inspection in "CIRCUIT INSPECTION ".
Is the inspection result normal?
YES: GO TO 2.
NO: Repair or replace ground connection.
- CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Disconnect mass air flow sensor (with intake air temperature sensor) harness connector.
- Turn ignition switch ON.
- Check the voltage between mass air flow sensor harness connector and ground.TERMINALS VOLTAGE REFERENCE
MAF sensor Ground Voltage Connector Terminal E18 2 Ground Approx. 5V
Is the inspection result normal?
YES: GO TO 4.
NO: GO TO 3.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E6, F123
- 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 INTAKE AIR TEMPERATURE 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.TERMINALS CONTINUITY REFERENCE
MAF sensor ECM Continuity Connector Terminal Connector Terminal E18 1 F8 56 Existed - Also check harness for short to ground and short to power.
Is the inspection result normal?
YES: GO TO 6.
NO: GO TO 5.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E6, F123
- 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 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).
- CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".
INSPECTION END