Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws.

   Refer to GROUND INSPECTION .

1. OK or NG 
2. OK: GO TO 2.
3. NG: Repair or replace ground connections.

1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) harness connector.
2. Turn ignition switch ON.
3. Check voltage between mass air flow sensor terminal 5 and ground.

1. Voltage: Approximately 5V 
2. OK or NG 
3. OK: GO TO 3.
4. NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 3 and ECM terminal 109.

   For wiring diagram, refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

1. OK or NG 
2. OK: GO TO 4.
3. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to DIAGNOSTIC PROCEDURE .

1. OK or NG 
2. OK: GO TO 5.
3. NG: Replace mass air flow sensor (with intake air temperature sensor).

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

1. : INSPECTION END