Diagnosis Procedure

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

   +		-	Voltage (Approx.)
   MAF sensor
   Connector	Terminal
   E64	4	Ground	5 V

Is the inspection result normal?

YES

GO TO 3.

NO

GO TO 2.

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

   MAF sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E64	4	F78	40	Existed

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

Is the inspection result normal?

YES

Perform trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

NO

Repair or replace error-detected parts.

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

   MAF sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E64	3	F78	42	Existed

4. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.

1. Check the continuity between ECM harness connector and ground.

   ECM		--	Continuity
   Connector	Terminal
   F78	2	Ground	Existed
   	7
   F79	87
   	88
   	95
   E32	199
   	201
   	204

2. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 5.

NO

Repair or replace error-detected parts.

Refer to Component Inspection (Intake Air Temperature Sensor) .

Is the inspection result normal?

YES

INSPECTION END.

NO

Replace mass air flow sensor (with intake air temperature sensor). Refer to AIR CLEANER AND AIR DUCT .