PR25DD engine

1. Disconnect MAF sensor harness connector and ECM harness connector.
2. Connect MAF sensor harness connector and ECM harness connector.
3. Perform DTC Confirmation Procedure. DTC Description 

Is DTC detected?

YES

GO TO 2.

NO

INSPECTION END

Check the following for connection.

• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold

Is the inspection result normal?

YES

GO TO 3.

NO

Reconnect the parts. Refer to AIR CLEANER AND AIR DUCT : Exploded View .

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

   +		-	Voltage
   MAF sensor
   Connector	Terminal
   F31	1	Ground	5 V

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 4.

Refer to Diagnosis Procedure .

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

NO

Repair or replace error-detected parts.

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

   +		-		Continuity
   MAF sensor		ECM
   Connector	Terminal	Connector	Terminal
   F31	3	F91	23	Existed

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

1. Check the continuity between MAF sensor harness connector and ECM harness connector.

   +		-		Continuity
   MAF sensor		ECM
   Connector	Terminal	Connector	Terminal
   F31	2	F91	26	Existed

2. Also check harness for short to ground and 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 MAF sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Inspection .

NO

Replace mass air flow sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .