DTC Diagnosis Procedure

1. Disconnect mass air flow sensor harness connector and ECM harness connector.
2. Connect mass air flow sensor harness connector and ECM harness connector.
3. Perform DTC confirmation procedure. Refer to Confirmation Procedure .

Is DTC detected?

YES

GO TO 2.

NO

INSPECTION END

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 3.

NO

Reconnect or replace error-detected parts.

1. Disconnect mass air flow sensor harness connector.
2. Turn ignition switch ON.
3. 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 5.

NO

GO TO 4.

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.

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.

   Mass air flow sensor		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F31	4	F91	42	Existed

4. 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.

1. 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	F91	37	Existed

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

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace error-detected parts.

Check intake air temperature sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 8.

NO

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

Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance Operation .

Is the inspection result normal?

YES

GO TO 9.

NO

Replace PCV valve.

Perform the idle air volume learning. Refer to Work Procedure .

GO TO 10.

Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 11.

NO

Replace EVAP control system pressure sensor. Refer to EVAP CANISTER : Removal & Installation .

Perform EVAP leak check. Refer to EVAP CANISTER : Periodic Maintenance Operation .

GO TO 12.

Check mass air flow 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 .