Diagnosis Procedure

If DTC P0101 is displayed with other DTC, first perform the confirmation procedure (trouble diagnosis) for other DTC.

Is applicable DTC detected?

YES

Perform diagnosis of applicable. Refer to DTC Index .

NO

GO TO 2.

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 DTC Description .

Is DTC detected?

YES

GO TO 3.

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 4.

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 (Approx.)
   Mass air flow sensor
   Connector	Terminal
   E64	1	Ground	5 V

Is the inspection result normal?

YES

GO TO 6.

NO

GO TO 5.

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
   E64	1	F78	37	Existed

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

Is the inspection result normal?

YES

Perform the 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.

   Mass air flow 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 7.

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 8.

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
   E64	2	F78	41	Existed

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

Is the inspection result normal?

YES

GO TO 9.

NO

Repair or replace error-detected parts.

Check intake air temperature sensor. Refer to Component Inspection (Intake Air Temperature Sensor) .

Is the inspection result normal?

YES

GO TO 10.

NO

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

Check the PCV valve. Refer to Inspection .

Is the inspection result normal?

YES

GO TO 11.

NO

Replace PCV valve.

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

GO TO 12.

Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 13.

NO

Replace EVAP control system pressure sensor. Refer to Removal and Installation .

Perform EVAP leak check. Refer to Inspection .

GO TO 14.

Check mass air flow sensor. Refer to Component Inspection (Mass Air Flow Sensor) .

Is the inspection result normal?

YES

INSPECTION END

NO

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