PR25DD engine

If DTC P044A is displayed with DTC P0643, first perform trouble diagnosis for DTC P0643.

Is applicable DTC detected?

YES

Perform diagnosis of applicable. Refer to DTC Index .

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect EGR volume control valve harness connector.
3. Turn ignition switch ON.
4. Check voltage between EGR volume control valve harness connector and ground.

   +		-	Voltage (Approx.)
   EGR volume control valve
   Connector	Terminal
   F113	3	Ground	5 V

Is the inspection result normal?

YES

GO TO 3.

NO

Perform the trouble diagnosis for power supply circuit.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between EGR volume control valve harness connector and ECM harness connector.

   EGR volume control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F113	2	F90	79	Existed

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

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.

1. Check harness continuity between EGR volume control valve harness connector and ECM harness connector.

   EGR volume control valve		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F113	1	F90	78	Existed

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

Is the inspection result normal?

YES

GO TO 5.

NO

Repair or replace error-detected parts.

Check the EGR volume control valve. Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Inspection .

NO

Replace EGR volume control valve. Refer to EGR VALVE : Removal & Installation .