PR25DD engine

If DTC U0284 is displayed with another DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.

Is applicable DTC detected?

YES

Perform diagnosis of applicable. Refer to DTC Index .

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect active grille shutter harness connector.
3. Turn ignition switch ON.
4. Check the voltage between active grille shutter harness connector and ground as follows.

   +		-	Condition	Voltage (Approx.)
   Active grille shutter
   Connector	Terminal
   E249	4	Ground	Ignition switch: ON	Battery voltage
   			Ignition switch: OFF	0 V

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

1. Turn ignition switch OFF
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between active grille shutter harness connector and IPDM E/R harness connector.

   Active grille shutter		IPDM E/R		Continuity
   Connector	Terminal	Connector	Terminal
   E249	4	F10	78	Existed

Is the inspection result normal?

YES

Perform trouble diagnosis for power supply circuit.

NO

Repair or replace the error-detected parts.

1. Turn ignition switch OFF
2. Check the continuity between active grille shutter harness connector and ground.

   Active grille shutter		-	Continuity
   Connector	Terminal
   E249	1	Ground	Existed

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

Is the inspection result normal?

YES

GO TO 5.

NO

Repair open circuit, short to ground or short to power in harness or connectors.

1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and active grille shutter harness connector.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace the error-detected parts.

Check active grille shutter. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace active grille shutter. Refer to Removal & Installation .