Dtc Description

DTC Description

DTC DETECTION LOGIC

When ECM cannot receive the engine communication signal from active grille shutter.

POSSIBLE CAUSE

• Harness and connectors

  (Engine communication line is open or circuit shorted.)

• Active grille shutter

FAIL-SAFE

Engine Control System

Idle Start/Stop System

Not applicable

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   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.

2. PRECONDITIONING

   If another DTC Confirmation Procedure is conducted just before this procedure, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

   TESTING CONDITION:

   Before performing the following procedure, confirm that battery voltage is 10 V or more with ignition switch ON.

   >>

   GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

   1. Turn ignition switch ON and wait at least 5 seconds.

   2. Check 1st trip DTC.

   Is 1st trip DTC detected?

   YES >>

   Refer to DTC Diagnosis Procedure.

   NO-1 >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK DTC PRIORITY

   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.

2. CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect active grille shutter harness connector.

   3. Check the voltage between active grille shutter harness connector and ground as follows.

      +		−	Condition	Voltage (Approx.)
      Active grille shutter
      Connector	Terminal
      E53	1	Ground	Ignition switch: ON	Battery voltage
      			Ignition switch: OFF	0 V

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   GO TO 3.

3. CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY CIRCUIT

   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
      E53	1	F96	75	Existed

   Is the inspection result normal?

   YES >>

   Perform trouble diagnosis for power supply circuit.

   NO >>

   Repair or replace the error-detected parts.

4. CHECK ACTIVE GRILLE SHUTTER GROUND CIRCUIT

   1. Turn ignition switch OFF

   2. Check the continuity between active grille shutter harness connector and ground.

      Active grille shutter		−	Continuity
      Connector	Terminal
      E53	4	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.

5. CHECK ACTIVE GRILLE SHUTTER INPUT SIGNAL CIRCUIT

   1. Disconnect ECM harness connector.

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

   ECM		Active grille shutter		Continuity
   Connector	Terminal	Connector	Terminal
   F25	98	E53	3	Existed

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   Repair or replace the error-detected parts.

6. CHECK ACTIVE GRILLE SHUTTER

   Check active grille shutter. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Replace active grille shutter.