Nissan Murano: Dtc/circuit Diagnosis / U0284 Active Grille Shutter

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

CHECK DTC PRIORITY

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

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index.

GO TO 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.

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?

Proceed to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

CHECK DTC PRIORITY

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

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index.

GO TO 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
   E238	1	Ground	Ignition switch: ON	Battery voltage
   			Ignition switch: OFF	0 V

Is the inspection result normal?

GO TO 4.

GO TO 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
   E238	1	F19	52	Existed

Is the inspection result normal?

Perform trouble diagnosis for power supply circuit.

Repair or replace the error-detected parts.

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
   E238	4	Ground	Existed

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

Is the inspection result normal?

GO TO 5.

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

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.

Is the inspection result normal?

GO TO 6.

Repair or replace the error-detected parts.

CHECK ACTIVE GRILLE SHUTTER

Check active grille shutter. Refer to Component Inspection (Active Grille Shutter).

Is the inspection result normal?

INSPECTION END

Replace active grille shutter. Refer to Removal and Installation.

CHECK ACTIVE GRILLE SHUTTER

With CONSULT

1. Start the engine.

2. Select “ACTIVE GRILLE SHUTTER” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

3. Touch “CALIBRTN”.

4. After the calibration completes, check the operation of active grille shutter as follows.

   Condition	Active grille shutter
   Select “CLOSE”	Close → Open
   Select “OPEN”	Open → Close

Without CONSULT

1. Turn ignition switch OFF.

2. Operate shutter by hands to close position.

3. Check the operation of active grille shutter as follows.

   Condition	Active grille shutter
   Ignition switch: ON	Close → Open

Is the inspection result normal?

INSPECTION END

Replace active grille shutter. Refer to Removal and Installation.