Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / U0284 Active Grille Shutter

Nissan Sentra B18 (2020-2025) Service Manual: U0284 Active Grille Shutter

Dtc Description

DTC Description

DTC DETECTION LOGIC

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

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition
U0284	LOST COMM (A/GRLL SHTTR MDL A) (Lost communication with active grille air shutter module A)	ECM cannot receive the engine communication signal from active grille shutter

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

U0284

LOST COMM (A/GRLL SHTTR MDL A)

(Lost communication with active grille air shutter module A)

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

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Sentra Vehicle behavior
Others		ECM operates active grille shutter to fully-open position.

Idle Start/Stop System

Not applicable

Confirmation Procedure

Confirmation Procedure

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.
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?
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

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.

CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY

Turn ignition switch OFF.
Disconnect active grille shutter harness connector.

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
E53	1	Ground	Ignition switch: OFF	0 V

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

GO TO 3.

CHECK ACTIVE GRILLE SHUTTER POWER SUPPLY CIRCUIT

Turn ignition switch OFF
Disconnect IPDM E/R harness connector.

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	Continuity
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.

CHECK ACTIVE GRILLE SHUTTER GROUND CIRCUIT

Turn ignition switch OFF

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

Active grille shutter		−	Continuity
Connector	Terminal	−	Continuity
E53	4	Ground	Existed

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.

CHECK ACTIVE GRILLE SHUTTER INPUT SIGNAL CIRCUIT

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

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

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace the error-detected parts.

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.

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