DTC Description

DTC DETECTION LOGIC

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

DTC No.		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detecting condition
U0284	00	LOST COMM (A/GRLL SHTTR MDL A) (Lost communication with active grille air shutter module A)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	Engine communication signal
			Threshold	ECM cannot receive the engine communication signal from active grille shutter
			Diagnosis delay time	—

POSSIBLE CAUSE

Harness and connectors (Engine communication line is open or circuit shorted.)
Active grille shutter

FAIL-SAFE

Not applicable

DTC 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?

Perform diagnosis of applicable. Refer to DTC Index

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.

3.PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait at least 5 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected?

Refer to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END