DTC Description

DTC DETECTION LOGIC

DTC Description		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
U2154	87	CAN comm err (MIU) [Controller area network communication error (Multimedia interface unit)]	1	Diagnosis condition	Electric motor switch ON Power supply voltage is normal
				Signal (terminal)	CAN communication signal
				Threshold	The CAN communication signals are not continuously sent to the MIU.
				Diagnosis delay time	2 seconds or more
			2	Diagnosis condition	Electric motor switch ON Power supply voltage is normal
				Signal (terminal)	CAN communication signal
				Threshold	The CAN communication signals are not continuously received from the MIU.
				Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

note	Confirm if DTC is Stored DTC or Active DTC. If DTC is Active DTC, proceed with Diagnosis Procedure. If DTC is Stored DTC, clear DTC. Do not replace the ABS actuator and electric unit (control unit) for a Stored DTC DTC.

Stored DTC DTC	Active DTCDTC
Harness or connector CAN communication line	CAN communication system

FAIL-SAFE

Normal condition

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn the electric motor switch OFF (Auto ACC function OFF) before conducting the next test.

2.CHECK DTC DETECTION

M.U.T.-IIISE

Change the power supply mode of the electric motor switch to OFF (Auto ACC function OFF).
Change the power supply mode of the electric motor switch is ON (READY indicator: ON)
note Wait at least 10 seconds after change the electric motor switch to ON,
Perform Diagnostic Trouble Code for “ABS".

Is DTC "U2154-87" detected?

-1"Active DTC" is displayed. Refer to Diagnosis Procedure

-2“Stored DTC" is displayed: INSPECTION END (Erase the memory of Diagnostic Trouble Code results.)

-1To check malfunction symptom before repair: Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS

. Refer to Intermittent Incident

-2Confirmation after repair: INSPECTION END