DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart

DTC DETECTION LOGIC

DTC No.	Scan tool (M.U.T.-III SE) screen items (Trouble diagnosis content)	DTC Detection Condition
U2140-87	CAN comm err (ECM) [CAN communication error (ECM)]	Diagnosis condition	Electric motor switch ON
		Signal (terminal)	CAN communication signal
		Threshold	Transmission error or reception error
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

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DTC CONFIRMATION PROCEDURE

1.CHECK SELF-DIAG RESULT

With scan tool (M.U.T.-III SE)

Turn the power supply mode of the electric motor switch to ON and wait for 2 seconds or more.
Check “Diagnostic Trouble Code” mode of “HANDS FREE MODULE” using scan tool (M.U.T.-III SE).

Is DTC detected?

Refer to Diagnosis Procedure

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

-2Confirmation after repair: INSPECTION END