Nissan Ariya: U2140-87 Can Comm Circuit

• Driver Seat Control Unit

Driver Seat Control Unit

DTC Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Ariya vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Ariya 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.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items	DTC detection condition
U2140-87	CAN communication error (ECM)	Diagnosis condition	When power switch is ON
		Signal (terminal)	CAN communication signal
		Threshold	When driver seat control unit cannot communicate CAN communication signal
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

Only manual function can be operated

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Power switch ON and wait for 2 seconds or more.

2. Check “Self Diagnostic Result” of “DRIVER SEAT” using CONSULT.

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO-1 >>

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

NO-2 >>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK CAN COMMUNICATION SYSTEM

Perform trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

>>

INSPECTION END