Nissan Sentra B18 (2020-2025) Service Manual: U2140-87 Can Comm Err (ecm)

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Manual Air Conditioner / Dtc/circuit Diagnosis / U2140-87 Can Comm Err (ecm)

Dtc Description

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication system for real time application. It is an on-Nissan Sentra vehicle multiplex communication system with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto Nissan Sentra vehicles, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with two communication lines (CAN-High line, CAN-Low 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 How To Use CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U2140-87	CAN comm err (ECM) [CAN communication error (ECM)]	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	CAN communication signal
		Threshold	A/C amp. is not transmitting or receiving CAN communication signal
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

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Confirmation Procedure

Confirmation Procedure

PERFORM SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “HVAC”.
  3. Check DTC.
Is DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK CAN COMMUNICATION SYSTEM
1. Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
>>
Inspection End.

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