Nissan Versa (N17): U0140 Lost communication (BCM)

Nissan Versa 2nd generation (N17) Service Manual / Transmission & driveline / Transaxle & transmission (TM) / U0140 Lost communication (BCM)

Description

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

Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independently). 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 Logic

DTC DETECTION LOGIC

DTC Trouble diagnosis name DTC detection condition Possible causes

U0140

Lost Communication With Body Control Module When the ignition switch is ON, TCM is unable to receive the CAN communications signal from BCM continuously for 2 seconds or more.
  • BCM
  • Harness or connector (CAN communication line is open or shorted)

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

  1. Start the engine and wait for at least 5 seconds.
  2. Check the DTC.

Is "U0140" detected?

YES >> Go to TM "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

For the diagnosis procedure, refer to LAN "Trouble Diagnosis Flow Chart".

U0100 Lost communication (ECM A)

Description CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle multiplex communication line with high data communication speed and excelle ...

U0141 Lost communication (BCM A)

Description CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle multiplex communication line with high data communication speed and excellen ...

Other materials:

Keys
Type A (if so equipped) 1. Master key 2. Valet key 3. Key number plate A key number plate is supplied with your keys. Record the key number and keep it in a safe place (such as your wallet), not in the vehicle. If you lose your keys, it is recommended that you visit a NISSAN dealer for ...

Thermostat
Exploded View 1. Radiator hose (lower) 2. Water inlet 3. Rubber ring 4. Thermostat A. To radiator Removal and Installation WARNING: Do not remove the radiator cap when the engine is hot. Serious burns could occur from highpressure engine coolant escaping from the radiator. Wrap a thick cl ...

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