Nissan Rogue (T33) 2021-Present Service Manual: U19b1-87 Can Comm Circuit

Nissan Rogue (T33) 2021-Present Service Manual / Cruise Control & Driver Assistance :: Driver Assistance System / Adas Control Unit :: Dtc/circuit Diagnosis / U19b1-87 Can Comm Circuit

DTC Description

CAN COMMUNICATION

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 units, 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, CAN-L) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads the required data only.

CAN communication signal chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
U19B1 87 CAN communication error (CCM) Diagnosis condition When engine is running
Signal (terminal) CAN communication signal
Threshold If ADAS control unit 2 is not transmitting or receiving CAN communication signal
Diagnosis delay time 1 second or less

NOTE:

If “U19B1-87” is detected, first diagnose the CAN communication system.

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

The following systems are canceled.

  • Vehicle speed & vehicle-to-vehicle control function

  • Lane keep function*1

  • Lane keep function*2

  • Lane change support function

  • Overtaking support function

  • Route driving support function

  • FEB

  • RAB

  • PFCW

  • LDP

  • Blind Spot Intervention

  • TSR

*1: ProPILOT Assist 2.1 display is green

*2: ProPILOT Assist 2.1 display is blue

NOTE:

  • With the detection of “U19B1-87” some systems do not perform the fail-safe operation.

  • A system controlling based on a signal received from the control unit performs fail-safe operation when the communication with the ADAS control unit 2 becomes inoperable.

CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

  1. Start the engine.

  2. Perform “All DTC Reading” with CONSULT.

  3. Check if the “U19B1-87” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS 2”.

Is “U19B1-87” detected as the current malfunction?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

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

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

PERFORM DIAGNOSIS OF CAN COMMUNICATION CIRCUIT

Perform diagnosis of CAN communication circuit. Refer to Trouble Diagnosis Flow Chart .

>>

INSPECTION END

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