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DTC Description
 
 
CAN COMMUNICATION
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 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 M.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U2175 87 CAN comm err (Multi Around Monitor)
[Controller area network communication error (Around view monitor)]
Diagnosis condition
  • When engine is running
  • When AEB system is ON
Signal (terminal) CAN communication signal
Threshold If ADAS control unit 2 is not transmitting or receiving CAN communication signal
Diagnosis delay time 2 seconds or more
noteIf “U2175-87” is detected, first diagnose the CAN communication system.
 
 
POSSIBLE CAUSE
CAN communication system
 
 
FAIL-SAFE
None
noteWith the detection of “U2175-87” 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
1.PERFORM DTC CONFIRMATION PROCEDURE
  1. Start the engine.
  2. Turn the AEB system ON.
  3. Perform “Read All DTCs” with M.U.T.-III SE.
  4. Check if the “U2175-87” is detected as the current malfunction in “Self Diagnostic Result” of “ACC/ADAS 2”.
Is “U2175-87” detected as the current malfunction?
Refer to DTC Diagnosis ProcedureDiagnosis Procedure .
-1 To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2 Confirmation after repair: INSPECTION END