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DTC Description
 
 
DESCRIPTION
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 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. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.
 
 
DTC DETECTION LOGIC
DTC No.Scan tool (M.U.T.-III SE) screen items
(Trouble diagnosis content)
DTC Detection Condition
U2148-87CAN comm err (brake control unit)
[CAN communication error (brake control unit)]
Diagnosis conditionElectric motor switch ON
Signal (terminal)CAN communication signal
ThresholdTransmission error or reception error
Diagnosis delay time2 seconds or more
 
 
POSSIBLE CAUSE
CAN communication system
 
 
FAIL-SAFE
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DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAG RESULT
With scan tool (M.U.T.-III SE)
  1. Turn the power supply mode of the electric motor switch to ON and wait for 2 seconds or more.
  2. Check “Diagnostic Trouble Code” mode of “HANDS FREE MODULE” using scan tool (M.U.T.-III SE).
Is DTC detected?
Refer to DTC Diagnosis Procedure.
-1To check malfunction symptom before repair: Refer to Intermittent IncidentHOW TO COPE WITH INTERMITTENT MALFUNCTIONS.
-2Confirmation after repair: INSPECTION END