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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
U2443 57CAN comm err (PHEV-ECU)
[Controller area network communication error (PHEV-ECU)]
Diagnosis condition READY Indicator: ON
Signal (terminal) —
Threshold MAC communication error
Diagnosis delay time 2 seconds or more
 
 
POSSIBLE CAUSE
  • MAC communication error
  • ADAS control unit 2 used in other vehicles is installed in the vehicle
  • ADAS control unit 2
  • PHEV-ECU
 
 
FAIL-SAFE
The following systems are canceled.
  • Vehicle-to-vehicle distance control mode
  • Conventional (fixed speed) cruise control mode
  • Steering wheel assistance function
  • FCM
  • Rear AEB
  • LDW
  • LDP
  • BSW
  • Active Blind Spot Assist [ABSA]
  • RCTA
  • TSR
 
 
CONFIRMATION PROCEDURE
1.CHECK DTC PRIORITY
If DTC “U2443-57” is displayed with DTC “U1327-52” or “U1327-54”, first perform the trouble diagnosis for DTC “U1327-52” or “U1327-54”.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to the following.
 
2.CHECK DIAGNOSTIC TROUBLE CODE
With M.U.T.-III SE
  1. Turn the electric motor switch ON.
  2. Perform "Diagnostic Trouble Code" mode of “ICC/ADAS 2” using M.U.T.-III SE.
Is DTC “U2443-57” detected?
Refer to DTC Diagnosis ProcedureDiagnosis Procedure.
-1 To check malfunction symptom before repair: Refer to Intermittent IncidentHOW TO COPE WITH INTERMITTENT MALFUNCTIONS.
-2 Confirmation after repair: INSPECTION END