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DTC 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.
 
 
DTC DETECTION LOGIC
DTC No.M.U.T.-III SE screen items
(Trouble diagnosis content)
DTC detection condition
U2153-87CAN comm err (HVAC)
[Controller area network communication error (Heating ventilating and air-conditioning system)]
[MISSING MESSAGE]Diagnosis conditionWhen electric motor switch is ON.
Signal (terminal)CAN communication signal
ThresholdWhen IPDM E/R cannot communicate CAN communication signal
Diagnosis delay time2 seconds or more
 
 
POSSIBLE CAUSE
CAN communication system
 
 
FAIL-SAFE
 
 
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With M.U.T.-III SE
  1. Electric motor switch ON and wait for 2 seconds or more.
  2. Check "Diagnostic Trouble Code" of “IPDM E/R” using M.U.T.-III SE.
Is DTC detected?
-1 To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2 Confirmation after repair: INSPECTION END