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DTC Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, 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
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U012200ASC MDL
(Lost communication with vehicle dynamics control module)
Diagnosis conditionIgnition switch ON
Signal (terminal)CAN communication signal
ThresholdWhen ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) with ABS actuator and electric unit (control unit)
Diagnosis delay time2 seconds or more
 
 
POSSIBLE CAUSE
Harness or connectors (CAN communication line is open or shorted)
 
 
FAIL-SAFE
Engine operating condition in fail-safe mode
Fail safe modeVehicle behavior
Traveling control modeAccelerator angle variation controlECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction.
noteECM does not control the accelerator pedal releasing speed.
Combustion control modeStratified charge combustion control at startingNo stratified charge combustion at starting (cold start).
 
 
DTC Confirmation Procedure
1.PERFORM DTC CONFIRMATION PROCEDURE
  1. Turn ignition switch ON and wait at least 3 seconds.
  2. Check 1st trip DTC.
Is 1st trip DTC detected?
Refer to DTC Diagnosis Procedure.
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: INSPECTION END