[Previous][Next]
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
U0073-00Control module comm Bus A Off
(Control module communication Bus A Off)
[NO SUBTYPE INFO]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
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN communication recovers normally, it also returns to normal control.
 
 
If No CAN Communication Is Available With BCM
Control partFail-safe operation
Headlight
  • Turns ON the headlight (LO) when the electric motor switch is turned ON.
  • Turns OFF the headlight (LO) when the electric motor switch is turned OFF.
  • Headlight (HI): OFF
  • Parking light
  • License plate light
  • Tail light
  • Side marker light
  • Illumination
  • Turns ON the tail light, parking light, license plate light, side marker light and each illumination when the electric motor switch is turned ON.
  • Turns OFF the tail light, parking light, license plate light, side marker light and each illumination when the electric motor switch is turned OFF.
Front wiper
  • The status just before activation of fail-safe control is maintained until the electric motor switch is turned OFF while the front wiper is operating at LO or HI speed.
  • The wiper is operated at LO speed until the electric motor switch is turned OFF if the fail-safe control is activated while the front wiper is set in the INT mode and the front wiper motor is operating.
Daytime running lightDaytime running light: OFF
Front fog lightFront fog light: OFF
Ignition relayThe status just before activation of fail-safe is maintained.
Starter motorStarter relay: OFF
 
 
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