Toyota Corolla Cross: Control Module Communication Bus Off (U0073,U0100,U0126,U0129)
DESCRIPTION
When the signal sent from the 4WD ECU assembly does not finish sending, the 4WD
ECU assembly stores a DTC.
When a malfunction occurs in communication with the ECM, skid control ECU (brake
actuator assembly) and steering sensor, the 4WD ECU assembly stores a DTC.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
|
U0073
|
Control Module Communication Bus Off
|
- With the ignition switch ON, sending of the signal from the 4WD
ECU assembly does not complete for 5 seconds or more.
- When the following occurs 10 times consecutively:
- A communication malfunction (bus off) occurs one or more times
within 0.1 seconds.
|
- CAN communication system
- 4WD ECU assembly
|
|
U0100
|
Lost Communication with ECM / PCM "A"
|
When both of the following continue for 2 seconds or more:
- The ignition switch is ON and the voltage of the IG1 terminal is
10 V or more.
- At a vehicle speed of 60 km/h (37 mph) or more, signals cannot be
received from the ECM.
|
- CAN communication system
- 4WD ECU assembly
- ECM
|
|
U0126
|
Lost Communication with Steering Angle Sensor Module
|
- When the IG1 terminal voltage is 10 V or more, communication with
the steering sensor is impossible for 1 second or more.
- When all of the following occur 10 times consecutively within 60
seconds:
- The voltage of the IG1 terminal is 10 V or more.
- The condition that communication with the steering sensor cannot
be performed occurs once within 5 seconds.
|
- CAN communication system
- 4WD ECU assembly
- Steering sensor
|
|
U0129
|
Lost Communication with Brake System Control Module
|
When the IG1 terminal voltage is 10 V or more, communication with the
skid control ECU (brake actuator assembly) is impossible for 3 seconds or
more.
|
- CAN communication system
- 4WD ECU assembly
- Skid control ECU (brake actuator assembly)
|
PROCEDURE
(a) Check for DTCs.
Chassis > Four Wheel Drive > Trouble Codes
(b) Record the output DTCs (dynamic torque control AWD system).
HINT:
When DTCs indicating a CAN communication system malfunction are output, repair
the CAN communication system before repairing each corresponding sensor.
| NEXT |
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GO TO CAN COMMUNICATION SYSTEM
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READ NEXT:
DESCRIPTION
The 4WD ECU assembly is connected to the combination meter assembly via the CAN
communication system.
If the 4WD ECU assembly stores any DTCs which are related to the dynamic torque
DESCRIPTION
Refer to "AWD Warning Light Remains ON".
Click here
WIRING DIAGRAM
Refer to "AWD Warning Light Remains ON".
Click here
CAUTION / NOTICE / HINT
Refer to &
SEE MORE:
DESCRIPTION
When the ignition switch is ON, auxiliary battery voltage is applied to terminal
MREL of the ECM through the coil of the EFI-MAIN relay. This causes the EFI-MAIN
relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
Refer to DTC U010087.
Click here
CAU
CHARGING CAUTION / NOTICE / HINT
CAUTION:
Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the repair manual.
Click here
To prevent electric shock, wear insulated gloves when working on wire
