The 4WD ECU assembly inputs the signals sent from the ECM, skid control ECU (brake actuator assembly) and steering sensor via CAN communication.
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U0073 | Control Module Communication Bus Off | 1.
When the following continues for 5 seconds or more: -
Signals from the 4WD ECU assembly are not received. 2.
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" | 1.
When both of the following continue for 2 seconds or more: -
The voltage of the IG1 terminal is 10 V or more. -
At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed. |
·
CAN communication system ·
4WD ECU assembly ·
ECM |
| U0126 | Lost Communication with Steering Angle Sensor Module | 1.
When both of the following continue for 1 second or more: -
The voltage of the IG1 terminal is 10 V or more. -
Communication with the steering sensor cannot be performed. 2.
When all of the following occur 10 times or more 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 | 1.
When both of the following continue for 3 seconds or more: -
The voltage of the IG1 terminal is 10 V or more. -
Communication with the skid control ECU (brake actuator assembly) cannot be performed. |
·
CAN communication system ·
4WD ECU assembly ·
Skid control ECU (brake actuator assembly) |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | One or more times within 0.1 seconds. | - | ○ |
| Malfunction Status | Signals from the 4WD ECU assembly are not received. | ○ | - |
| A communication malfunction (bus off) occurs. | - | ○ | |
| Detection Time | 5 seconds or more | 10 times consecutively | |
| Number of Trips | 1 trip | 1 trip | |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | The voltage of the IG1 terminal is 10 V or more. | ○ | ○ |
| Malfunction Status | Communication with the steering sensor cannot be performed. | ○ | - |
| The condition that communication with the steering sensor cannot be performed occurs once within 5 seconds. | - | ○ | |
| Detection Time | 1 second or more | 10 times or more within 60 seconds | |
| Number of Trips | 1 trip | 1 trip | |
Check for DTCs.
Record the output DTCs (dynamic torque control AWD system).
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
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