PRECAUTION
- IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this information. Expression Switch (Position) Engine Switch (Condition) Ignition switch off LOCK Off Ignition switch ACC ACC On (ACC) Ignition switch ON ON On (IG) Engine start START Start
- TROUBLESHOOTING PRECAUTION NOTE: Since the Active Torque Control 4WD system may be influenced by a malfunction in other systems, be sure to check for DTCs in the other systems. When removing and installing the 4WD control ECU and each sensor, be sure to check that the normal display is output in test mode inspection and in DTC output inspection after installing all the parts. If the DTC of the CAN communication line is output, repair the malfunction in the communication line and troubleshoot the Active Torque Control 4WD system. Since the CAN communication line has its own length and route, it cannot be repaired temporarily with a bypass wire, etc.
Scheme 112
Scheme 113
Scheme 114
| Transmitting ECU | Receiving ECU | Signal | Communication Method |
|---|---|---|---|
| Skid control ECU | 4WD control ECU | Wheel speed sensor signal Stop light switch signal Deceleration sensor signal | CAN communication system |
| ECM | 4WD control ECU | Shift position sensor signal Throttle position sensor signal Crankshaft position sensor signal | CAN communication system |
| Main body ECU | 4WD control ECU | Parking brake switch signal | CAN communication system |
| 4WD control ECU | Combination meter | AWD warning light signal | CAN communication system |
COMMUNICATION TABLE
FAIL-SAFE CHART
- FAIL-SAFE FUNCTION If the following malfunctions occur, the 4WD control ECU will stop the function of AWD control system or partly change the function to control the system. If a malfunction occurs in the sensor signal or actuator, the flow of electricity to the electromagnetic solenoid of the electromagnetic control coupling is prohibited. As a result, the system enters front wheel drive condition. When a component of the system malfunctions and the fail-safe function activates, the component operation is prohibited. However, if the system is controlling the component and the fail-safe function activates, the system operation is gradually stopped to prevent sudden changes in the vehicle condition. When system control is not possible, the warning light is illuminated to stop operation of the system operation.