DESCRIPTION
If a malfunction in the power source circuit occurs or when a malfunction in communication with the skid control ECU or in a speed sensor occurs, the 4WD control ECU will prohibit operations using a fail-safe function. Refer to DIAGNOSIS SYSTEM [08/2012 - ] .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1241/94 | When the following continues for 10 seconds or more: At a vehicle speed of 2 mph (3 km/h) or more, the voltage of IG1 terminal is 9.5 V or less. When either of the following is detected: With the IG1 terminal voltage 9.5 V or less, communication with the skid control ECU is impossible. Vehicle speed sensor voltage is reduced for 60 seconds or more. When the following continues for 3 seconds or more: With the IG1 terminal voltage 17 V or more, communication with the skid control ECU is impossible. | Battery ECU-IG RH fuse Wire harness (IG1 circuit, GND circuit) CAN communication system 4WD control ECU |
Scheme 155
Scheme 155: WIRING DIAGRAM
If a malfunction in the speed sensor signal circuit occurs, the 4WD control ECU will output this DTC. When slip is detected based on signals sent from the 4 wheel speed sensors, the 4WD control ECU controls torque distribution between front and rear wheels according to the amount of slip.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1296/96 | When condition below is met: Wheel speed sensor malfunction is received from skid control ECU | Brake control system (speed sensor circuit) CAN communication system 4WD control ECU |
Scheme 156
Scheme 156: WIRING DIAGRAM
- The 4WD control ECU determines that the vehicle is turning based on the signal sent from the steering angle sensor.
- The steering angle sensor signal is sent to the 4WD control ECU via the CAN communication system.
- The 4WD control ECU detects the amount of steering wheel movement and performs "slip control at vehicle start up", according to the amount of movement, and "slip control" to secure high turning performance.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1297/97 | When the voltage of the 4WD control ECU IG1 terminal is 9.5 V or more, the steering angle sensor malfunction signal is received. | Steering angle sensor CAN communication system Brake control system 4WD control ECU |
Scheme 157
Scheme 157: WIRING DIAGRAM
The 4WD control ECU receives signals from each sensor to control clutch fluid pressure to limit the center differential operation, distributing torque according to the driving conditions.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1298/98 | When all of the following are detected: IG1 terminal voltage is 9.5 V or more Operation command current for the linear solenoid (transfer control solenoid) is 3.5 A or more. Open or short in the SLC+ or SLC- circuit continues for 1 second or more. | Transfer transmission wire Wire harness Transfer control solenoid assembly 4WD control ECU |
Scheme 158
Scheme 158: WIRING DIAGRAM
- If wheel slip continues, differential control will be disabled when the torque-distribution ratio of the differential clutch exceeds the set value and a malfunction in the output of the wheel speed sensors, etc. occurs.
- If a difference in diameter between the front and rear wheels is determined, differential control will be disabled.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1299/99 | When either of the following are detected: The torque-distribution ratio of the differential clutch exceeds the set value. The vehicle is driven with tires different in size between the front and rear. | Tire size 4WD control ECU |
- The 4WD control ECU inputs the signals sent from the ECM, skid control ECU, and steering angle sensor via the CAN communication system.
- When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| U0073/86 | When the following continues for 5 seconds or more: Signals from the 4WD control ECU are not received. When the following occurs 10 times consecutively: A communication malfunction (bus off) occurs one or more times within 0.1 second. | Wire harness (CANL, CANH circuit) 4WD control ECU |
| U0100/85 | 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 38 mph (60 km/h) or more, communication with the ECM cannot be performed continue for 2 seconds or more. | Wire harness (CANL, CANH circuit) 4WD control ECU ECM |
| U0126/84 | 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 angle sensor cannot be performed. When both of the following occur 10 times consecutively: The voltage of the IG1 terminal is 10 V or more. The condition that communication with the steering angle sensor cannot be performed occurs once within 5 seconds. | Wire harness (CANL, CANH circuit) 4WD control ECU Steering angle sensor |
| U0129/83 | 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 cannot be performed. | Wire harness (CANL, CANH circuit) 4WD control ECU Skid control ECU |
Connecting terminals TC and CG of the DLC3 causes the 4WD control ECU to display a DTC on the multi-information display.
Scheme 159
Scheme 159: WIRING DIAGRAM
