DESCRIPTION
If a malfunction in the power source circuit occurs, or a malfunction in communication with the skid control ECU or in a speed sensor occurs, the AWD control ECU will prohibit operations by the fail-safe function.
| 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 IG1 terminal voltage 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: The IG1 terminal voltage 17 V or more. | Battery ECU-IG No. 1 fuse Wire harness and connector (IG1 circuit, GND circuit) Brake control system CAN communication system AWD control ECU |
Scheme 125
If a malfunction in the deceleration sensor circuit occurs, the AWD control ECU will output this DTC.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| C1296/96 | When the following condition is met: - Deceleration sensor malfunction is received from the skid control ECU. | Brake control system (deceleration sensor circuit) AWD control ECU |
If a malfunction in the ECM circuit occurs, the AWD control ECU will output this DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1280/82 | When the following continues for 5 seconds or more: - Communication with engine control ECM is operating normally, but SFI system is malfunctioning. | SFI system AWD control ECU |
If a malfunction in the speed sensor signal circuit occurs, the AWD control ECU will output this DTC.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| C1296/96 | When condition is met: - Wheel speed sensor malfunction is received from the skid control ECU. | Brake control system (speed sensor circuit) AWD control ECU |
The AWD control ECU receives signals from each sensor to control clutch pressure to distribute torque according to the driving conditions.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1298/98 | When the following continues for 1 second or more: - With the current of the 0.8 A or more, an open or short in the electromagnetic solenoid circuit occurs. | 4WD fuse Wire harness and connector Electromagnetic control coupling AWD control ECU |
Scheme 126
- 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 Detection Condition | Trouble Area |
|---|---|---|
| C1299/99 | When one of the following conditions is met: - Condition that controls coupling calorific value is predefined value or more. - Vehicle is driven and energy load tire radius difference between front tires and rear tires is more than 3%. | Tire size AWD control ECU |
- The AWD control ECU inputs the signals sent from the ECM and skid control ECU 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 Detection Condition | Trouble Area |
|---|---|---|
| U0073/86 | When the following continues for 5 seconds or more: - Signals from the AWD 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 seconds. | CAN communication system |
| 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 60 km/h (38 mph) or more, communication with the ECM cannot be performed. | CAN communication system |
| U0129/83 | When the following continues 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. | CAN communication system |
The AWD control ECU is connected to the combination meter via the CAN communication system.
If the AWD control ECU stores any DTCs which are related to the active torque control 4WD system, the AWD warning light comes on in the combination meter.
Scheme 127
Refer to "AWD Warning Light Remains ON". Refer to DESCRIPTION.
Connecting terminals TC and CG of the DLC3 causes the AWD control ECU to display 2-digit DTCs by flashing the AWD warning light.
HINT
When each warning light remains blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal short to ground in each ECU is suspected.
Scheme 128
See also:
• INSPECTION - Step 1