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 4WD control ECU will prohibit operations by the fail-safe function.
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| C1241/94 | When one of following conditions is met: When following continues for 10 seconds or more: At a vehicle speed of 3 km/h (2 mph) or more, voltage of IG1 terminal is 9.5 V or less. When both of following continue for 60 seconds or more: With the voltage of IG1 terminal 9.5 V or less, communication with the skid control ECU cannot be performed. A malfunction in communication with skid control ECU. When following continue for 3 seconds or more: With the voltage of IG1 terminal 9.5 V or more, communication with the skid control ECU cannot be performed. | Battery Generator ECU-IG1 Wire harness (IG1 circuit, GND circuit) 4WD control ECU |
DIAGNOSTIC TROUBLE CODE CHART
Scheme 1
If a malfunction in the engine control ECU circuit occurs, the 4WD control ECU will output this DTC.
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| C1280/82 | When the following continues for 5 seconds or more: Communication with engine control ECU is operating normally, but throttle position sensor is malfunctioning. | Throttle position sensor Throttle position sensor wire harness and connector CAN communication system |
DTC DETECTION CONDITION
If a malfunction in the speed sensor signal circuit yaw rate sensor circuit occurs, the 4WD control ECU will output this DTC.
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| C1296/96 | When either condition below is met: Wheel speed sensor malfunction is received from skid control ECU Deceleration sensor malfunction us received from skid control ECU | CAN communication line Skid control ECU Speed sensor 4WD control ECU Yaw rate sensor Wire harness |
DTC DETECTION CONDITION
- The 4WD control ECU determines that the vehicle is turning based on the signals 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 DETECTION CONDITION DTC No. DTC Detection Conditions Trouble Areas C1297/97 When voltage of 4WD control ECU IG1 terminal is 9.5 V or more, and steering angle sensor malfunction signal is received. Steering angle sensor CAN communication 4WD control ECU Wire harness
Scheme 2
The 4WD control ECU receives signals from each sensor to control clutch fluid pressure for limiting the center differential operation, which distributes torque according to the driving conditions.
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| 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 linear solenoid circuit occurs. | Wire harness Electromagnetic coupling 4WD control ECU |
DTC DETECTION CONDITION
Scheme 3
Scheme 4
Scheme 5
- INSPECT ELECTROMAGNETIC COUPLING (4WD LINEAR SOLENOID) Remove the coupling connector. Measure the resistance of the solenoid. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 1 (BSF) - 2 (SLC) 2.2 to 2.6 ohms 1 (BSF) - Body ground 10 kohms or higher 2 (SLC) - Body ground 10 kohms or higher NG: REPLACE ELECTROMAGNETIC COUPLING OK: GO TO NEXT STEP.
- CHECK WIRE HARNESS (COUPLING - 4WD CONTROL ECU) Disconnect the E57 ECU connector. Measure the resistance of the wire harness side connector. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition E57-13 (SLC+) - Q1-1 (BSF) Below 1 ohms E57-32 (SLC-) - Q1-2 (SLC) Below 1 ohms E57-13 (SLC+) - Body ground 10 kohms or higher E57-32 (SLC-) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE 4WD CONTROL ECU
- 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 DETECTION CONDITION DTC No. DTC Detection Conditions Trouble Areas C12299/99 When one of following following conditions is met: Control coupling lock is detected 4 more times. Condition that controls coupling calorific value is predefined value or more. Condition that transfer oil temperature is predefined value or more. Vehicle is driven and energy load tire radius difference between front tires and rear tires is more than 3% Electromagnetic coupling 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 DETECTION CONDITION DTC No. DTC Detection Conditions Trouble Aria 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 60 km/h (38 mph) or more, communication with the ECM cannot be performed 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 all of the following occur 10 times consecutively: The condition that communication with the steering angle sensor cannot be performed occurs once within 5 seconds The voltage of the IG1 terminal is 10 V or more. Occurs 10 times or more within 60 seconds. Wire harness (CANL, CANH circuit) 4WD control ECU Steering angle sensor 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. Wire harness (CANL, CANH circuit) 4WD control ECU Skid control ECU
The 4WD control ECU is connected to the combination meter via the CAN communication system.
If the 4WD control ECU stores any DTCs which are related to the active torque control 4WD system, the 4WD indicator light comes on in the combination meter.
Scheme 6
Scheme 7
Refer to " 4WD INDICATOR LIGHT REMAINS ON ".
Connecting terminals TC and CG of the DLC3 causes the 4WD control ECU to display 2-digit DTCs by flashing the 4WD indicator light.
