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 Condition | Trouble Area |
|---|---|---|
| C1241/94 | When one of the 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 the 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-IG NO. 1 fuse Wire harness (IG1 circuit, GND circuit) 4WD control ECU |
Scheme 122
If a malfunction in the ECM circuit occurs, the 4WD 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 ECM 4WD Control ECU |
If a malfunction in the speed sensor signal circuit yaw rate and acceleration sensor circuit occurs, the 4WD control ECU will output this DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1296/96 | When one of the following condition is met: Wheel speed sensor malfunction is received from the skid control ECU Yaw rate and acceleration sensor malfunction is received from skid control ECU | Speed sensor Wire harness Skid control ECU 4WD control ECU Yaw rate and acceleration sensor |
The 4WD 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 linear solenoid circuit occurs. | 4WD fuse Wire harness Electromagnetic control coupling 4WD control ECU |
Scheme 123
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Scheme 125
Scheme 126
- INSPECT FUSE (4WD FUSE) Remove the 4WD fuse from the instrument junction block. Measure the resistance of the fuse. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Always Below 1 ohms HINT: Check for short circuits in all harnesses and connector connected to the 4WD fuse. Refer to «PRECAUTION»(ref-427305-S14224765222011101200000). NG --> REPLACE FUSE (4WD) OK: Go to next step
- CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY) Disconnect the ECU connector. Measure the voltage of the wire harness side connector. Standard Voltage Tester Connection Condition Specified Condition E17-9 (BSLC) - Body Ground Ignition switch ON 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- INSPECT ELECTROMAGNETIC CONTROL COUPLING (4WD LINEAR SOLENOID) Remove the coupling connector. Measure the resistance of the solenoid. Standard Resistance Tester Connection Condition Specified Condition 1 (BSF) - 2 (SLC) Always 2.2 to 2.6 ohms 1 (BSF) - Body ground Always 10 kohms or higher 2 (SLC) - Body ground Always 10 kohms or higher NG --> See step 5 OK: Go to next step
- CHECK WIRE HARNESS (ELECTROMAGNETIC CONTROL COUPLING - 4WD CONTROL ECU) Disconnect the ECU connector. Measure the resistance of the wire harness side connector. Standard Resistance Tester Connection (4WD Control ECU - 4WD Linear solenoid) Condition Specified Condition E17-13 (SLC+) - 1 (BSF) Always Below 1 ohms E17-32 (SLC-) - 2 (SLC) Always Below 1 ohms E17-13 (SLC+) - Body ground Always 10 kohms or higher E17-32 (SLC-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
- REPLACE ELECTROMAGNETIC CONTROL COUPLING. Refer to «DISASSEMBLY»(ref-427524-S07081355142011101200000)
- REPLACE 4WD CONTROL ECU. Refer to «REMOVAL»(/toyota/matrix/e140-2008-2014/remont/transfer-case/#transfer-case-service-information)
- 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 4WD control ECU |
- The 4WD 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 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 seconds. | 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 |
| 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 warning light comes on in the combination meter.
Scheme 127
Refer to "4WD Warning Light Remains ON". Refer to DESCRIPTION.
Connecting terminals TC and CG of the DLC3 causes the 4WD control ECU to display 2-digit DTCs by flashing the 4WD warning light.
HINT
When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
Scheme 128
See also:
• REMOVAL
• INSPECTION