DESCRIPTION
This circuit is used to send TR(A)C and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) via CAN communication.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1203 | Engine, drive source and destination variations that are sent from the ECM do not match the ones of the skid control ECU (brake actuator assembly). | ECM |
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.
HINT
If there is a malfunction in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output. When U0124 is output together with C1210 and/or C1336, inspect and repair the trouble areas indicated by U0124 first.
These DTCs are also output when the calibration has not been completed.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1210 | Zero point calibration of yaw rate sensor undone. | Yaw rate sensor (Airbag sensor assembly) |
| C1336 | Zero point calibration of acceleration sensor undone. | Acceleration sensor (Airbag sensor assembly) |
These solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the braking force.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1225 | Any of the following is detected: While switching solenoid (SM1 or SM2) is on, overcurrent continues for 0.15 seconds or more. While switching solenoid (SM1 or SM2) is off, an open circuit continues for 0.05 seconds or more. While switching solenoid (SM1 or SM2) is on, an open circuit continues for 0.05 seconds or more. While switching solenoid (SM1 or SM2) is off, current continues to be applied for 0.1 seconds or more. Short to GND in the switching solenoid (SM1 or SM2) continues for 0.1 seconds or more. Switching solenoids SM1 and SM2 are shorted for 0.1 seconds or more. | Solenoid circuit Solenoid valve (Brake actuator assembly) |
| C1468 C1469 C146A C146B | Open or short in the solenoid circuit continues for 0.05 seconds or more. | Solenoid circuit Solenoid valve (Brake actuator assembly) |
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.
HINT
If there is a malfunction in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is output. When U0124 is output together with C1232, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 first.
DTCs may be stored if either of the following occurs
- Yaw rate and acceleration sensor (airbag sensor assembly) installation abnormality.
- Yaw rate and acceleration sensor signal malfunction.
DTC C1279 can be deleted when the yaw rate and acceleration sensor (airbag sensor assembly) sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279 is output only in Test Mode.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1232 | At a vehicle speed of 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 seconds or more. | Sensor installation Acceleration sensor (Airbag sensor assembly) |
| C1243 | While the vehicle speed changes from 30 km/h (19 mph) to 0 km/h (0 mph), the condition in which the value of the acceleration sensor does not change by 0.0294 G or more, occurs 16 times or more. | Sensor installation Acceleration sensor (Airbag sensor assembly) |
| C1245 | At a vehicle speed of 30 km/h (19 mph) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed sensor exceeds 0.35 G for 60 seconds or more. | Sensor installation Acceleration sensor (Airbag sensor assembly) |
| C1279 | Detected only during Test Mode. | Sensor installation Acceleration sensor (Airbag sensor assembly) |
If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.
This DTC is stored when the IG1 terminal voltage deviates from the DTC detection condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.
The DTC is canceled when the IG1 terminal voltage returns to normal.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1241 | Any of the following is detected: At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9.5 V for 10 seconds or more. When the solenoid relay remains on and the IG1 terminal voltage is less than 9.5 V, the relay contact is open for 0.22 seconds or more. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply decreases for 60 seconds or more. When the motor fail-safe relay is on after the motor relay turns on, the IG1 terminal voltage is 9.5 V or less and the actuator pump drive motor is off for 0.22 seconds or more. | ECU-IG1 NO. 1 fuse Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU (brake actuator assembly) |
Scheme 18
Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control system.
The speed sensor rotors have 48 serrations. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.
DTCs C1271, C1272, C1275 and C1276 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271, C1272, C1275 and C1276 are output only in Test Mode.
Scheme 19
HINT
Check the connection status between the sensor connector and the vehicle wire harness.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1413 C1414 | Any of the following is detected: An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more. | Front speed sensor RH/LH Speed sensor circuit Sensor installation Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH) Skid control ECU (Brake actuator assembly) |
| C1271 C1272 | Detected only during Test Mode. | Front speed sensor RH/LH Sensor installation Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH) |
| C1275 C1276 | Detected only during Test Mode. | Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH) |
HINT
- DTC C1413 is for the front speed sensor RH.
- DTC C1414 is for the front speed sensor LH.
Scheme 20
Each speed sensor detects the wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control system.
The speed sensor rotors have rows of alternating N and S magnetic poles. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.
DTCs C1273 and C1274 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1273 and C1274 are output only in Test Mode.
Scheme 21
HINT
Check the connection status between the sensor connector and the vehicle wire harness.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1415 C1416 | Any of the following is detected: An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more. | Rear speed sensor RH/LH Speed sensor circuit Sensor installation Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH) Skid control ECU (Brake actuator assembly) |
| C1273 C1274 | Detected only during Test Mode. | Rear speed sensor RH/LH Sensor installation Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH) |
| C1277 C1278 | Detected only during Test Mode. | Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH) |
HINT
- DTC C1415 is for the rear speed sensor RH.
- DTC C1416 is for the rear speed sensor LH.
Scheme 22
The skid control ECU (brake actuator assembly) acquires steering angle sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores the previous zero point.
If front wheel alignment or the steering wheel position is adjusted without disconnecting the negative battery terminal, or if yaw rate and acceleration sensor zero point is not acquired after the adjustments have been completed, the skid control ECU (brake actuator assembly) detects the difference between the previous zero point and newly acquired zero point and stores this DTC to indicate a poor adjustment.
Warning operation for the steering angle sensor zero point malfunction will be canceled by turning the engine switch off.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1290 | The newly acquired steering angle sensor zero point vastly differs from the previous one. | Yaw rate and acceleration sensor zero point calibration incomplete Poor adjustment of the center position of the steering wheel Poor adjustment of front wheel alignment |
The ABS motor relay supplies power to the pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the pump motor.
If the voltage supplied to the motor relay (+BM) is below the DTC detection threshold due to low voltage from the battery or alternator, these DTCs may be stored.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1361 | Immediately after the engine switch is turned on (IG), the relay contact is closed for 4 seconds when the motor fail-safe relay is off. | ABS motor fail-safe relay circuit ABS motor fail-safe relay (Brake actuator assembly) |
| C146C | Either of the following is detected: All of the following conditions continue for 0.1 seconds or more. The IG1 terminal voltage is between 9.5 and 17.2 V. Initial check is being performed, or ABS, BA, TR(A)C or VSC is operating. Relay contact remains open when the relay is turned on. Both of the following conditions continue for 0.1 seconds or more. The IG1 terminal voltage is less than 9.5 V. Relay contact remains open when the relay is turned on. | ABS NO. 1 fuse (Fusible link block assembly) ABS motor relay circuit ABS motor relay (Brake actuator assembly) |
| C146D | When the motor relay is turned off, the motor relay remains closed for 4 seconds or more. | ABS motor relay circuit ABS motor relay (Brake actuator assembly) |
Scheme 23
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.
This DTC is stored when the skid control ECU (brake actuator assembly) receives a sensor supply voltage malfunction signal from the yaw rate and acceleration sensor (airbag sensor assembly).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1381 | At a vehicle speed of more than 3 km/h (2 mph), an acceleration sensor power source malfunction signal is received for 10 seconds or more. | Acceleration sensor power source circuit Acceleration sensor (Airbag sensor assembly) |
Scheme 24
Refer to DTCs C1413 and C1414. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1401 C1402 | Any of the following is detected: At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more. At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more. At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more. | Front speed sensor RH/LH Sensor installation Front speed sensor rotor RH/LH (Front drive outboard joint shaft assembly RH/LH) |
HINT
- DTC C1401 is for the front speed sensor RH.
- DTC C1402 is for the front speed sensor LH.
Refer to DTCs C1415 and C1416. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1403 C1404 | Any of the following is detected: At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more. At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more. At a vehicle speed less than 10 km/h (6 mph), outputs from both rear speed sensors are 0 km/h (0 mph) for a cumulative time of 200 seconds. | Rear speed sensor RH/LH Sensor installation Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH) |
HINT
- DTC C1403 is for the rear speed sensor RH.
- DTC C1404 is for the rear speed sensor LH.
Refer to DTCs C1413 and C1414. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1405 C1406 | Either of the following is detected: An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more. | Front speed sensor RH/LH Speed sensor circuit Skid control ECU (Brake actuator assembly) |
HINT
- DTC C1405 is for the front speed sensor RH.
- DTC C1406 is for the front speed sensor LH.
Refer to DTCs C1415 and C1416. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1407 C1408 | Either of the following is detected: An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more. | Rear speed sensor RH/LH Speed sensor circuit Skid control ECU (Brake actuator assembly) |
HINT
- DTC C1407 is for the rear speed sensor RH.
- DTC C1408 is for the rear speed sensor LH.
If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.
This DTC is stored when the IG1 terminal voltage deviates from the DTC detection condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1417 | The IG1 terminal voltage is 17.4 V or more for 1 second or more. | ECU-IG1 NO. 1 fuse Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU (brake actuator assembly) |
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.
These DTCs are stored when the skid control ECU (brake actuator assembly) receives an internal malfunction signal from the yaw rate and acceleration sensor (airbag sensor assembly).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1419 | A data malfunction signal is received from the acceleration sensor. | Acceleration sensor (Airbag sensor assembly) |
| C1435 | A data malfunction signal is received from the yaw rate sensor. | Yaw rate sensor (Airbag sensor assembly) |
Refer to DTC C1422. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1421 | Either of the following is detected: With the IG1 terminal voltage between 9.5 and 17.4 V, the VCM terminal voltage is not between 4.4 and 5.6 V for 1.2 seconds or more. When the VCM terminal voltage is between 4.8 and 5.2 V, the PMC terminal voltage is not between 0.19 and 4.57 V for 1.2 seconds or more. | Master cylinder pressure sensor (Brake actuator assembly) |
| C1423 | The PMC terminal voltage is less than 0.27 V for 5 seconds or more. | Master cylinder pressure sensor (Brake actuator assembly) |
| C1424 | Any of the following is detected: Noise occurs in the PMC terminal 7 times or more within 5 seconds. When the vehicle speed drops from 40 km/h (25 mph) to 10 km/h (6 mph), the master cylinder pressure does not change by at least 0.048 MPa (0.5 kgf/cm 2 , 7 psi). At a vehicle speed of 7 km/h (4 mph) or more, the PMC terminal voltage is between 0.86 and 1.0 V and does not change by at least 0.048 MPa (0.5 kgf/cm 2 , 7 psi) for 60 seconds or more. At a vehicle speed of 7 km/h (4 mph) or more, the PMC terminal voltage is 1.0 V or more and does not change by at least 0.048 MPa (0.5 kgf/cm 2 , 7 psi) for 30 seconds or more. | Master cylinder pressure sensor (Brake actuator assembly) |
The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.
DTC C1281 will be deleted when the master cylinder pressure sensor sends a master cylinder pressure signal or when Test Mode ends. DTC C1281 is output only in Test Mode.
Scheme 25
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1422 | When the stop light switch is off, the PMC terminal voltage is more than 0.86 V for 5 seconds or more. | Stop light switch circuit Master cylinder pressure sensor circuit Master cylinder pressure sensor (Brake actuator assembly) |
| C1281 | Detected only during Test Mode. | Stop light switch assembly Brake pedal load sensing switch (Brake pedal support assembly) Brake booster assembly Master cylinder pressure sensor (Brake actuator assembly) |
The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied.
The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line.
If the skid control ECU (brake actuator assembly) detects an open in this circuit, it will store this DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1425 | When IG1 terminal voltage is between 9.5 and 17.4 V, an open in the stop light switch input line continues for 3 seconds or more. | Wire harness or connector Stop light switch assembly Skid control ECU (Brake actuator assembly) |
Scheme 26
The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied.
The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect a short in the stop light input line, or the ground line of the stop light circuit with the stop light switch on (brake pedal depressed).
If the skid control ECU (brake actuator assembly) detects a short in this circuit, it will store this DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1426 | When the brake pedal load sensing switch is on, the master cylinder pressure is 2 MPa (20.4 kgf/cm 2 , 290 psi) or more and the deceleration calculated from the vehicle speed is 0.2 G or more, the stop light switch is off for 2 seconds or more. | Wire harness or connector Stop light switch assembly Brake pedal load sensing switch (Brake pedal support assembly) Skid control ECU (Brake actuator assembly) |
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1427 | Actuator pump motor does not operate properly. | Pump motor circuit Ground circuit Pump motor (Brake actuator assembly) |
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1428 | With the ABS motor relay off and the ABS motor fail-safe relay on, an open in the pump motor circuit continues for 2 seconds or more. | Pump motor (Brake actuator assembly) |
The brake pedal load sensing switch (brake pedal support assembly) turns on when the brake pedal is depressed with a force exceeding a predetermined level.
The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1429 | An open or short in the brake pedal load sensing switch circuit continues for 0.3 seconds or more. | Brake pedal load sensing switch (Brake pedal support assembly) Brake pedal load sensing switch circuit Skid control ECU (Brake actuator assembly) |
Scheme 27
Refer to DTC C1429. Refer to DESCRIPTION .
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1430 | Either of the following is detected: With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure 6 MPa (61.2 kgf/cm 2 , 870 psi) or more, the deceleration is 0.4 G or more for 1 second or more. With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure 6 MPa (61.2 kgf/cm 2 , 870 psi) or more, the vehicle speed is 0 km/h (0 mph) for 5 seconds or more. | Brake pedal load sensing switch (Brake pedal support assembly) Brake pedal load sensing switch circuit |
| C1431 | Either of the following is detected: Immediately after the engine switch is turned on (IG), the brake pedal load sensing switch is on and the stop light switch is off for 10 seconds or more. The condition that the brake pedal load sensing switch remains on while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (19 mph) occurs 5 times in succession. | Brake pedal load sensing switch (Brake pedal support assembly) Brake pedal load sensing switch circuit |
This DTC is stored when the skid control ECU (brake actuator assembly) receives a power supply open signal from the steering angle sensor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1432 | Steering angle sensor power supply malfunction signal is received from steering angle sensor. | Steering angle sensor power supply Steering angle sensor |
This DTC is stored when the skid control ECU (brake actuator assembly) receives an internal malfunction signal from the steering angle sensor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1433 | Either of the following is detected: With the IG1 terminal voltage 9.5 to 17.4 V, the skid control ECU (brake actuator assembly) receives an error signal from the steering angle sensor for 0.012 seconds. An open in the sensor power supply circuit for 1 second or more. | Steering angle sensor |
The skid control ECU (brake actuator assembly) receives signals from the steering angle sensor via the CAN communication system.
HINT
If there is a malfunction in the bus lines between the steering angle sensor and the CAN communication system, DTC U0126 (Lost Communication with Steering Angle Sensor Module) is output. When U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0126 first.
DTCs may be stored if one of the following occurs
- Steering angle sensor zero point value malfunction.
- Steering angle sensor signal malfunction.
- Steering angle sensor installation abnormality.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1434 | Error in communication between the skid control ECU (brake actuator assembly) and the steering angle sensor, or abnormal steering angle sensor zero point. | Sensor installation Steering angle sensor power supply Steering angle sensor Skid control ECU (Brake actuator assembly) |
Scheme 28
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition.
This DTC is stored when the skid control ECU (brake actuator assembly) detects improper installation of the yaw rate and acceleration sensor (airbag sensor assembly) or an abnormality in the difference between the yaw rate sensor value and the control value estimated based on the acceleration sensor, steering angle sensor and speed sensor signals.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1436 | Either of the following is detected: With the vehicle stationary, the yaw rate sensor output value is not 0 degrees/s. Abnormal comparison value. | Sensor installation Yaw rate sensor (Airbag sensor assembly) |
The skid control ECU (brake actuator assembly) receives signals from the ECM via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1437 | When the IG1 terminal voltage is 10 V or more and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more. | CAN communication system Skid control ECU (Brake actuator assembly) ECM |
The skid control ECU (brake actuator assembly) acquires the steering angle sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores previous zero points.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1439 | After the steering angle sensor zero point calibration is cleared due to, for example, fluctuations in the power source, the steering angle sensor zero point calibration cannot be obtained for 60 seconds of continuous driving. | Steering angle sensor Yaw rate and acceleration sensor (Airbag sensor assembly) |
| C1445 | Steering angle sensor zero point calibration cannot be obtained when the vehicle is driven without a record of steering angle sensor zero point calibration at a speed of 35 km/h (22 mph) or more for 30 seconds or more without the brake pedal being depressed. | Steering angle sensor Yaw rate and acceleration sensor (Airbag sensor assembly) |
If the skid control ECU (brake actuator assembly) determines that the vehicle is being driven at a steep bank angle, the skid control ECU (brake actuator assembly) stores DTC C1440 while VSC operation is temporarily disabled.
This is not a malfunction if the system and sensor circuits are normal and if the normal VSC operation resumes.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1440 | Driving at a steep bank angle. | Yaw rate and acceleration sensor (Airbag sensor assembly) |
The skid control ECU (brake actuator assembly) judges brake failure conditions have occurred based on the signal from the brake pedal load sensing switch (brake pedal support assembly) and master cylinder pressure sensor.
Note. Do not intentionally stop the engine when driving. Even when no malfunction has occurred in the brake system, DTC C1441 will be stored when it is judged that a failure has occurred in the brake system due to a reduction in vacuum.
DTCs may be stored if one of the following occurs
- The brake pedal load sensing switch (brake pedal support assembly) is malfunctioning (deviation in characteristics).
- The brake pedal is depressed when moving the vehicle with the engine not running and the engine switch on (IG).
- Bleeding is performed with the engine running or the engine switch on (IG).
- The accelerator and brake pedals are depressed simultaneously.*
HINT
*: The skid control ECU (brake actuator assembly) may store this DTC upon judging that a stuck on malfunction has occurred when the accelerator pedal and brake pedal are depressed simultaneously. However, this does not indicate a malfunction.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1441 | When the brake pedal load sensing switch and master cylinder pressure sensor are functioning normally and the brake pedal load sensing switch is judged as on, the pressure signal from the master cylinder pressure sensor does not indicate an increase. | Brake pedal load sensing switch (Brake pedal support assembly) Brake booster assembly Skid control ECU (Brake actuator assembly) |
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1442 | With terminal IG1 voltage between 9.5 and 17.4 V, an invalid data signal is received from the acceleration sensor for 10 seconds or more. | Acceleration sensor (Airbag sensor assembly) |
| C1443 | With terminal IG1 voltage between 9.5 and 17.4 V, an invalid data signal is received from the yaw rate sensor for 10 seconds or more. | Yaw rate sensor (Airbag sensor assembly) |
The ABS solenoid relay supplies power to the ABS solenoid and TR(A)C solenoid.
The solenoid relay is turned on 1.5 seconds after the engine switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.
The ABS solenoid relay is housed in the skid control ECU in the brake actuator assembly.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C146E | Either of the following is detected: Both of the following conditions continue for 0.2 seconds or more. The IG1 terminal voltage is 9.5 V or more. The solenoid relay contact is open when the relay is on. Both of the following conditions continue for 0.2 seconds or more. The IG1 terminal voltage becomes lower than 9.5 V when the relay is turned on. The relay contact remains open. | ABS NO. 2 fuse (Fusible link block assembly) ABS solenoid relay circuit ABS solenoid relay (Brake actuator assembly) |
| C146F | Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed for 4 seconds when the relay is turned off. | ABS solenoid relay circuit ABS solenoid relay (Brake actuator assembly) |
Scheme 29
The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor and yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0073 | Any of the following is detected: When the IG1 terminal voltage is between 10 and 17.4 V, after the output of data from the skid control ECU (brake actuator assembly) is completed, the signals cannot be sent for 5 seconds or more. A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.) When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession: A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs more than once within 5 seconds. | CAN communication system |
| U0100 | The IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more. | CAN communication system Skid control ECU (Brake actuator assembly) ECM |
| U0124 | Either of the following is detected: When the IG1 terminal voltage is between 10 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession: Data from the acceleration sensor cannot be received once or more within 5 seconds. | CAN communication system Skid control ECU (Brake actuator assembly) Acceleration sensor (Airbag sensor assembly) |
| U0126 | Either of the following is detected: When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession: Data from the steering angle sensor cannot be received once or more within 5 seconds. | CAN communication system Skid control ECU (Brake actuator assembly) Steering angle sensor |
Scheme 30
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
If any of the following is detected, the ABS warning light remains on
- The skid control ECU (brake actuator assembly) connector is disconnected from the skid control ECU (brake actuator assembly).
- There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.
- There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).
- The ABS control system is defective.
HINT
In some cases, the Techstream cannot be used when the skid control ECU (brake actuator assembly) is abnormal.
Scheme 31
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
If any of the following is detected, the brake warning light remains on
- The skid control ECU (brake actuator assembly) connector is disconnected from the skid control ECU (brake actuator assembly).
- The brake fluid level is insufficient.
- The parking brake is applied.
- EBD operation is not possible.
- The brake booster assembly is judged to be defective.
Scheme 32
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
- The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
- Pressing the VSC OFF switch (integration control and panel assembly) turns off TR(A)C control and pressing and holding this switch turns off TR(A)C and VSC controls. If TR(A)C control is turned off, the TR(A)C OFF message is displayed on the multi-information display in the combination meter assembly.
- When the skid control ECU (brake actuator assembly) determines that the SFI system is malfunctioning, it disables TR(A)C control due to a fail-safe function when the MIL (check engine warning light) is illuminated. When TR(A)C control is disabled, TR(A)C OFF message is displayed on the multi-information display in the combination meter assembly.
Scheme 33
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
Pressing the VSC OFF switch (integration control and panel assembly) turns off TR(A)C operation and pressing and holding this switch turns off TR(A)C and VSC operation. If VSC operation is turned off, the VSC OFF indicator light will come on.
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
The slip indicator light blinks during VSC and/or TR(A)C operation.
If a malfunction is detected, the slip indicator light comes on to warn the driver. Refer to DIAGNOSIS SYSTEM [06/2012 - ] .
Scheme 34
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
A buzzer sounds to alert the driver when the vehicle-to-vehicle distance becomes less than the set value (for vehicles with a dynamic radar cruise control).
Scheme 35
Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs by blinking the ABS warning and slip indicator lights.
Scheme 36
Connecting terminals TS and CG of the DLC3 causes the ECU to display Test Mode DTCs by blinking the ABS warning and slip indicator lights.
HINT
TR(A)C OFF message is displayed on the multi-information display during Test Mode because TR(A)C is prohibited.
In Test Mode (signal check), a malfunction in a speed sensor that cannot be detected when the vehicle is stopped can be detected while driving.
Sensor check mode can be entered by connecting terminals TS and CG of the DLC3 and turning the engine switch from off to on (IG).
