DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the Multi-terrain ABS, EBD, BA, VSC, A-TRAC, CRAWL and hill-start assist control systems. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.
To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the skid control ECU.
Scheme 148
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C0200/31 C0205/32 | When any of the following conditions is detected: 1. At a vehicle speed of 10 km/h (6 mph) or more, the pulses are not input for 1 second. 2. A momentary interruption of the speed sensor signal occurs at least 255 times when switching the engine switch on (IG) and off. 3. Continuous noise occurs in the speed sensor signals at a vehicle speed of 20 km/h (12 mph) or more. 4. The speed sensor signal circuit is open for 0.12 seconds or more. | Front speed sensor RH Front speed sensor LH Harness or connector Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU) |
| C1235/35 C1236/36 | Noise in the speed sensor signals occurs 75 times or more for 5 seconds when the vehicle speed is 20 km/h (12 mph) or more. | Front speed sensor RH Front speed sensor LH Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU) |
HINT
- DTC C0200/31 and C1235/35 are for the front speed sensor RH.
- DTC C0205/32 and C1236/36 are for the front speed sensor LH.
Scheme 149
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the Multi-terrain ABS, EBD, BA, VSC, A-TRAC, CRAWL and hill-start assist control systems. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.
To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the skid control ECU.
Scheme 150
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C0210/33 C0215/34 | When any of the following conditions is detected: 1. At a vehicle speed of 10 km/h (6 mph) or more, the pulses are not input for 1 second. 2. A momentary interruption of the speed sensor signal occurs at least 255 times when switching the engine switch on (IG) and off. 3. Continuous noise occurs in the speed sensor signals at a vehicle speed of 20 km/h (12 mph) or more. 4. The speed sensor signal circuit is open for 0.12 seconds or more. | Rear speed sensor RH Rear speed sensor LH Harness or connector Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU) |
| C1238/38 C1239/39 | Noise in the speed sensor signals occurs 75 times or more for 5 seconds when the vehicle speed is 20 km/h (12 mph) or more. | Rear speed sensor RH Rear speed sensor LH Speed sensor rotor Sensor installation Master cylinder solenoid (Skid control ECU) |
HINT
- DTC C0210/33 and C1238/38 are for the rear speed sensor RH.
- DTC C0215/34 and C1239/39 are for the rear speed sensor LH.
Scheme 151
The solenoid turns on when signals are received from the ECU and controls the pressure acting on the wheel cylinders, thus controlling braking force.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C0226/21 | An open or short circuit in the SFRH or SFRR circuit continues for 0.05 seconds or more. | SFRH or SFRR circuit Master cylinder solenoid |
| C0236/22 | An open or short circuit in the SFLH or SFLR circuit continues for 0.05 seconds or more. | SFLH or SFLR circuit Master cylinder solenoid |
| C0246/23 | An open or short circuit in the SRRH or SRRR circuit continues for 0.05 seconds or more. | SRRH or SRRR circuit Master cylinder solenoid |
| C0256/24 | An open or short circuit in the SRLH or SRLR circuit continues for 0.05 seconds or more. | SRLH or SRLR circuit Master cylinder solenoid |
| C1225/25 | An open or short circuit in the SMCF circuit continues for 0.05 seconds or more. | SMCF circuit Master cylinder solenoid |
| C1226/26 | An open or short circuit in the SREA circuit continues for 0.05 seconds or more. | SREA circuit Master cylinder solenoid |
| C1227/27 | An open or short circuit in the SREC circuit continues for 0.05 seconds or more. | SREC circuit Master cylinder solenoid |
| C1228/28 | An open or short circuit in the STR circuit continues for 0.05 seconds or more. | STR circuit Master cylinder solenoid |
Scheme 152
The solenoid relay is built into the master cylinder solenoid.
This relay supplies power to each solenoid. If the initial check is OK, after the engine switch is turned on (IG), the relay turns on.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C0278/11 | When either of the following conditions is detected: Both of the following conditions continue for at least 0.2 seconds. IG voltage is between 9.5 V and 17 V. The relay contact is open when the relay is on. Both of the following conditions continue for at least 0.2 seconds. IG voltage is 9.5 V or less when the relay is on. The relay contact remains open. | ABS2 fuse Solenoid relay Harness or connector Master cylinder solenoid (Skid control ECU) |
| C0279/12 | The following condition continues for at least 0.2 seconds. The relay contact is closed immediately after turning the engine switch on (IG) when the relay is off. | ABS2 fuse Solenoid relay Harness or connector Master cylinder solenoid (Skid control ECU) |
If trouble occurs in the engine control system, the ECM transmits the abnormality to the skid control ECU. The skid control ECU stores this DTC and prohibits the following controls
- VSC
- A-TRAC
- CRAWL
- Hill-start Assist Control
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1201/51 | A malfunction signal is received from the ECM. | Engine control system |
The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1202/58 | When either of the following conditions is detected: The fluid level of the reservoir is LOW for 4 seconds, or 40 seconds after the engine switch is turned on (IG), or for 7 seconds during pump motor operation. With the ECU terminal IG1 voltage at 9.5 V to 17.0 V, an open in the brake fluid level warning switch circuit continues for 2 seconds or more. | Brake fluid level Brake fluid level warning switch Harness or connector Master cylinder solenoid (Skid control ECU) |
Scheme 153
The circuit is used to send control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU via the CAN communication system.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1203/53 | The engine/drivetrain specification and/or destination information from the ECM does not match the skid control ECU data. | ECM |
Scheme 154
The skid control ECU receives signals from the yaw rate and G sensor via the CAN communication system.
The yaw rate sensor has a built-in G sensor.
If there is trouble in the bus lines between the yaw rate and G sensor and the CAN communication system, the DTCs U0123/62 (yaw rate sensor communication trouble) and U0124/95 (G sensor communication trouble) are stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1210/36 | The yaw rate sensor zero point stored in the ECU is cleared. Zero point calibration has not been completed. | Yaw rate and G sensor Zero point calibration undone Harness or connector Master cylinder solenoid (Skid control ECU) |
| C1336/98 | The G sensor zero point stored in the ECU is cleared. Zero point calibration has not been completed. | Yaw rate and G sensor Zero point calibration undone Harness or connector Master cylinder solenoid (Skid control ECU) |
Scheme 155
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1223/43 | The ABS control system is abnormal. | ABS control system |
HINT
- This DTC is stored when the VSC system detects a malfunction in the ABS system.
- When DTC C1223/43 is stored, there is no malfunction in the skid control ECU.
The steering angle sensor signal is sent to the skid control ECU through the CAN communication system. When there is a malfunction in the communication system, it will be detected by the diagnosis function.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1231/31 | When the ECU IG terminal voltage is 9.5 V or higher, the steering angle sensor malfunction signal is received. | Steering angle sensor Harness or connector Steering angle sensor power supply CAN communication system Master cylinder solenoid (Skid control ECU) |
Scheme 156
The skid control ECU receives signals from the yaw rate and G sensor via the CAN communication system.
The yaw rate sensor has a built-in G sensor.
If there is trouble in the bus lines between the yaw rate and G sensor and the CAN communication system, the DTCs U0123/62 (yaw rate sensor communication trouble) and U0124/95 (G sensor communication trouble) are stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1232/32 | At a vehicle speed of 10 km/h (6 mph) or more, the fluctuation range of the signal from one of either GL1 or GL2 is below 80 mV and the fluctuation range of the signal of the other is higher than 1.9 V for 30 seconds or more. | Yaw rate and G sensor Harness or connector CAN communication system |
| C1234/34 | A sensor malfunction signal is received from the yaw rate sensor. | Yaw rate and G sensor Harness or connector CAN communication system |
| C1243/43 | The following condition repeats 16 times. GL1 and GL2 do not change when the vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph). | Yaw rate and G sensor Harness or connector CAN communication system |
| C1244/44 | When either of the following conditions is detected: 1. Both of the following conditions continue for at least 60 seconds. The vehicle is stopped. The difference between GL1 and GL2 does not drop less than 0.4 G after it reaches 0.6 G or more. 2. A data malfunction signal is received from the G sensor. | Yaw rate and G sensor Harness or connector CAN communication system |
| C1245/45 | The following condition continues for at least 60 seconds. The difference between the values calculated from the G sensor value and vehicle speed exceeds 0.35 G. | Yaw rate and G sensor Harness or connector CAN communication system |
| C1381/97 | A G sensor power source malfunction signal is received for at least 10 seconds at a speed of more than 3 km/h (2 mph). | Yaw rate and G sensor Harness or connector CAN communication system |
Scheme 157
If the voltage supplied to the IG1 terminal is within the DTC detection range due to malfunctions in components such as the battery and alternator circuit, this DTC is stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1241/41 | When either of the following conditions is detected: 1. Both of the following conditions continue for at least 10 seconds. The vehicle speed is more than 3 km/h (2 mph). The IG1 terminal voltage is below 9.5 V. 2. All of the following conditions continue for at least 0.2 seconds. The solenoid relay remains on. The IG1 terminal voltage is below 9.5 V. The relay contact is open. | Battery ECU-IG No. 2 fuse Charging system Harness or connector Master cylinder solenoid (Skid control ECU) |
Scheme 158
If there is a problem with the master cylinder solenoid (skid control ECU) power supply circuit, the skid control ECU stores DTCs and prohibits operation under the fail-safe function.
If the voltage supplied to the IG2 terminal is within the DTC detection range due to malfunctions in components such as the battery and alternator circuit, this DTC is stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1242/42 | The vehicle speed is 3 km/h (1.9 mph) or more and the voltage of the ECU IG2 terminal remains below 6.5 V for more than 7 seconds. | Battery IGN fuse Charging system Harness or connector Master cylinder solenoid (Skid control ECU) |
Scheme 159
The master cylinder pressure sensor and pressure control sensor are connected to the skid control ECU in the master cylinder solenoid.
Scheme 160
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1246/46 | When any of the following conditions is detected: 1. All of the following conditions continue for at least 30 seconds. The vehicle speed is more than 7 km/h (4 mph). The PM/C1 or PCTRL terminal voltage exceeds 0.86 V. The master cylinder pressure does not change by more than 0.048 MPa (0.5 kgf/cm 2 , 7.0 psi). 2. The PM/C1 or PCTRL terminal receives interference at least 7 times within 5 seconds. 3. Both of the following conditions continue for at least 1.2 seconds. The stop light switch is off. The PM/C1 or PCTRL terminal voltage is higher than 0.86 V or below 0.3 V. 4. Both of the following conditions continue for at least 1.2 seconds. The VM/C1 or VCTRL terminal voltage is between 4.4 and 5.6 V. The PM/C1 or PCTRL terminal voltage is not between 0.19 and 4.57 V. | Master cylinder pressure sensor Pressure control sensor Stop light switch Harness or connector Master cylinder solenoid |
The stop light switch signal is input to the skid control ECU and the skid control ECU detects the status of brake operation.
The skid control ECU has an open detection circuit.
If an open in the stop light switch input line or GND side stop light circuit is detected when the stop light switch is off, this DTC is stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1249/49 | The ECU terminal IG1 voltage is 9.5 to 17.0 V, ABS is not operating, and an open in the stop light switch circuit continues for 3 seconds or more. | Stop light switch Harness or connector Master cylinder solenoid (Skid control ECU) |
Scheme 161
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1251/51 | There is an open in the motor system circuit (motor input circuit). | Pump motor wire harness connection Brake booster with accumulator pump assembly Master cylinder solenoid (Skid control ECU) |
Scheme 162
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1252/52 | The motor operates for 3 minutes or more. | Hydraulic brake booster pump motor Hydraulic brake booster pump motor circuit Accumulator pressure sensor |
HINT
The pump motor continues operation for the first 3 minutes, then repeats start and stop.
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1253/53 | There is a motor system circuit (motor input circuit) malfunction. | Hydraulic brake booster pump motor Hydraulic brake booster pump motor circuit |
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
Scheme 163
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1254/54 | There is an accumulator pressure sensor malfunction (the fluid pressure does not change when the pump operates or when the brake is applied). | Hydraulic brake booster Accumulator pressure sensor Master cylinder pressure sensor |
The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1256/56 | The fluid pressure inside the accumulator is below the standard value. | Hydraulic brake booster Hydraulic brake booster pump motor Hydraulic brake booster pump motor circuit Accumulator pressure sensor |
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1257/57 | There is an open in the motor system circuit (motor input circuit). | Hydraulic brake booster pump motor circuit |
After confirming that the transfer is in the L4 position, CRAWL will be activated according to the vehicle conditions.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1268/68 | The skid control ECU receives an L4 abnormal status signal from the four wheel drive control ECU. | Center differential lock detection switch Center differential lock detection switch circuit Four wheel drive control ECU ECM |
Scheme 164
The skid control ECU 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 steering wheel position is adjusted without disconnecting the negative battery terminal, or if yaw rate and G sensor zero point is not acquired after the adjustments have been completed, the skid control ECU detects the difference between the previous zero point and newly acquired zero point and outputs this DTC to indicate a poor adjustment.
Warning of the steering angle sensor zero point malfunction will be canceled by turning the engine switch off.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1290/66 | The steering angle sensor zero point calibration position vastly differs from the recorded value. | Yaw rate and G sensor zero point calibration incomplete Poor adjustment of the centered position of the steering wheel Poor adjustment of front wheel alignment |
The skid control ECU measures the speed of each wheel by receiving signals from the speed sensor. These signals are used for recognizing that all 4 wheels are operating properly. Therefore, all wheel signals must be equal.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1337/37 | When either of the following conditions is detected: The diameter is different between the 2 front wheels and the 2 rear wheels. There is a wheel speed sensor fault. | Speed sensor Speed sensor rotor Speed sensor circuit Tire size |
When the center differential is locked, VSC control turns off and "VSC OFF" appears on the multi-information display.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1340/47 | When the terminal IG1 voltage is between 10 and 14 V and there is an open in the center differential lock circuit for 2 seconds or more. | Center differential lock switch Center differential lock switch circuit Four wheel drive control ECU |
Scheme 165
Upon receiving the CRAWL or hill-start assist control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1380/64 | When the voltage at the IG1 terminal is between 10 V and 14 V, the stop light driving output (STPO) is on, and a signal has not been input to the STP terminal for 5 seconds or more. When the voltage at the IG1 terminal is between 10 V and 14 V, the stop light driving output (STPO) is off, and the input signal at the STP terminal is different from the input signal at the STP2 terminal for 5 seconds or more. | BRK LP relay BRK LP relay circuit Master cylinder solenoid (Skid control ECU) |
If any of the following is detected, the ABS warning light remains on.
- The skid control ECU connectors are disconnected from the skid control ECU.
- There is a malfunction in the skid control ECU internal circuit.
- There is an open in the harness between the combination meter and skid control ECU.
HINT
There is a case that the Techstream cannot be used when the skid control ECU is abnormal.
Scheme 166
If any of the following is detected, the ABS warning light remains on.
- The skid control ECU connectors are disconnected from the skid control ECU.
- There is a malfunction in the skid control ECU internal circuit.
- There is an open in the harness between the combination meter and skid control ECU.
HINT
There is a case that the Techstream cannot be used when the skid control ECU is abnormal.
When CRAWL control starts after operating the CRAWL switch, the CRAWL indicator light turns on. When CRAWL control of the engine stops, the CRAWL indicator light begins blinking. When CRAWL control totally stops, the CRAWL indicator light turns off.
Scheme 167
When CRAWL control starts after operating the CRAWL switch, the CRAWL indicator light turns on. When CRAWL control of the engine stops, the CRAWL indicator light begins blinking. When CRAWL control totally stops, the CRAWL indicator light turns off.
The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.
Scheme 168
The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.
When the center differential is locked or the VSC OFF switch is operated, VSC control turns off and the VSC OFF indicator illuminates.
Scheme 169
When the center differential is locked or the VSC OFF switch is operated, VSC control turns off and the VSC OFF indicator illuminates.
The slip indicator light blinks during VSC, A-TRAC, CRAWL or hill-start assist control operation.
When the system fails, the slip indicator light comes on to warn the driver. Refer to «DIAGNOSIS SYSTEM».
Scheme 170
The slip indicator light blinks during VSC, A-TRAC, CRAWL or hill-start assist control operation.
When the system fails, the slip indicator light comes on to warn the driver. Refer to «DIAGNOSIS SYSTEM».
The skid control buzzer sounds while the accumulator pressure is abnormally low or an abnormality causing low fluid pressure occurs, and the skid control buzzer sounds intermittently while the VSC and hill-start assist control is activated.
Scheme 171
DTC output mode is set by connecting terminals TC and CG of the DLC3.
The DTCs are output to the multi-information display, and output by the blinking of the ABS warning light.
Scheme 172
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.
The signal check circuit detects trouble in the sensor or switch signal which cannot be detected by the DTC check.
Connecting terminals TS and CG of the DLC3 starts the check.
Scheme 173
See also:
• ON-VEHICLE INSPECTION
• ADJUSTMENT