DTC C1464/31: Front Speed Sensor RH Circuit; DTC C1271/71: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1465/32: Front Speed Sensor LH Circuit [09/2015 - ]: Description
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the brake control system. 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 signals from the speed sensor are used to determine the relationship of the pulses that are generated by the 2 MREs. Upon receiving the speed sensor signal, the sensor IC outputs a forward or backward signal to the ECU.
DTCs C1271/71 and C1272/72 are cleared when the speed sensor sends a vehicle speed signal or test mode ends. DTCs C1271/71 and C1272/72 are output only in test mode.
| DTC Code | Information Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1464/31 | 251 | At a vehicle speed of 10 km/h (6 mph) or more, an open or short in the sensor signal circuit of the abnormal wheel continues for 1 second or more. |
|
| ↑ | 252 | Signals from more than 1 wheel are abnormal. | ↑ |
| ↑ | 253 | Speed sensor signal circuit is open for 0.5 seconds or more. | ↑ |
| ↑ | 254 | Momentary interruption of sensor signal from the abnormal wheel occurs 255 times or more. | ↑ |
| ↑ | 255 | Frequency of 2.5 kHz or higher is input. |
|
| ↑ | 256 | With the engine switch on (IG) and the vehicle speed at 10 km/h (6 mph) or more, the rotating direction of each wheel changes 7 times within 6 milliseconds. |
|
| ↑ | 257 | Rotating direction of one of the wheels is not the same as that of the other wheels for 1 second while driving at 30 km/h (18 mph) or more. | ↑ |
| ↑ | 258 | Rotating direction of one of the wheels is not detected normally, and the rotating direction of each of the other wheels is not the same for 1 second while driving at 30 km/h (18 mph) or more. | ↑ |
| ↑ | 259 | 3 of the speed sensors detect normal reverse signals, and the other speed sensor detects abnormal signals 75 times with the engine switch on (IG) while driving in reverse at 3 km/h (1.8 mph). | ↑ |
| ↑ | 261 | Reverse signal is output for 1 second or more while driving at 100 km/h (60 mph) or more. | ↑ |
| ↑ | 262 | When either condition below is met:
|
|
| C1465/32 | 264 | At a vehicle speed of 10 km/h (6 mph) or more, an open or short in the sensor signal circuit of the abnormal wheel continues for 1 second or more. |
|
| ↑ | 265 | Signals from more than 1 wheel are abnormal. | ↑ |
| ↑ | 266 | Speed sensor signal circuit is open for 0.5 seconds or more. | ↑ |
| ↑ | 267 | Momentary interruption of sensor signal from the abnormal wheel occurs 255 times or more. | ↑ |
| ↑ | 268 | Frequency of 2.5 kHz or higher is input. |
|
| ↑ | 269 | With the engine switch on (IG) and the vehicle speed at 10 km/h (6 mph) or more, the rotating direction of each wheel changes 7 times within 6 milliseconds. |
|
| ↑ | 270 | Rotating direction of one of the wheels is not the same as that of the other wheels for 1 second while driving at 30 km/h (18 mph) or more. | ↑ |
| ↑ | 271 | Rotating direction of one of the wheels is not detected normally, and the rotating direction of each of the other wheels is not the same for 1 second while driving at 30 km/h (18 mph) or more. | ↑ |
| ↑ | 272 | 3 of the speed sensors detect normal reverse signals, and the other speed sensor detects abnormal signals 75 times with the engine switch on (IG) while drive in reverse at 3 km/h (1.8 mph). | ↑ |
| ↑ | 274 | Reverse signal is output for 1 second or more while driving at 100 km/h (60 mph) or more. | ↑ |
| ↑ | 275 | When either condition below is met:
|
|
| C1271/71 C1272/72 |
- | Detected only during test mode. |
|
HINT:
- DTC C1464/31 is for the front speed sensor RH.
- DTC C1465/32 is for the front speed sensor LH.