Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL
CHECK SENSOR AND SENSOR ROTOR SERRATIONS
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - EACH SPEED SENSOR)
DTC C1235/35 Foreign Object is Attached on Tip of Front Speed Sensor RH
DTC C1236/36 Foreign Object is Attached on Tip of Front Speed Sensor LH
DTC C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH
DTC C1239/39 Foreign Object is Attached on Tip of Rear Speed Sensor LH
DTC C1275/75 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
DTC C1276/76 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)
DTC C1277/77 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
DTC C1278/78 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS 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 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 ECU.
DTCs C1275/75 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1275/75 to C1278/78 are output only in the Test Mode.
| DTC No. | DTC Detection Condition | Trouble Area |
| C1235/35 C1236/36 C1238/38 C1239/39 | When either of the following is detected: At a vehicle speed of 12 mph (20 km/h) or more, noise occurs in the sensor signal from the abnormal wheel for 5 seconds or more. At a vehicle speed of 6 mph (10 km/h) or more, noise is input once per rotor rotation for 15 seconds or more. | Speed sensor Speed sensor rotor Sensor installation Skid control ECU |
- HINT:
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the skid control ECU, perform zero point calibration and store system information .
- HINT:
- When C0200/31, C0205/32, C0210/33 or C0215/34 is output together with C1235/35, C1236/36, C1238/38 or C1239/39, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, or C0215/34 first.
| 1.CHECK SENSOR AND SENSOR ROTOR SERRATIONS |
Connect the oscilloscope to terminals FR-, FL-, RR-, and RL- of the skid control ECU and body ground.
Check the signal waveform.
- OK:
- The same waveform is output from all the 4 wheels and there is no noise or interference in the waveform.
Check that the waveform does not change while jiggling a connector or wire harness.
- OK:
- The waveform does not change.
- HINT:
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| OK | |
| 2.RECONFIRM DTC |
Clear the DTC .
Start the engine.
Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.
Check if the same DTC is recorded .
- Result:
Condition Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output B
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| A | |
| 4.CHECK REAR SPEED SENSOR TIP |
Remove the rear speed sensor .
Check the speed sensor tip.
- OK:
- No scratches or foreign matter on the sensor tip.
- NOTICE:
- Check the speed sensor signal after cleaning/replacement .
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| OK | |
| 5.CHECK EACH SPEED SENSOR ROTOR |
Remove each speed sensor rotor.
Check the speed sensor rotor.
- OK:
- No scratches, oil, or foreign matter on the rotors.
- NOTICE:
- Check the speed sensor signal after cleaning/replacement .
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| OK | |
| 6.RECONFIRM DTC |
Install the rear speed sensor and the speed sensor rotor.
Reconnect the skid control ECU connector and the speed sensor connector.
Clear the DTC .
Start the engine.
Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.
Check if the same DTC is recorded .
- Result:
Result Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output B
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| A | |
| 7.REPLACE EACH SPEED SENSOR |
Turn the engine switch off.
Replace each speed sensor ( for front, or for rear).
- NOTICE:
- Check the speed sensor signal after replacement .
| NEXT | |
| 8.RECONFIRM DTC |
Clear the DTC .
Start the engine.
Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.
Check if the same DTC is recorded .
- Result:
Result Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output B
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| A | ||
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