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- The wheel speed sensor is a kind of a pulse generator. It consists of encoders
(a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the
wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to the wheel speed.
- The pulse signals, which the wheel speed sensor creates, are sent to ASC-ECU. ASC-ECU
uses the frequency of the pulse signals to determine the wheel speed.
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This diagnosis code is set if any malfunction below is found:
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- When the brake fluid pressure is decreased for a long time.
- When the brake fluid pressure is held for a long time.
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- Damaged wiring harness and connectors
- External noise interference
- Malfunction of wheel speed sensor
- ASC-ECU malfunction
- Excessive gap between the wheel speed sensor and the wheel speed detection encoder
- Adhesion of foreign materials on the wheel speed sensor
- Adhesion of foreign materials on the wheel speed detection encoder
- Wheel bearing malfunction
- Improper installation of the wheel speed sensor
- Deformation of the wheel speed detection encoder
- Disturbance of magnetisation pattern for wheel speed detection encoder
- Missing teeth of the wheel speed detection encoder
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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Q.
Is the diagnosis code No. C1047 set?
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This diagnosis is complete.
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Check that the diagnosis codes No. C1015, C101C, C101F, and C1042 are also set.
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Q.
Are the diagnosis codes No. C1015, C101C, C101F, and C1042 also set?
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Carry out the diagnosis for the relevant diagnosis codes, and then go to Step
5.
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- Drive the vehicle at 20 km/h or more.
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Q.
Is the diagnosis code No. C1047 set?
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Replace the ASC-ECU, and then go to Step 5.
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This diagnosis is complete.
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- Drive the vehicle at 20 km/h or more.
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Q.
Is the diagnosis code No. C1047 set?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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This diagnosis is complete.
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