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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 ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed.
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ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ABS-ECU will set the relevant diagnosis code.
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- Wheel bearing malfunction
- Deformation of the magnetic encoder for wheel speed detection
- Missing teeth of the magnetic encoder for wheel speed detection
- Adhesion of foreign materials on the magnetic encoder for wheel speed detection
- ABS-ECU malfunction
- Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
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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 - CAN Bus Diagnosis table ). On completion, go to Step 2.
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Q.
Is the diagnosis code No. C1043 set?
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This diagnosis is complete.
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Q.
Is the check result normal?
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NO (2WD) : Replace the rear wheel hub assembly (Refer to GROUP 27A - Rear axle hub assembly ).
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NO (4WD) : Replace the wheel bearing (Refer to GROUP 27B - Rear axle hub assembly ).
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Check the encoder for adhesion of foreign materials or deformation.
Q.
Is the check result normal?
Go to Step 5.
NO (Presence of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetisation pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. When the encoder is deformed, replace the rear hub assembly.
NO <Deformation (2WD)> : Replace the rear wheel hub assembly (Refer to GROUP 27A - Rear axle hub assembly ).
NO <Deformation (4WD)> : Replace the wheel bearing (Refer to GROUP 27B - Rear axle hub assembly ).
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 20 km/h or more.
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The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.
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Q.
Is the diagnosis code No. C1043 set?
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Replace the ABS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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