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⦆ Wheel speed sensor signal continuously indicates high value. PROBABLE CAUSES Current trouble ⦆ Excessive gap between the wheel speed sensor and the ⦆ Adhesion of foreign materials on the wheel speed sensor ⦆ Adhesion of foreign materials on the wheel speed detection ⦆ Wheel bearing malfunction ⦆ Malfunction of wheel speed sensor ⦆ Damaged wiring harness and connectors ⦆ External noise interference ⦆ Improper installation of the wheel speed sensor ⦆ Deformation of the wheel speed detection encoder ⦆ ABS-ECU malfunction ⦆ Disturbance of magnetization pattern for wheel speed Past trouble ⦆ When the diagnostic trouble code No. C102B is also set, carry ⦆ When the diagnostic trouble code No. C102B is not set, the ⦆ Right or/and left wheels are rotated. ⦆ Unstable vehicle attitude ⦆ External noise interference ⦆ Vehicle ran with the parking brake applied. DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: Vehicle Communication Interface (V.C.I.) ⦆ MB991827: M.U.T.-III USB Cable ⦆ MB991910: M.U.T.-III Main Harness A ⦆ MB991974: ABS check harness STEP 1. M.U.T.-III CAN bus diagnostics Q:Is the check result normal? YES: Go to Step 3. NO: Repair the CAN bus lines. (Refer to GROUP 54D - CAN Bus Diagnostics table P.54D-17.) On completion, go to ANTI-LOCK BRAKING SYSTEM (ABS) 35B-47 ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS |