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AC612691 AO Connector: A-58 <LHD> A-58 (B) TROUBLESHOOTING ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-37 CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. • When the hydraulic unit (integrated with ASC- ECU) is replaced, always carry out the calibra- and OPERATION • The wheel speed sensor is a kind of a pulse gen- erator. It consists of encoders (a plate on which • The pulse signals, which the wheel speed sensor creates, are sent to ASC-ECU. ASC-ECU uses DIAGNOSIS CODE SET CONDITIONS • Irregular change in the wheel speed sensor sig- nal • Wheel speed sensor signal continuously indi- cates high value. PROBABLE CAUSES Current trouble • 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 • 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 • ASC-ECU malfunction • Disturbance of magnetisation pattern for wheel speed detection encoder • The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is Past trouble • When diagnosis code No.C100A is also set, carry out diagnosis with particular emphasis on wiring − How to Use Troubleshooting/How to Treat Past Trouble ). • When diagnosis code No.C100A is not set, the following conditions may be present: • Some wheels slip • Unstable vehicle attitude • External noise interference • Vehicle ran with the parking brake applied DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting Q: Is the diagnosis code No.C1011 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Q: Is diagnosis code No.C100A also set? |