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TROUBLESHOOTING ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-53 DIAGNOSIS CODE SET CONDITIONS • Missing wheel speed sensor signal • Wheel speed sensor signal continuously indi- cates low value. PROBABLE CAUSES Current trouble • Excessive gap between the wheel speed sensor and the wheel speed detection encoder • Wheel bearing malfunction • Deformation of the wheel speed detection encoder • Adhesion of foreign materials on the wheel speed sensor • Adhesion of foreign materials on the wheel speed detection encoder • Malfunction of wheel speed sensor • Improper installation of the wheel speed sensor • ASC-ECU malfunction • The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is Past trouble • When diagnosis code No.C1015 is also set, carry out diagnosis with particular emphasis on wiring − How to Use Troubleshooting/How to Treat Past Trouble ). • When diagnosis code No.C1015 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. • Rotate only two wheels with drum tester DIAGNOSIS 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.C101F set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Q: Is diagnosis code No.C1015 also set? YES : Perform the diagnosis for diagnosis code No.C1015 (Refer to NO : Go to Step 4. STEP 4. Check for wheel speed sensor <FR> Q: Is the check result normal? YES : Go to Step 5. NO : Reinstall the wheel speed sensor <FR> ). Then go to Step 5. STEP 5. Check for wheel speed sensor Q: Is the check result normal? YES : Go to Step 6. NO : Replace the wheel speed sensor <FR> ). Then go to Step 9. STEP 6. Check for wheel bearing looseness − Wheel Bearing Axial Play Check ). Q: Is the check result normal? YES : Go to Step 7. NO : Replace the wheel bearing <FR> (Refer to − Front Axle Hub Assembly ). Then go to Step 10. |