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TROUBLESHOOTING ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-45 • 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.C1020 is also set, carry out diagnosis with particular emphasis on wiring − How to Use Troubleshooting/How to Treat Past Trouble ). • When diagnosis code No.C1020 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.C1027 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Q: Is the diagnosis code No. C1020 also set? YES : Perform the diagnosis for the diagnosis code No. C1020 (Refer to NO : Go to Step 4. STEP 4. Connector check: A-58 ASC-ECU Q: Is the check result normal? YES : Go to Step 5. NO : Repair the defective connector. Then go to STEP 5. Wiring harness check between A-58 Q: Is the check result normal? YES : Go to Step 6. NO : Repair the wiring harness. Then go to Step STEP 6. Check for wheel speed sensor <RL> Q: Is the check result normal? YES : Go to Step 7. NO : Reinstall the wheel speed sensor <RL> ). Then go to Step 7. STEP 7. Check for wheel speed sensor <RL> Q: Is the check result normal? YES : Go to Step 8. NO : Replace the wheel speed sensor <RL> ). Then go to Step 11. STEP 8. Check for wheel bearing looseness . • Loose wheel bearing may increase the gap • Check the Rear wheel hub assembly <RL> − Wheel Bearing Axial Play Check ). Q: Is the check result normal? YES : Go to Step 9. NO : Replace the rear wheel hub assembly <RL> − Rear axle hub assembly ). Then go to Step 12. |