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DIAGNOSIS TSB Revision ACTIVE STABILITY CONTROL SYSTEM (ASC) 35C-71 OPERATION • Each wheel speed detecting section is a kind of a pulse generator. It consists of the encoder (plate on which the • The pulse signals generated by the wheel speed detecting section are sent to ASC-ECU. ASC-ECU uses the fre- . DTC SET CONDITIONS ASC-ECU monitors the signals from each wheel speed sensor • Missing wheel speed sensor signal • Wheel speed sensor signal continuously indicates low 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 • Wheel bearing malfunction • Deformation of the wheel speed detection encoder • 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 changed Past trouble • When DTC C1020 is also set, carry out diagnosis with par- ticular emphasis on wiring harness and connector failures − How to Use Troubleshooting/How to Treat ). • When DTC 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. • Rotate only two wheels with drum tester |