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TROUBLESHOOTING ANTI-SKID BRAKING SYSTEM (ABS) 35B-15 NOTE: The ABS warning lamp does not turn OFF Q: Is the diagnosis code C100A, C1015, C1020 or C102B set? Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then go to Step 11. NO : Intermittent malfunction (Refer to GROUP − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 11. Check whether the diagnosis code is NOTE: The ABS warning lamp does not turn OFF Q: Is the diagnosis code C100A, C1015, C1020 or C102B set? Return to Step 1. NO : This diagnosis is complete. Code No. C1011 FL wheel speed sensor signal
Code No. C101C FR wheel speed sensor signal
Code No. C1027 RL wheel speed sensor signal
Code No. C1032 RR wheel speed sensor signal CAUTION If there is any problem in the CAN bus lines, an − CAN Bus Diagnostics Table ). 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 ABS-ECU. ABS-ECU uses DIAGNOSIS CODE SET CONDITIONS ABS-ECU monitors the signals from each wheel • 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 • ABS-ECU malfunction • Disturbance of magnetisation pattern for wheel speed detection encoder • The number of poles on the magnetic encoder for wheel speed detection (the number of N-pole and Past trouble • When the diagnosis code No. C100A, C1015, C1020 or C102B is also set, carry out diagnosis − How to Use Troubleshooting/How to Treat Past • When the diagnosis code No. C100A, C1015, C1020 or C102B is not set, the following condi- • Some wheels slip • Unstable vehicle attitude • External noise interference • Vehicle ran with the parking brake applied. |