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TROUBLESHOOTING ANTI-SKID BRAKING SYSTEM (ABS) 35B-23 STEP 5. Check whether the diagnosis code is NOTE: The ABS warning lamp does not turn OFF Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? Replace the wheel speed sensor (Refer to <front> or Then go to Step 6. NO : Intermittent malfunction (Refer to GROUP − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 6. Check whether the diagnosis code is NOTE: The ABS warning lamp does not turn OFF Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then go to Step 7. NO : This diagnosis is complete. STEP 7. Check whether the diagnosis code is NOTE: The ABS warning lamp does not turn OFF Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? Return to Step 1. NO : This diagnosis is complete. Code No. C1046 FL wheel speed sensor phase
Code No. C1047 FR wheel speed sensor phase
Code No. C1048 RL wheel speed sensor phase
Code No. C1049 RR wheel speed sensor phase 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 This diagnosis code is set if any malfunction below is • When the brake fluid pressure is decreased for a long time. • When the brake fluid pressure is held for a long time. PROBABLE CAUSES • Damaged wiring harness and connectors • External noise interference • Malfunction of wheel speed sensor • ABS-ECU malfunction • Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detec- • Adhesion of foreign materials on the wheel speed sensor • Adhesion of foreign materials on the magnetic encoder for wheel speed detection • Wheel bearing malfunction • Improper installation of the wheel speed sensor • Deformation of the magnetic encoder for wheel speed detection • Disturbance of magnetization pattern for mag- netic encoder for wheel speed detection • Missing teeth of the magnetic encoder for wheel speed detection |