SERVICE MANUAL
  Applies to: Hyundai Coupe/Tiburon 1998-2000
GROUP
Brake Systems Anti-lock Brake System
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CIRCUIT INSPECTION (SPEED SENSOR CIRCUIT - SPEED JUMP SYMPTOM) 

At each wheel hub there is a tone wheel and an inductive sensor, which supplies the wheel speed information to the ABSCM. The sensor is comprised of a magnet and a pole piece surrounded by a coil. When the tone wheel rotates adjacent to the sensor pole piece, an alternating current signal is generated in the coil with a frequency proportional to wheel speed.

A special integrated circuit in the ABSCM translates the generated AC signal to a square wave.

This square wave is used by the microprocessor to operate the ABS.

DTC
Code
DISPLAY ON
SCAN TOOL
Symptom
Possible cause
71
LF TONE WHEEL TOOTH MISSING
Speed jump on the exciter wheel FL
  • Tone wheel
  • Wheel speed sensor
  • Harness or connector between the wheel speed sensor and the ABSCM
  • ABSCM
72
RF TONE WHEEL TOOTH MISSING
Speed jump on the exciter wheel FR

73
LR TONE WHEEL TOOTH MISSING
Speed jump on the exciter wheel RL

74
RR TONE WHEEL TOOTH MISSING
Speed jump on the exciter wheel RR

19
DEFECTIVE TONE WHEEL
Check the tone wheels
  • Tone wheel
  • Wheel speed sensor and harness
WIRING DIAGRAM
INSPECTION PROCEDURE
  1. Check Wheel Speed Sensor

  1. Check the harness and the connector between the ABSCM and each wheel speed sensor

  1. Check tone wheel and sensor installation