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Speed Sensor & Deceleration Sensor Diagnostics

NOTE: While diagnosing speed sensor, ABS functions like a conventional system. Ensure vehicle is not in 4WD mode.
  1. Ensure battery voltage is about 12 volts. Turn ignition on. Ensure REAR ANTI-LOCK light illuminates then goes out after 3 seconds. If REAR ANTI-LOCK light does not illuminate, check fuse, bulb and wiring harness.
  2. Turn ignition off. Using a jumper wire, connect check connector terminals Ts and E1. See Figure. Start engine. After one flash in 1-1.5 seconds, REAR ANTI-LOCK light should flash 4 times per second.
  3. Drive vehicle at about 12.4 MPH or greater. Strongly depress brake pedal and then release. REAR ANTI-LOCK light should illuminate while brake pedal is applied and flash 4 times per second when pedal is released.
  4. Drive vehicle straight ahead at speed greater than 31 MPH, then stop vehicle. Ensure REAR ANTI-LOCK light flashes 4 times per second. If light functions as described, check is completed. If light does not function as indicated, connect jumper wire between terminals Tc and E1 of check connector (DO NOT remove jumper wire between terminals Ts and E1). See Figure.
  5. If a malfunction is detected, 4 seconds will elapse, then REAR ANTI-LOCK light will begin flashing 2-digit code. First series of flashes indicates first digit of code. After a 1.5-second pause, second series of flashes will begin, indicating second digit of code.
  6. If 2 or more codes are stored, a 2.5-second pause will separate codes. After all codes are flashed, there will be a 2.5-second pause, then all codes will be repeated.
  7. Record diagnostic codes. Turn ignition off. Repair as necessary. See SPEED SENSOR & DECELERATION SENSOR DIAGNOSTIC CODES . Remove jumper wire from check connector. Clear diagnostic codes. See CLEARING CODES  under DIAGNOSIS & TESTING.
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