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Speed Sensor Diagnostics

NOTE: While diagnosing speed sensors, brake system functions as a conventional system.
  1. Ensure battery voltage is about 12 volts. Turn ignition on. Ensure ABS light illuminates, then goes out after about 3 seconds. If ABS light does not illuminate, check fuse, bulb and wiring harness.
  2. Turn ignition off. DO NOT  remove short pin from check connector. Using a jumper wire, jumper terminals Ts and E1 of check connector. See Figure. Engage parking brake. Start engine. Ensure ABS light blinks 4 times per second.
  3. Drive vehicle straight ahead above 50 MPH. Ensure ABS light blinks while vehicle speed is less than 28 MPH. ABS light will stop blinking above 28 MPH, and then blink once at 50 MPH. If ABS light blinked as described, check is completed. If ABS light does not blink as indicated, stop vehicle.
  4. Jumper terminals Tc and E1 of check connector. See Figure. If a malfunction is detected, 4 seconds will elapse and ABS light will begin to flash a 2-digit code. First number of blinks will equal first digit in a code. After a 1.5-second pause, second number of blinks will equal second digit in a code.
  5. If 2 or more codes are stored, there will be a 2.5-second pause between each code. After all codes are flashed, there will be a 4 second pause and all codes will repeat.
  6. Record diagnostic codes. Turn ignition off. Repair as necessary. See SPEED SENSOR DIAGNOSTIC CODES . Remove jumper wire from check connector. Clear diagnostic codes. See CLEARING CODES .
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