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Speed Sensor Diagnostics

NOTE: While diagnosing speed sensors, brake system functions as a conventional system.
  1. Ensure battery voltage exists. 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 28 MPH for several seconds. Stop vehicle. 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.
  4. 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.
  5. 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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