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Speed Sensor Diagnostics

NOTE: During speed sensor diagnosis, ABS functions like a conventional brake system.
  1. Ensure battery voltage is about 12 volts. Turn ignition on. Verify ABS light comes on, then goes out after about 3 seconds. If ABS light does not come on, check fuse, bulb, and wiring harness.
  2. Turn ignition off. Connect jumper wire between DLC terminals Ts and E1. See Figure. Engage parking brake. Start engine. DO NOT press brake pedal. ABS light should flash 4 times per second.
  3. Drive vehicle straight ahead above 12.4 MPH for several seconds. Ensure ABS light turns on while braking. Drive vehicle straight ahead above 28 MPH. If ABS light displays any trouble code, go to next step. If ABS displays normal code (4 flashes per second), check is completed.
  4. Stop vehicle. Connect jumper wire between DLC terminals Tc and E1, leaving terminals Ts and E1 connected. If a trouble code is stored, 4 seconds will elapse, then ABS light will begin to flash a 2-digit code. First group of flashes will indicate first digit in code. After a 1.5-second pause, second group of flashes will indicate 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, then all codes will repeat.
  6. Record diagnostic codes. Turn ignition off. Repair as necessary. See SPEED SENSOR DIAGNOSTIC CODES. Remove jumper wires from DLC. Clear diagnostic codes. See CLEARING CODES.
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