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Speed Sensor Diagnostics

NOTE: While diagnosing speed sensors, brake system functions as a conventional system.
  1. Ensure battery is in good condition and is fully charged. Turn ignition on. ABS light should come on, then go 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 terminals Ts and E1 of DLC1. See Figure. Set parking brake. Start engine. ABS light should flash 4 times per second.
  3. Drive vehicle straight ahead above 28 MPH for several seconds. 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 terminals Tc and E1 of DLC1, 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 wire from DLC1. Clear diagnostic codes. See CLEARING CODES.
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