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Speed Sensor Diagnostics

NOTE: While diagnosing speed sensors, brake system functions as a conventional system.
  1. Turn ignition on. Ensure ABS warning light illuminates, then goes out after about 3 seconds. If ABS warning light does not illuminate, check fuse, bulb and wiring harness. See ABS WARNING LIGHT .
  2. Turn ignition off. Using a jumper wire, jumper terminals Ts and E1 of DLC1. See Figure. Start engine. Ensure ABS warning light blinks 4 times per second.
  3. Drive vehicle straight ahead at 28 MPH or more for several seconds without depressing brake. Stop vehicle and turn ignition off. Connect jumper wire between terminals Tc and E1 of DLC1. See Figure. Turn ignition on. If a malfunction is detected, 4 seconds will elapse and ABS warning light will begin to flash a 2-digit DTC. First number of blinks will equal first digit in DTC. After a 1.5-second pause, second number of blinks will equal second digit in DTC.
  4. If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are flashed, there will be a 4 second pause and all DTCs will repeat. Record speed sensor DTCs. Turn ignition off. Repair as necessary. See DTC DEFINITIONS . See FRONT SPEED SENSORS , REAR SPEED SENSORS  and SENSOR ROTORS  under COMPONENT TESTS. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES .
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