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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. Using a jumper wire, jumper check connector terminals Ts and E1 of DLC1. See Figure-Figure . Start engine. Ensure ABS light blinks 4 times per second. If it does not, go to ABS WARNING LIGHT .
  3. Drive vehicle straight ahead faster than 28 MPH for several seconds without depressing brake. Stop vehicle. Jumper terminals Tc and E1 of DLC1. On 2000 models, terminals Ts and CG of DLC3 may be used instead. See Figure. Observe ABS warning light. If a malfunction is detected, 4 seconds will elapse and ABS 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.
  5. Record speed sensor DTCs. See DTC DEFINITIONS . Turn ignition off. See FRONT SPEED SENSORS , REAR SPEED SENSORS  and SENSOR ROTORS  under COMPONENT TESTS. Repair as necessary. Remove jumper wires. Clear DTCs. See CLEARING DTCS .
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