1987 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE

All Models

  1. Item Being Tested - Left Front Wheel Speed Sensor Place ABS tester in program switch position No. 11. Press button No. 8. Resistance reading on ABS tester should be 20,000-999,000 ohms. If correct, go to step 4).
  2. If reading is incorrect, turn ignition off. Disconnect plug connector for left front wheel speed sensor. Install a jumper wire across speed sensor plug connector terminals. See Figure . Repeat step 1).
  3. If resistance reading is now correct, replace speed sensor. If resistance reading is still incorrect, check wires going to terminals No. 4 and 5 (terminals No. 4 and 22 on 5000CS Quattro) in plug for ABS control unit for chafing or short to ground. After repairs, go to next step.
  4. Item Being Tested - Right Front Wheel Speed Sensor With ABS tester in program switch position No. 11, press button No. 9. Resistance reading on ABS tester should be 20,000-999,000 ohms. If reading is correct, go to step 7).
  5. If reading is incorrect, turn ignition off. Disconnect plug connector for right front wheel speed sensor. Install a jumper wire across speed sensor plug connector terminals and repeat step 4).
  6. If resistance reading is now correct, replace speed sensor. If resistance reading is still incorrect, check wires going to terminals No. 21 and 23 in plug for ABS control unit for chafing or short to ground. After repairs, go to next step.
  7. Item Being Tested - Left Rear Wheel Speed Sensor With ABS tester in program switch position No. 11, press button No. 11. Resistance reading on ABS tester should be 20,000-999,000 ohms. If correct, go to step 10).
  8. If reading is incorrect, turn ignition off. Disconnect plug connector for left rear wheel speed sensor. Install a jumper wire across speed sensor plug connector terminals. See Figure . Repeat step 7).
  9. If resistance reading is now correct, replace speed sensor. If resistance reading is still incorrect, check wires going to terminals No. 7 and 9 (terminals No. 8 and 9 on 5000CS Quattro) in plug for ABS control unit for chafing or short to ground. After repairs, go to next step.
  10. Item Being Tested - Right Rear Wheel Speed Sensor With ABS tester in program switch position No. 11, press button No. 12. Resistance reading on ABS tester should be 20,000-999,000 ohms. If correct, TEST 11 is completed.
  11. If reading is incorrect, turn ignition off. Disconnect plug connector for right rear wheel speed sensor. Install a jumper wire across speed sensor plug connector terminals and repeat step 10).
  12. If resistance reading is now correct, replace speed sensor. If resistance reading is still incorrect, check wires going to terminals No. 24 and 26 in plug for ABS control unit for chafing or short to ground.
Chapter Navigation
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.