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All Models

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1989 Audi 90, 1989 Audi 80, 1989 Audi 200, 1989 Audi 100, and 1988 Audi 90. However, it is still accessible from the selected car via links, so may be relevant.
  1. Item Being Tested - Return Pump Relay (Off Position) With ignition on, place ABS tester in program switch position No. 3. Lamps No. 1 and 3 (Green) must come on. If lamps come on, TEST 3 is completed.
  2. If lamp No. 4 (Red) comes on, replace defective return pump relay. After replacing relay, check that ground lead for hydraulic modulator is tight. If okay, turn ignition off and remove plug connector on hydraulic modulator.
  3. Use ohmmeter to check continuity between terminal No. 9 in socket on hydraulic modulator and terminal No. 30 in relay socket for return pump. If there is no continuity, replace hydraulic modulator. If continuity exists, go to next step.
  4. Use ohmmeter to check continuity between terminal No. 9 in socket on hydraulic modulator and positive terminal on return pump. See Figure - Figure . If there is no continuity, replace hydraulic modulator. If continuity exists, go to next step.
  5. Use ohmmeter to check continuity between terminal No. 9 in plug for hydraulic modulator and terminal No. 14 in plug for ABS control unit. If there is no continuity, repair wiring harness to restore continuity.
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