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Test 7: Valve Relay Problem

  1. Turn ignition off. Disconnect ABS control unit harness connector. Turn ignition on. Measure voltage between ABS control unit harness connector terminals No. 1 and 20. See Figure . If battery voltage is not present, inspect and repair circuit(s) as necessary. See WIRING DIAGRAMS  . If battery voltage is present, go to next step.
  2. Turn ignition off. Remove ABS harness connector cover. Connect ABS control unit harness connector. Turn ignition on. Using voltmeter, backprobe harness connector. Measure voltage between terminals No. 17 and 20. See Figure . If battery voltage is not present, replace ABS control unit. If battery voltage is present, go to next step.
  3. With ABS harness connector still connected, backprobe between connector terminals No. 20 and 32. If battery voltage is not present, go to next step. If battery voltage is present, replace ABS control unit.
  4. Turn ignition off. Disconnect ABS harness connector and hydraulic unit harness connector. Check for continuity between ABS control unit harness connector and hydraulic unit harness connector. See Figure and Figure . See HARNESS CONTINUITY CHECK table. If continuity exists, go to next step. If continuity does not exist, inspect and repair circuit as necessary. See WIRING DIAGRAMS  .
    HARNESS CONTINUITY CHECK

    ABS Control Unit Terminal No. Hydraulic Unit Terminal No.
    17 6
    32 11
    27 12
  5. Turn ignition off. Disconnect hydraulic unit 2-pin harness connector. Measure voltage between harness connector terminal No. 1 (White/Green wire) and ground. If battery voltage is not present, inspect and repair circuit as necessary. See WIRING DIAGRAMS  . If battery voltage is present, go to next step.
  6. Remove hydraulic unit valve relay. Hydraulic unit valve relay (5-terminal) is located on hydraulic unit. Check continuity of relay. See Figure . With battery voltage connected between terminals No. 85 and 86, continuity should exist between terminals No. 30 and 87. Continuity should not exist between terminals No. 30 and 87a.
  7. Without battery voltage applied, continuity should exist between terminals No. 30 and 87a. Continuity should not exist between terminals No. 30 and 87. If continuity is not as specified, replace relay. If continuity is as specified, replace hydraulic unit.
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