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Test 9: Valve Relay Problem

  1. Turn ignition off. Disconnect ABSCM/HU connector. Start engine and run at idle. Measure voltage between ground and ABSCM/HU connector terminals No. 1 and 24. See Figure. If voltage is 10-15 volts, go to next step. If voltage is not 10-15 volts, repair wiring harness between battery and ABSCM/HU.
  2. Turn ignition off. Measure resistance between ground and ABSCM/HU control terminal No. 23. If resistance is less than .5 ohm, go to next step. If resistance is more than .5 ohm, repair wiring harness between ground and ABSCM/HU.
  3. Measure resistance between ABSCM/HU terminals No. 23 and 24. See Figure. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, replace ABSCM/HU.
  4. Check contacts at battery, generator and ABSCM/HU connectors. Clean contacts as needed. Go to next step.
  5. Reconnect all connectors. Erase memory. Recheck for trouble codes. If same trouble code returns, replace ABSCM/HU. If other trouble codes exist, go to proper test procedure. If no trouble codes exist, problem was a temporary poor contact. Check harness and connectors.
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