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ACIS Circuit

  1. Check ACIS Vacuum Switching Valve (VSV). See Figure. See AC IS VACUUM SWITCHING VALVE (VSV). If VSV is okay, pull back the right front floor mat. Remove ECM protective cover. Connect Check Harness (09990-01000) between ECM and harness. See USING CHECK HARNESS  under INTRODUCTION. Turn ignition on.
  2. Measure voltage between chassis ground and terminal No. 39 of ECM connector "B" (Green/Red wire). To identify ECM connectors and terminals, see Figure.
  3. If battery voltage is present, check for faulty vacuum tank or hoses. See ACIS VACUUM TANK . If battery voltage is not present, check for open or shorted circuit between EFI main relay and ECM. If circuit is okay, replace ECM.
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