DTC Confirmation Test (Using Generic Scan Tool)
WARNING: This page is about a different car, the 2002 Nissan Pathfinder and 2002 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the following test to check overall function of vacuum cut valve by-pass valve. During this test, 1st trip DTC may not be confirmed.
Remove vacuum cut valve and vacuum cut valve by-pass valve as an assembly. See Figure . Apply vacuum to port "A". See Figure . Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. Using jumper wires, apply battery voltage to by-pass valve terminals. Air should flow freely through ports "A" and "B" in both directions. If operation is as specified, system is okay at this time. If operation is not as specified, go to DIAGNOSTIC PROCEDURE .