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Home >> Nissan-Datsun >> 2003 >> Frontier Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1491: Vacuum Cut Valve By-Pass Valve >> DTC Confirmation Test (Using Generic Scan Tool)

DTC Confirmation Test (Using Generic Scan Tool)

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  .

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