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Home >> Nissan-Datsun >> 2002 >> Frontier Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0456: EVAP Control System Very Small Leak (Negative Pressure Check) Or DTC P1456: EVAP Control System Very Small Leak (Positive Pressure Check) >> DTC Confirmation Test (Using Generic Scan Tool)
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DTC Confirmation Test (Using Generic Scan Tool)

NOTE: Use the following test to check overall function of EVAP very small leak function. During this test, DTC may not be confirmed.
CAUTION: To avoid damage to EVAP system, do not use compressed air. Do not start engine. Do not exceed .6 psi (4.12 kPa).
  1. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. See Figure or Figure . Connect a suitable pressure pump with hose and gauge to adapter.
  2. Turn ignition on. Using scan tool, select MODE 8 to close EVAP-CVCV and open vacuum cut valve bypass valve. Apply .39 psi (2.7 kPa) to EVAP system.
  3. Observe gauge for 60 seconds. If pressure drops more than .06 psi (.4 kPa), go to DIAGNOSTIC PROCEDURE  . If pressure does not drop more than .06 psi (.4 kPa), system is okay at this time.
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