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Home >> Chevrolet >> 1999 >> Astro Van L AWD V6-4.3L VIN W >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> Small Leak Test
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Small Leak Test

PASS/NOT RUN/FAIL
The Small Leak Test runs immediately after the Weak Vacuum Test. The EVAP system is closed and the fuel tank vacuum is monitored by the VCM. A slow loss of vacuum rate will cause this test to fail. This test will indicate either Pass or Not Run/Failed.
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