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Home >> GMC Truck >> 1999 >> Safari Van 2WD 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 >> Excess Vacuum Test

Excess Vacuum Test

PASS/NOT RUN/FAIL
The Excess Vacuum Test will Fail if fuel tank vacuum builds at an excessive rate during normal EVAP canister purge. A restricted vent valve or vent valve hoses will cause improper venting. The scan tool display states for this parameter are Pass and Not Run/Fail.
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