Read the monitor as a sequence
The source article describes purge drawing vacuum, the vent sealing the system, and the controller watching pressure feedback. It then describes stopping purge and observing vacuum decay. The ordering below summarizes that explanation; enable conditions, thresholds and timing require the actual vehicle procedure.
- Meet application conditions
- Draw vacuum and seal vent path
- Stop purge / hold sealed
- Observe pressure over time
- Evaluate recovery / vent response
| Observed behavior | Question to retain |
|---|---|
| Vacuum is not reported. | Is the pressure feedback trustworthy, and were the required system states achieved? |
| Vacuum is reported to decay. | What part of the system was included and under which conditions? |
| A functional recheck passes. | Was a later emissions monitor actually completed, or only the commanded check? |
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Match the explanation to the vehicle
Confirm the system diagram, required operating conditions and exact monitor description. The source does not establish verified thresholds, timing, wiring or application coverage for your vehicle.
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Sources, review and limits
Prepared by GoTech with AI assistance. Source wording and the bounded educational interpretation were checked in two reasoning passes by the same assistant. Technician review is pending; vehicle-specific service information and visual details have not been independently verified. Original source files remain unchanged.
- Read the monitor as a sequence
- Original GoTech purge/seal article, published 2022-04-07. Concept sequence, not a commanded test or universal monitor algorithm. Original GoTech article
About older links to this guide
This guide has been rewritten around the available source evidence. An older section link may land here; use “In this guide” above to find the revised explanation. Original source files are retained in GoTech’s review history.