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Rationality Tests

  1. The rationality check of the switch, solenoid and seal will be performed as follows:
    • At key-on, the NVLD solenoid will be energized to vent any vacuum that may be trapped in the evaporative system from the previous soak. This should result in an open switch condition.
    • The solenoid will be de-energized (to seal the system) at the point where purge begins. The system / NVLD component rationality passes for that drive cycle if the switch closes after purge begins.
    • The solenoid is then re-energized for the remainder of the drive cycle.
    • If the switch events are not seen in a certain period of time, the rationality check will have failed (2 trip rule).
  2. Purge Flow:

    The above rationality check is considered sufficient to confirm purge solenoid function and con-formance with the purge flow test requirement. The Purge Flow Monitor is passed based on switch activity when purge is turned on or based on a rich fuel control shift when purge is turned on.

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