If a normally closed canister purge solenoid allows vacuum flow when tested, what can be inferred?

If a normally closed canister purge solenoid allows vacuum flow when tested, it indicates that the solenoid is functioning in a manner contrary to its design. Typically, a normally closed solenoid should prevent vacuum flow when de-energized. If vacuum flow is occurring, this suggests that there is an issue with the solenoid itself, such as it being stuck open or improperly functioning, rather than pointing directly to an issue with the power circuit.

When considering the possibility of the power circuit being at fault, it is essential to understand that if the circuit supplying power to the solenoid were to malfunction, the solenoid would not operate correctly but would not necessarily result in vacuum flow when tested. Thus, from the test result showing vacuum flow, you could deduce that the power circuit might be functioning properly, but the solenoid is still not performing as intended.

As a result, the correct inference from this scenario is that the power circuit is likely still intact, leading to the conclusion that only the solenoid itself is at fault and not the power circuit. This distinction clarifies that while the test results indicate a malfunction, they do not implicate both components involved. Hence, the assessment that the power circuit is at fault overlooks the evidence provided by