How do I test the Canister Purge Regulator Valve (9C915)?

With the valve de-energized, apply 5 in-Hg of vacuum to the "vacuum source" port, the valve should not pass air. Then apply 9 to 14 volts DC to the valve, it should open and pass air. If it fails either test, replace the valve.

What voltage is used to energize the canister purge valve during testing?

9 to 14 volts DC. While energized, the valve should open and pass air.

How much vacuum is applied when testing the purge valve de-energized?

5 in-Hg applied to the "vacuum source" port; the valve should not pass air when de-energized.

What ports are shown on the Canister Purge Regulator Valve in Figure 11?

Three connections are labeled: CANISTER, CARB, and VACUUM SOURCE.

What should I do if the valve passes air while de-energized?

Replace the valve, a de-energized valve that passes air has failed the test.

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Ford Canister Purge Regulator Valve (CANP 9C915) Test Procedure - Figure 11

Canister purge regulator valve test procedure with line drawing, Figure 11

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Service procedure for testing the canister purge regulator valve, with voltage/vacuum test steps and a labeled drawing of the valve (Figure 11).

AI caption February 2016 · Photo 1753 of 1787

This document is a one-page service procedure describing how to test the Canister Purge Regulator Valve (part reference 9C915), a component of the evaporative emissions control system. Two test steps are given. First, with the valve de-energized, the technician applies 5 in-Hg of vacuum to the "vacuum source" port; a good valve should not pass air, and if it does, the valve must be replaced. Second, while applying 9 to 14 volts DC to the valve, the valve should open and pass air; if it does not, the valve should be replaced. The page includes Figure 11, a line drawing of the Canister Purge Regulator Valve showing three ports labeled CANISTER, CARB, and VACUUM SOURCE, with drawing reference number A9386-A. The document gives a reader the pass/fail criteria for bench-testing this solenoid-operated purge valve using only a hand vacuum pump and a DC voltage source. It was uploaded as part of an album of 1990 Ford Bronco emissions system documents, though the page itself does not state a specific vehicle year, model, or engine.

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Frequently asked questions

How do I test the Canister Purge Regulator Valve (9C915)?: With the valve de-energized, apply 5 in-Hg of vacuum to the "vacuum source" port, the valve should not pass air. Then apply 9 to 14 volts DC to the valve, it should open and pass air. If it fails either test, replace the valve.
What voltage is used to energize the canister purge valve during testing?: 9 to 14 volts DC. While energized, the valve should open and pass air.
How much vacuum is applied when testing the purge valve de-energized?: 5 in-Hg applied to the "vacuum source" port; the valve should not pass air when de-energized.
What ports are shown on the Canister Purge Regulator Valve in Figure 11?: Three connections are labeled: CANISTER, CARB, and VACUUM SOURCE.
What should I do if the valve passes air while de-energized?: Replace the valve, a de-energized valve that passes air has failed the test.