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 1765 of 1799

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.