Perform Active Test Using Intelligent Tester Purge

Hose (to canister)

Hose (to canister)


(a) On the intelligent tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II/ ACTIVE TEST / EVAP VSV.

(b) Disconnect the hose (connected to the canister) from the purge VSV.

(c) Start the engine.

(d) Using the tester, turn off the purge VSV (EVAP VSV: OFF).

(e) Use your finger to confirm that the purge VSV has no suction.

(f) Using the tester, turn on the purge VSV (EVAP VSV: ON).

(g) Use your finger to confirm that the purge VSV has suction.



Test Results

Suspected Trouble Areas

Proceed To

No suction when Purge VSV turned OFF, and suction applied when turned ON

Purge VSV normal


Suction applied when purge VSV turned OFF

Purge VSV stuck open


No suction when purge VSV turned ON

• Purge VSV stuck closed

• Problems with EVAP hose between purge VSV and intake manifold


(h) Reconnect the hose.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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