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Old 01-01-2020, 04:07 PM #1
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question about the evap vent solenoid

1. is the vent solenoid normal open when the car is off and no power?
2. when i supply power to the vent solenoid and apply vacuum pressure, it build ups pressure and slowly leaks down (bad solenoid)? I know in the picture i have the valcume hose hooked up backwards, i tested it the other way around (right way).
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Old 01-02-2020, 10:39 PM #2
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No evap experts here? Should that solenoid hold pressure?
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Old 01-02-2020, 11:52 PM #3
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Quote:
Originally Posted by jayk2k3 View Post
No evap experts here? Should that solenoid hold pressure?
I am no expert but what little I know of evap systems. The vent solonoid is always open and the purge solonoid is closed . The pcm opens and closes the vent and purge solonoids there is a procedure for testing the solonoid in the fsm. hope it helps
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Old 01-02-2020, 11:58 PM #4
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I can post the rest of the procedure if you need or you can down load the fsm here
2000 4Runner FSM - Printable - Google Drive
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Old 01-03-2020, 10:26 AM #5
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Usually if the circuit in the solenoid is stuck or has failed, an EVAP code is triggered. Sometimes, but not for all makers, a high ohm reading can indicate that the solenoid is failed/on its way out. Sometimes just tapping on them can free them/wake them up.

My guess though is that somewhere in the EVAP system there may be a slight vacuum leak, but not large enough to trigger a code. Access to a smoke machine would help here.
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