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Old 04-18-2005, 12:35 PM   #1
oregonsixteen
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Join Date: Apr 2005
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Vehicle:
1991 Legacy L AWD
Some kind of gold

OMGHi2U purge canister solenoid valve

what is it? and what does it do?
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Old 04-18-2005, 02:02 PM   #2
Legacy777
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it's part of the evaporative emissions control system. It's a solenoid. It's connected to the charcoal canister that absorbs fuel vapors from the tank. When the engine is at a certain rpm and above, the ECU will open the solenoid, vacuum from the intake will suck the vapors out of the charcoal canister.
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Old 04-18-2005, 02:04 PM   #3
oregonsixteen
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Quote:
Originally Posted by Legacy777
it's part of the evaporative emissions control system. It's a solenoid. It's connected to the charcoal canister that absorbs fuel vapors from the tank. When the engine is at a certain rpm and above, the ECU will open the solenoid, vacuum from the intake will suck the vapors out of the charcoal canister.
so that's different from the pcv (purge control valve) right? i got a quote from the dealer, a replacement costs $89.63 (part only)!!!

i increased the RPM and found that the solenoid did open the valve, i.e. i could feel the vacuum suction come through although it is weaker than the suction at the intake. is this a binary device? i.e. full-open, full-close? or can it be partially-open/closed?
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Old 04-24-2005, 01:43 AM   #4
oregonsixteen
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Some kind of gold

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Hi all!

I've confirmed that the solenoid is working. When I supplied 12 VDC to it, it operated normally. The resistance across its terminal is measured at 56 ohm which is within normal operating range.

I put a voltmeter across the incoming terminals with the engines running and I measured 12 VDC. When I connect the solenoid to it, it doesn't operate. When I connect a 12V light bulb (0.93 mA) across it, it doesn't light up. I'm baffled! Please help me!
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Old 04-24-2005, 07:40 AM   #5
redwagon
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From the ECU pinout it looks like there should be battery voltage on one of the terminals at any time the ignition is on. The other wire from the ECU will be at battery voltage when the solenoid is off, and drop to under 1V to switch it on.
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Old 07-21-2005, 05:58 PM   #6
oregonsixteen
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Thanks for all your replies. I ended up replacing the purge valve solenoid. But the Check Engine Lights won't go away. My local dealer says that's a "hard code" and needs a scan tool to reset. Disconnecting the battery won't work. Is that true?

Quote:
Originally Posted by redwagon
From the ECU pinout it looks like there should be battery voltage on one of the terminals at any time the ignition is on. The other wire from the ECU will be at battery voltage when the solenoid is off, and drop to under 1V to switch it on.
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