Evap Canister Purge Solenoid Diagnosis - DodgeForum.com

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Evap Canister Purge Solenoid Diagnosis

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Old 06-21-2008, 11:48 AM
mills9 mills9 is offline
Join Date: Mar 2005
Posts: 11
Default Evap Canister Purge Solenoid Diagnosis

Hello All,

I have a 1997 Ram 1500, 5.2L Auto 4x2. My MIL came on and after cycling the ignition switch on-off-on-off-on, I get code 31, which indicates a problem with the Evap Canister Purge Solenoid Circuit. How can I confirm that it's the solenoid that's bad, as opposed to an electrical problem? Do I test the voltage to the solenoid with the engine running and warmed up? Is it 12v that I'm looking for? Or can I just do a continuity test on the solenoid itself (with electrical disconnected)? Thanks for any help!
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Old 09-10-2008, 09:10 PM
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Keegan Keegan is offline
Join Date: May 2008
Vehicle: 1995 Dodge Ram 1500 4x4 5 spd
Location: Ontario, Canada
Posts: 243

I have the same code and was also wondering what I can do to get rid of it. Maybe just go to the wreckers and price a used solenoid?

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Old 09-11-2008, 09:44 AM
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Gary-L Gary-L is offline
Join Date: May 2005
Vehicle: 2007 Ram 1500 4x2 Big Horn aka The Silver Bullet
Location: Norman, Okla-mobile-homa
Posts: 8,394

Don't believe it could be a faulty solenoid. I get the error from time to time and it's because I've had fuel "waterlog" my charcoal filter. One of these days, I'm going to replace the charcoal and filter element.
You can have my Oxford comma when you pry it from my cold, dead, and lifeless hands.
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Old 09-11-2008, 09:50 AM
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cars01010 cars01010 is offline
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The Powertrain Control Module (PCM) operates the EVAP/Purge solenoid by providing a ground path on circuit K52. Circuit K52 connects to PCM cavity C20. Circuit F18 supplies battery voltage to the EVAP/Purge solenoid.

In the RUN or START position, the ignition switch connects circuit A1 from the Power Distribution Center (PDC) and circuit A21. Circuit A21 feeds circuit F18 through fuse 9 in the fuse block.
Circuit F18 splices to supply battery voltage to the EGR solenoid and connects to cavity A2 of the PCM.

It is what it is
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Old 09-20-2011, 08:32 AM
Worme Worme is offline
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Join Date: Sep 2011
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I know this is a old post but was the issue solved and what was done? I am having this trouble and it is comming and going.
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