Canister Closed Valve

Brian Owner Ohio Posted   Latest  
Unsolved
Driveability
2010 Kia Soul Sport 2.0L (2) 4-spd (A4CF2)
P0455 — EVAP System Leak Detected (large leak),
Canister Closed Valve Vent Valve

Hello, Working on some scope training at a shop today and we are taking a look at the Vent valve of this vehicle. When commanded on it buzzes ( not the Clunk) that I was expecting. Also the pcm is always commanding a pulse KOEO and KOER, enough to light techs noid light. Is this normal? any ideas?diag​.​net/file/f3rojvl17…

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Caleb Technician
Indiana
Caleb Default
 

I'm sure others are more knowledgeable than me on this but I'll give it a shot. The PCM is constantly monitoring the circuit for faults with the small duty cycle your seeing there. This is normal operation. Recently had an 07 Elantra with an EVAP issue and during my diag I had too scope the purge an vent control circuits. My operation was the same and was normal. Also not trying to give a silver…

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Brian Owner
Ohio
Brian Default
   

Just to make sure I was clear ( I cound not find the closed valve on the list of components for the PICO scope so I listed Purge), with Vent in the notes. I was testing the Vent / closed valve.

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Caleb Technician
Indiana
Caleb Default
   

Gotcha. But yes the PCM tests both components the same way.

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Brian Owner
Ohio
Brian Default
 

Ok thanks for help!

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Ray Diagnostician
Ontario
Ray Default
 

This capture is from a 2014 Elantra. CH B is the VCT solenoid voltage. In CH C, I connected a jumper wire on the solenoid's control wire. The amp clamp is on the jumper wire and I am tapping the jumper wire to ground. You can see the amperage draw, thru the winding, that is required to create the magnetic field, to lift the solenoid's pintle from it's normally closed position.

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Randy Curriculum Developer
North Carolina
Randy Default
 

That's a great image of how the solenoid reacts to manually grounding the circuit. Do you happen to have the same capture when the solenoid is commanded on by the PCM during a bi-directional command?

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Ray Diagnostician
Ontario
Ray Default
 

Sorry Randy, I didn't try to use the bi-directional command because I found that the Snap On scanner does not always support the bi-directional command for all makes and models, for all of the solenoids.

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Randy Curriculum Developer
North Carolina
Randy Default
 

Understand....thanks for the quick reply.

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