2011 Volt p2418 -Fixed

I'm getting a leak detection pump switching valve control circuit code and am not sure where this part is to do any tests. I have some actuation tests in my scan tool and here is what i see in the switching valve screen.

Code comes up immediately after clearing and turning the car back on. Im guessing the LD pump has the valve in it and there is a wire issue somewhere?



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do you have bu directional controls for the evap system? should have power on the red/white wire and a control of a ground on the gray wire. my guess is you wont find power

cheryl hartkorn wrote: do you have bu directional controls for the evap system? should have power on the red/white wire and a control of a ground on the gray wire. my guess is you wont find power

The diagram has two red/white wires. One has 12v on my meter but won't shine my test light at all. The other has a strange constant v fluctuation. Not ghost v but some steady switching going on in the mv and like .6 v range. The motor activates with the scan tool. I paid $20 to get Mitchel 1 for this car and seem to have isolated the problem to be on the power side. I'm helping a friend out here and have limited experience actually finding wire faults like this.

Side note - The light blue wire has 3v on it for some reason.

What is this j376 thing?



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Tutti57 wrote: What is this j376 thing?

Junction #376

It supplies power from the 10 amp fuse (in the left rear corner of luggage compartment) to the two RED/WHT wires at the Evap LD Pump assy and to the vent solenoid.

The diagram has two red/white wires. One has 12v on my meter but won't shine my test light at all.

You, may, have a voltage drop. Check to make sure your test light has a good ground. Both RED/WHT wires should light your test light, brightly (as should the RED/WHT wire at the vent solenoid). What does your voltmeter read when the test light AND voltmeter are used at the same time?

J376 may be where your problem lies.

Ok. Am getting voltage drop according to loadpro. I'm interested in checking out that junction. Does this mean it's in that location in the loom? Thanks for the info.

It's number 6 here.


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Tutti57 wrote: Does this mean it's in that location in the loom?

Yes. Mitchell describes it as "In the evaporative emissions harness approximately 18.5 cm (7.28 in) from the X355 Connector Breakout" Underbody Harness. To rear of tank.

It was corrosion on the power wire to the LD pump in that junction. Thanks for the help.

I was also getting voltage drop on the vent valve power wire. I had 12v in most places I should have, but not enough current to make my test light shine at all. Mitchel 1 showed the junction being in a section of the harness back there. I cut it open and found that under the wrap at the junction the wires were all corroded green.

I did a bunch of different tests and raised my confidence on electrical work. I learned a lot tonight.



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Well done.

Tyler wrote: Well done.

Well done indeed!

I have to say again that this is the best forum I have ever been a part of. No negative nonsense, trustable people, and a great community. Nice job to Paul for putting this together and choosing the right mods to help out. So glad I found this place to continue learning!

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Thanks! You gotta give yourself a pat on the back. SO MANY techs out there wouldn't have touched this one. Partly because it's a Volt, partly cause it's a P2XXX code. :lol:

Thanks for posting this great info! My dad's 2012 volt had the same exact failure; corrosion at the J375 junction causing low voltage at pins 3 and 5 of the EVAP leak detection pump. We measured 1.6volts on the red/white wires of the Q63 connector, but had 12volts on the read/white of the Q13 connector. We were able to track down the junction point after cutting into the harness in a few places. Here are some photos from our job.