2015 Volvo Evap leak

Dane Technician Lincoln, Nebraska Posted   Latest  
Question
Driveability
2015 Volvo XC60 T5 2.0L (40 B4204T11) 6-spd (TF-80SC AWD)
P0442 - EVAP System Leak Detected (small leak),
P0455 - EVAP System Leak Detected (large leak),

I'm having trouble finding testing procedures and description and operation for this vehicle. This system has a DMTL unit. The only info I have gotten basically just tells me to smoke the system for leaks and to run the fuel system quick test with the scan tool. I can control the purge solenoid on with scan tool as well as here it run while vehicle is running. I've smoked the system with DMTL unhooked from the tank and found no leaks. With the DMTL hooked up I get smoke from the filter which I assume is normal? During the quick test I can here the DMTL run and watch the fuel tank pressure increase on scan tool as it should from my understanding but the test results come back with "fault found". My question is how can I "manually" test the DMTL? Can I make it seal off from the filter side like a vent solenoid or is it bad because it isn't sealing to the filter when not operating?

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Jeff Owner/Technician
Baldwinsville, New York
Jeff Default
 

Which scan tool are you using, can you watch purge valve percentage and see if it is climbing as well as tank pressure? The DMTL reads resistance which translates to pressure when the purge valve is pulling vacuum. If you disconnect the hard line for the vent at the DMTL and put your thumb over it, it should pull vacuum on your thumb and you will hear it sucking air from the gas cap and then you…

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Mihail Technician
Rockville, Maryland
Mihail Default
   

I wish I knew more about the system on this Volvo to help you but the first thing you should do is remove the purge valve - you may only disconnect the Tank side and make sure it does not leak vacuum when closed. Hearing it clicking means the electric portion works but you don’t know about the mechanical. This is a common problem all electro-mechanical devices have. I have changed purge valves…

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Sam Owner/Technician
Tampa, Florida
Sam Default
 

Used to work at the dealer and 90% of the time it’s the DTML, if I’m not mistaken, it watches current draw, as it draws a vacuum the current consumption increases, it then watches the pressure sensor and looks for a leak, but if the current stays consistent and there is no change in pressure from the sensor, it sees it as a major leak, problem is, with age the pump gets weak and fools the…

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Bill Instructor
Melrose Park, Illinois
Bill Default
 

Mayby this will help, seems pretty detailed article autoserviceprofessional​.​com/article/100121…

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Helpful
Dominick Technician
Bernardsville, New Jersey
Dominick Default
 

Great article!

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Mihail Technician
Rockville, Maryland
Mihail Default
 

Just read the article that Bill sent, thanks Bill and it says most DMTL pump are Bosch and the same design - there is a picture of a typical bmw dmtl module . Mentions Vovlo uses them too. If you have such a module on your Volvo, in my experience with BMW, DTML modules always set codes when failing which is confirmed by the fact they are very accurate because they self-calibrate before each…

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Dane Technician
Lincoln, Nebraska
Dane Update
 

Thank you all for the replies! That article Bill shared was extremely helpful. I double checked the purge solenoid for leaking while closed and it was not leaking. I plugged off the line to the filter and smoked the system again and my flow meter went down nothing so I'm confident I don't have a leak in the system. I did find however, that while I was running the purge solenoid I could hear an…

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Richard Technician
Stony Brook, New York
Richard Resolution
 

I took a look at a picture of the DTML and it is the same pump they use on BMW. I have found several of these that leak where the electrical connector plugs into the pump. The first one drove me a little crazy, I pulled the pump put a small amount of water if the connector and blew into one of the ports while blocking off the other port with my thumb and you could see the water bubbling like…

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Helpful
Dane Technician
Lincoln, Nebraska
Dane Default
 

Thank you Richard, this one was leaking through the electrical portion of the DTML. I accidently "fixed" this vehicle after smoke testing it the first time and having it leak from the fresh air filter. While checking the electrical portion of the DTML I unplugged it and had some trouble plugging it back in and used dielectric grease on the connector seal to allow the connector to fully plug it…

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Frank Owner/Technician
Toronto, Ontario
Frank Default
 

Excellent find and thanks Richard.

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Mihail Technician
Rockville, Maryland
Mihail Default
   

Very helpful. Learned something new from you Dane, Richard and everyone else. Thanks for persevering and figuring it out.

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Dane: The takeaway should be don't contaminate the crime scene. Guido

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Vincent Owner/Technician
Mount Kisco, New York
Vincent Default
 

I recently had a similar problem with the identical vehicle and dtc's. After smoking and testing valve mechanical integrity, I found nothing. I discussed this problem with a master Volvo tech and he recommended I look carefully at the filler neck. There is covering and insulation on the pipe that you need to remove and scrape any rust area to see if smoke is visible. I was able to smell the…

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Mihail Technician
Rockville, Maryland
Mihail Default
 

I want to add that as we are discussing this here an old customer with a 2004 bmw 330ci dropped his car for failing emission - apparently the car has the same dmtl pump as the volvo we are discussing here. I scanned the car and found codes for evap small leak and purge valve intermittently not working. I checked the purge valve and decided to replace it even though it was not leaking - they are…

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Mihail: Using generic codes on a BMW/Mini will lead you astray. They do not convert well to SAE codes. I've seen 5 different OEM codes that were allegedly translated to P0171. The smart money says to always use the OEM codes. HTH, Guido

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Mihail Technician
Rockville, Maryland
Mihail Default
 

True, can’t trust generic. I have seen cars with no generic codes in the ecm only to find some when checking with the oem tool.

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