How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Greg A Your Own Question

Greg A
Greg A, Master Troubleshooter
Category: Chevy
Satisfied Customers: 6051
Experience:  Working with Electronics & Cars for 25+ Years
5229702
Type Your Chevy Question Here...
Greg A is online now
A new question is answered every 9 seconds

1998 Chevy Venture: Van..I have a P1665 Evap Circuit Code..OBD2..leak

Customer Question

1998 Chevy Venture Van 3.4 L, I have a P1665 Evap Circuit Code that reads 2 different messages on my OBD2 (Mfg Control )1: auxiliary input 2: auxiliary output. I have replaced all the components in the Evap circuit and checked every line for a vac leak. Yet the light comes back on even after I clear it with the same message.   New Parts I have installed solenoid control valve, vent valve and the charcoal canister. John Sovie Marietta, GA. 30064
Submitted: 5 years ago.
Category: Chevy
Expert:  Greg A replied 5 years ago.

Hi John & Welcome,

 

Let me give you the test chart for this particular code. If you have a multimeter, you should be able to do some of the tests listed and hopefully figure out what is happening here.

 

P1665 Chart

 

Here is an enlarged version of the schematic that is in the procedure.

 

graphic

 

Please let me know you find or if you have more questions.

 

Good Luck & Take Care, Greg A.

Greg A, Master Troubleshooter
Category: Chevy
Satisfied Customers: 6051
Experience: Working with Electronics & Cars for 25+ Years
Greg A and 6 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.

Greg,

 

I'm out in left field on this, I have no idea on how to work a multimeter, even if I had one.

 

I will accept your answer and hopefully I can find someone who could do this for me.

 

In your opinon it is definitely an electrical problem.

 

John

Expert:  Greg A replied 5 years ago.

Hi John & Thanks for the accept.

 

After reviewing the procedure again, it looks like most of the entire test process is looking for open or shorted wires between the Powertrain Control Module (PCM) and the EVAP components.

 

If you have a friend that is familiar with basic electronics, they should be able to help you. But if you have been in there already, replacing everything that you have replaced, you may be able to do a careful inspection of the wiring and connectors and be able to find something loose or two things touching that are not supposed to be.

 

Thanks, XXXXX

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics