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 Matt J Your Own Question

Matt J
Matt J, ASE Certified Technician
Category: Car
Satisfied Customers: 1399
Experience:  ASE Certified Master Tech,10+ Yrs Experince All Makes,Advance Training GM, Toyota ,VW, Kia,Plus More
14582819
Type Your Car Question Here...
Matt J is online now
A new question is answered every 9 seconds

Emission..the ecu/ecm/pcm, what can I do

Resolved Question:

When emission testing, the state inspectors could not communicate with the ecu/ecm/pcm, what can I do?
Submitted: 3 years ago.
Category: Car
Expert:  Matt J replied 3 years ago.

Matt J :

Hello my name is XXXXX XXXXX I will be more than happy to assist you.

Customer :

Hi, I'm Rich

Matt J :

Hello Rich. I would like to start off by checking two fuses. Give one min to load up the location of them

Customer :

I can give you the pinout of my dlc connector pins 2,3,4,5,7

Customer :

and pins 9,11,12,16

Customer :

ok

Matt J :

Yes I can get you that info also.

Customer :

I can give you the fuse locations if you want

Customer :

the interior fuse for the DLC is #2

Matt J :

Ok you have already check #2

Matt J :

Do you have a volt meter or test light?

Customer :

I think that I have checked that fuse already yes

Customer :

I do have volt meter and test light

Matt J :

ok good. Turn the key on ground the test light lead to a clean metal surface, make sure it works, and test slot 16 at the DLC connector. Does the test lamp light?

Full Size Image

Customer :

ok i will look

Matt J :

No problem take your time.

Matt J :

I have to step away for about 5 min. I will be right back

Matt J :

I am back

Customer :

I'm not getting any congenuity anywhere do I have to have to key on?

Matt J :

Yes the key does need to be on

Customer :

I have grounded my test light on metal petal and probe light to all available pins and I got no congenuity

Customer :

it's funny because I have gotten continuity in the past

Customer :

I checked the 10 amp fuse for the dlc and replaced it

Customer :

it was ok and I did that before i tested for continuity

Matt J :

Then lets do this. Go to Fuse #2, ground the test light, Turn the key ON, And touch the test light to the little metal tabs on the fuse. Does the test lamp light up at both metal tabs on the fuse.

Customer :

ok

Customer :

I'm not sure how you can insert the fuse into its socket and test the two tabs, i did test the fuse itself

Customer :

i dropped the little 10 am

Customer :

I dropped the little 10 amp fuse and replaced it with the larger american size

Customer :

what now?

Matt J :

Ok give me one min

Matt J :

With the fuse still installed you will two metal tabs. You will want to touch the test light to each tab and have the test light lead grounded to a clean metal surface. Test needs to be done with the key ON.

Full Size Image

Customer :

ok

Customer :

Used two paper clips no conginuity

Customer :

I've got to go in about 5 minutes

Customer :

that's what happens when your granddaughter has to get to dance class

Matt J :

Ok if you want we can keep going later on. I will be on for atleast 6 more hours.

Customer :

Ok, thanks Matt

Matt J :

When you have a chance go to the under hood fuse box and check this fuse. See if it is blown. If it is not then check to see if it has power with the test light.

Full Size Image

Customer :

I'm Back

Customer :

I dropped two ten amp fuses under the fuse box for the dlc then had to buy some more fuses

Customer :

Matt J

Customer :

Am I still connected?

Customer :

Matt J

Customer :

Matt are you there?

Customer :

Matt J

Customer :

Matt J I have returned and would like to go over what I should do next.

Customer :

where are you?

Customer :

Matt I received the diagram of the engine compartment fuse box and I check the 30 amp fuse that you had circles in red. It was good.

Customer :

I have the same diagram in my owner's manual which describes the fuse as battery main

Customer :

Ok, thanks

Customer :

Matt are you there?

Customer :

Matt I haven't solved the problem yet, please help me to do that.

Customer :

I need to know why I don't have power to the dlc?

Customer :

Matt J please give me some more help we haven't solve the problem yet

Matt J :

Sorry I was lock into another question

Matt J :

And the system just told me 5 min ago you responded back.

Customer :

Hello hello hello

Matt J :

Did you have power at the fuse?

Customer :

no

Customer :

but why not?

Customer :

that may be the problem

Customer :

I looked at the 15 amp fuse for the ecm and it was good

Customer :

I am going to look at the interior fuse F13 ecm, tcm, vss I think I have looked that before, but I'm not sure

Matt J :

When you tested the fuse under the hood, did you hook the volt meter lead uo to the battery negitive post? And did you make sure the test light did work.

Matt J :

Not volt meter lead, Test light lead

Matt J :

The two fuses I had you check are the only ones the get power to the DLC

Customer :

F13 is ok

Customer :

What was the other fuse that you asked me to check

Customer :

??

Matt J :

Fuse #2 in the fuse block on the passenger side fuse box

Customer :

I check the battery main fuse the one you had circled and it was good. So both fuses that you asked to check were both good

Matt J :

Did you make sure the test light works?

Customer :

There must be one of the leads to the DLC that is not connected. What lead would that be

Customer :

Yes in fact i also used a volt meter

Customer :

for a continuity check

Matt J :

Take the volt meter, Touch the read lead to slot 16 at the DLC and ground the other end to a clean metal surface. What is the voltage. Test must be done with the Key ON

Customer :

ok will check

Matt J :

ok

Customer :

still no continuity

Customer :

somewhere I have a pinout diagram for that dlc, I looking for it

Customer :

pin 2 J1 850

Customer :

pin 2 J1850 Bus+

Matt J :

Try this turn the key on, touch the red lead of the volt meter to Slot 16 and the Black Lead to Slot 5

Full Size Image

Customer :

ok

Customer :

#5 pos and 16 neg 14vdc

Matt J :

so you do have voltage?

Customer :

yes

Customer :

I'm not very good at this I may have not turned the engine on on one of our tests (a little alliteration)

Customer :

I had the polarity wrong

Customer :

sorry about that

Matt J :

I thought something was not right. Give me a few min to pull up the test info again and go over everything since now we know there is power and ground at the DLC

Customer :

the pin out I have is pin2 j1850 bus+, 4 Cgnd, 5 Sgnd, 6 CAN high, 7 K-LINE ISO 9141-2 and ISO/Dis 14230-4, 10 J1850 Bus -

Matt J :

The next test I would like you to do is, Turn the Key ON, take the Volt Meter, touch the red lead to Slot 2 and the black lead to Stol 5. What is the Voltage?

Full Size Image

Customer :

14 CAN Low ISO-9141-2 and ISO 14230-4, 15 ISO 9141-2 and ISO/DIS 14230-4, 15 ISO 9141-2 TX/RX, 16 +12v Battery Power

Matt J :

The test procedure show everything I will need to assist you to find the cause.

Matt J :

The next test I would like you to do is, Turn the Key ON, take the Volt Meter, touch the red lead to Slot 2 and the black lead to Stol 5. What is the Voltage?

Customer :

0.03 v

Customer :

I have pins 2,3,4,5,7 top and 9,11,12,16 bottom

Customer :

ok, sounds good

Matt J :

The next test I would like you to do is, Turn the Key ON, take the Volt Meter, touch the red lead to Slot 16 and the black lead to Slot 2. What is the Voltage?

Customer :

-11.73 vdc

Matt J :

Ok it looks like you have a short in the Serial Data Class II wire from slot 2 to the ECM. Now you will have to follow the Purple wire from slot 2 all the way to the ECM on the passenger side of the dash. Some where along the wire you will find where it is rubbed open and touching metal or pinched.

Customer :

I will look at that just stay with me a minute

Matt J :

No problem

Customer :

anyway I won't delay you good job, thanks

Matt J, ASE Certified Technician
Category: Car
Satisfied Customers: 1399
Experience: ASE Certified Master Tech,10+ Yrs Experince All Makes,Advance Training GM, Toyota ,VW, Kia,Plus More
Matt J and 5 other Car Specialists are ready to help you
Customer: replied 3 years ago.
I need a statement of the charges for this session, so I can present them to the emissions testing facility in Belleville, IL
Expert:  Matt J replied 3 years ago.

Far as what it would cost to fix the problem or just what you spent on here.

 

On a side note you are actually only 30 to 45 min away from me. I live in St Louis

Customer: replied 3 years ago.
Relist: Other.
I want to know how much the session cost me. I believe it was $ 56.00. I need the exact amount.
rorr10
Expert:  Matt J replied 3 years ago.
I show the session cost $18 for the question and $10 for the bonus for a total of $28.00
Customer: replied 3 years ago.
Matt J:

I saw somethink like $56 + $10 = $66

Anyway $18 sound very good, thanks

Customer (Rich Orr)

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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 
Chat Now With An Auto Mechanic
Matt J
Matt J
Owner of Jones Automotive
162 Satisfied Customers
ASE Certified Master Tech,10+ Yrs Experince All Makes,Advance Training GM, Toyota ,VW, Kia,Plus More