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 Paul M ASE Master Your Own Question

Paul M ASE Master
Paul M ASE Master, ASE Master Tech
Category: Car
Satisfied Customers: 4681
Experience:  Ase Master 20+ Years Experience Foreign and Domestic
Type Your Car Question Here...
Paul M ASE Master is online now
A new question is answered every 9 seconds

2000 malibu 3.1, p0134, not reading 02 sensors

Customer Question

2000 malibu 3.1, p0134, not reading 02 sensors
Submitted: 1 year ago.
Category: Car
Expert:  Paul M ASE Master replied 1 year ago.

Hello and thank you for using Just Answer

I'm Paul and I will help you with your Question

 

you need to check the wiring to the PCM

 

I am attaching test information

click here to view

Remember to rate my answer positive so I get credit for my help.

 

If you need more help just log in to the site and reply the question will remain for follow up.

 

 

Paul
Customer: replied 1 year ago.

in tan wire there is no difference if grounded or not scanner reads 450mv, I already checked resistence of those 2 wires to pcm. no open or shorted to ground


 


both o2 sensors are new, map, ect and iat too.

Expert:  Paul M ASE Master replied 1 year ago.

if there is no Change and the wires test good the PCM is bad.

are you looking at these values on a scan tool?

 

I would make sure it acts the same after at operating temperature I have seen some PCM's show a set value until the engine is warm

 

if it is stuck even after a full warm up and while running the above testing and the wires test good the PCM is bad

Paul

Customer: replied 1 year ago.

yes, mt2500 It does it even warm up, no change.


 


and that set value, is there any chance that the pcm show it if any other sensor is bad?,


 


also i think for the same reason its not going into closed loop even when temperature 225 F it show 'OPEN FTL"


 

Expert:  Paul M ASE Master replied 1 year ago.

if the coolant temp is reading ok and there are no other codes

 

I would suspect there is no reason it wouldn't go into closed loop

 

I am attaching the testing procedures in a couple different formats to see if they might help.

I would be suspecting a bad PCM if wiring tested good and values of Coolant temp looks ok.

click here for troublshooting p0134

 

click here for another troubleshooter p0134


Paul

Expert:  Paul M ASE Master replied 1 year ago.
Hi Jose

I'm just following up with you to see how everything worked out?


Please remember to rate my answer positive so I get credit for my help

Paul
Customer: replied 1 year ago.

sorry, I still waiting for ecm to arrive, anytime during this week.

Customer: replied 1 year ago.

i replaced the pcm and now the car doesn't start, its programmed already,


 


antitheft light keeps flashing, already tried leaving key on for 10 mins until light turns off after trying to start.

Expert:  Paul M ASE Master replied 1 year ago.

You have to do the 10-12 minute procedure

 

3 times and then try to start.

once the antitheft light goes out turn key off and repeat 2 more times after the 3rd time the light goes out attempt to start

Keep a charges on the battery when doing this

Paul

Customer: replied 1 year ago.

after the ligh goes out the first time, the second time stays on the whole time i have been there for 20 min and does not go out.i even tried to do the whole thing with the door open or closed and even removing the key each time and the same.

Expert:  Paul M ASE Master replied 1 year ago.

the doors should be closed

after it goes out the first time you should be turning off the key for a couple seconds

 

then when attempting the second time you need to hold the key to the crank position for a second and release to run position.

it should be going out 3 times to complete the relearn

let me know if these steps help

 

Paul

Customer: replied 1 year ago.

it did start like u guided me.


 


now its still in open loop the whole time and its not reading 02'sensor even warmed up

Expert:  Paul M ASE Master replied 1 year ago.

Jose

 

did you get it figured out?

it's possible you are getting a bad reading from the scan tool are there fault codes setting now?

did you run through the testing again?

Paul

Customer: replied 1 year ago.

there are no codes, runs good 700 rpm,


 


the tp sensor its a .60 mv, and temp sensor reading 210, map 40,


 


no resistance in ect sensor from ecm, and since they share ground from ecm with map its good with them disconnected, I am about to replace tp from a junkyard and see if it changes anything since its supposed to read .40mv and maybe after closed loop reads o2 sensors,


 

Expert:  Paul M ASE Master replied 1 year ago.

I have seen situations where scan tools were giving bad readings also

 

is it showing the open loop status?

the TP reading .6 should not be a problem

 

Paul

Customer: replied 1 year ago.
I have tried two diferent ones, and keep reading the same

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
  • The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time! Paul M Corpus Christi, TX
 
 
 

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