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 DirectInjection Your Own Question

DirectInjection
DirectInjection, Mechanic
Category: Heavy Equipment
Satisfied Customers: 95
Experience:  14 years experience. Certified Mercedes-Benz, Ford, Caterpillar, Allison Transmissions, Freightliner
63301024
Type Your Heavy Equipment Question Here...
DirectInjection is online now
A new question is answered every 9 seconds

Got this code 128 230 06 TPS Idle Validation Switch Short to

Resolved Question:

Got this code 128 230 06 TPS Idle Validation Switch Short to Ground, change the switch didn't help what's next
Submitted: 1 year ago.
Category: Heavy Equipment
Expert:  DirectInjection replied 1 year ago.
Hello. I believe I can help you here. First off by changing the switch you mean you changed the entire throttle pedal assembly, correct?
DirectInjection, Mechanic
Category: Heavy Equipment
Satisfied Customers: 95
Experience: 14 years experience. Certified Mercedes-Benz, Ford, Caterpillar, Allison Transmissions, Freightliner
DirectInjection and other Heavy Equipment Specialists are ready to help you
Customer: replied 1 year ago.

No just switch that attach to pedal, the code reefers to TP Sensor Idle Validation Switch.


Should I try to change hole assembly?

Expert:  DirectInjection replied 1 year ago.
Can you give me the last 6 of the VIN#?

Yes you normally have to replace the entire pedal assembly. The idle validation circuit actually consist of two switches. One is built into the pedal assembly it's self.
Customer: replied 1 year ago.

W04326 I inspected the pedal it looks good, it does turn the switch. My truck just idles, and ones I push the pedal it throws the code.

Expert:  DirectInjection replied 1 year ago.
Okay just give me a couple minutes to look up your particular wiring schematic with your VIN#.
Customer: replied 1 year ago.

No problem

Expert:  DirectInjection replied 1 year ago.

Was the new sensor you installed Part# XXXXX 131973? That is the particular one your truck calls for. Unfortunately you need to be able to see what we call "TPS Counts" in order to trouble shoot the problem which requires a laptop and diagnostic software. How ever there are a few things you can do to attempt to fix the issue. You should 3 wires at the throttle pedal sensor. D952, D916, and D417. These go to the firewall wall connector and into the engine compartment. D952 goes to pin #18 on the firewall connector. D916 goes to pin #8 on same conn. D417 goes to pin #9 on same conn. Once you get in the engine compartment these wires go from the same connector (engine compartment side) down to the engine ECM. D952 goes from the firewall connector pin #18 to Engine ECM connector pin #G1 D916 goes from pin #8 of the firewall connector to engine ECM connector pin #A3 D417 goes from firewall connector pin #9 to engine ECM connector pin #D2 There are two engine ECM connectors. The one you need to disconnect is the rear most one that is closest to the cab of the truck. I would use a multi meter and ohm out these wires from pin to pin and see if any of them are broken or if any of them are showing to be ground while both the engine ecm connector and the throttle pedal is disconnected. If one is found broken or showing ground to the truck even though everything is disconnected then you need to replace or repair that particular wire. If all wiring shows to be good and you are sure it is not a defective new TPS sensor then the only thing left is a bad engine ECM throwing a false code.

 

switchv

Customer: replied 1 year ago.

The new sensor par t# XXXXX XXXXX is it good?


Does my truck have another sensor pedal assy.?


Does it make any sense to change throttle pedal before troubleshooting?

Expert:  DirectInjection replied 1 year ago.
That is the part number shown for your truck. It is likely that the part number now superceeds to another part#. Any parts person at any freightliner dealership if you call them can run that part # XXXXX gave you and tell you if it is the newest one or not. The one I gave you is the correct one tho. We just need to make sure you were sold the right sensor. I would just verify you received the correct part before check the wires.
DirectInjection, Mechanic
Category: Heavy Equipment
Satisfied Customers: 95
Experience: 14 years experience. Certified Mercedes-Benz, Ford, Caterpillar, Allison Transmissions, Freightliner
DirectInjection and other Heavy Equipment Specialists are ready to help you

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
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    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:

    112
    16 years of experience
  • http://ww2.justanswer.com/uploads/Boxerman1969/2009-06-22_213107_ja_avatar.JPG Tim's Avatar

    Tim

    Foreman

    Satisfied Customers:

    338
    23 Years Heavy Equipment and Truck Repairs Shop and Field in the Minning and Construction Industry
  • http://ww2.justanswer.com/uploads/jrwhitey2000/2009-01-03_193237_me.jpg J.R.'s Avatar

    J.R.

    Technician

    Satisfied Customers:

    148
    13 years as warranty technician for Detroit Diesel
  • http://ww2.justanswer.com/uploads/yellowman99/2010-03-20_033822_Marshall_Pete_Furr.jpg Cat Man's Avatar

    Cat Man

    Caterpillar Engine Expert

    Satisfied Customers:

    3714
    23 Years Caterpillar Engine experience.
  • http://ww2.justanswer.com/uploads/WT/wtolkson/2012-6-8_12723_JApicture2012.64x64.jpg Wayne's Avatar

    Wayne

    Journeyman

    Satisfied Customers:

    3023
    34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
  • http://ww2.justanswer.com/uploads/cumminsdr/2010-7-20_204410_ja.jpg DR.Cummins's Avatar

    DR.Cummins

    FIELD SERVICE TECHNICIAN

    Satisfied Customers:

    2354
    16 Years working on Cummins Diesel engines,
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    service manager

    Satisfied Customers:

    2229
    30 years exp. with diesel engines, heavy equipment and forklifts, including lp forklifts
 
 
 
Chat Now With A Technician
DirectInjection
DirectInjection
Technician
95 Satisfied Customers
14 years experience. Certified Mercedes-Benz, Ford, Caterpillar, Allison Transmissions, Freightliner