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94 freightliner FLB tach

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Oakcityarms, Aug 6, 2019.

Page 2 of 2
  1. Aug 19, 2019 #11
    Oakcityarms

    Oakcityarms Bobtail Member

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    Aug 6, 2019
    Oklahoma city
    0
    There is no sensor in the flywheel unfortunately. The dealer claims its in the transmission tail shaft and some say it reads from the ecm but its a DDEC2 ecm and shouldnt. Some also say its a lead wire on the alt.

    However, when a scanner is plugged in the ECM is reading the rpm just fine. So it could be a signal from ecm. I need to find someone with experience with a DDEC2 system. This is driving me nuts.
     
    Oakcityarms, Aug 19, 2019
    Oakcityarms, Aug 19, 2019
    #11
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  3. Aug 19, 2019 #12
    Bean Jr.

    Bean Jr. Road Train Member

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    I love it when the dealer is so wrong! What you need to do is go ask at Detroit shop, not Freightliner. They simply aren't knowledgeable enough regarding older engines. Even at Detroit there will probably be only one or two mechanics who are familiar with DDEC2.

    Where are you, btw? If you are in Chicago area, Interstate Power Services in Carol Stream is knowledgeable, but in Cedar Rapids there is only one guy who knows what is going on with a ddec2, and even his memory is a little rusty.
     
    Bean Jr., Aug 19, 2019
    Bean Jr., Aug 19, 2019
    #12
  4. Aug 19, 2019 #14
    Oakcityarms

    Oakcityarms Bobtail Member

    32
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    Aug 6, 2019
    Oklahoma city
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    Im in Oklahoma city. The o ly detroit shop around us is the freightliner dealer.
     
    Oakcityarms, Aug 19, 2019
    Oakcityarms, Aug 19, 2019
    #14
    Bean Jr. Thanks this.
  5. Aug 19, 2019 #14
    Oakcityarms

    Oakcityarms Bobtail Member

    32
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    Aug 6, 2019
    Oklahoma city
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    Actually i just looked and there is a different Detroit engine shop in okc. Ill call them tomorrow
     
    Oakcityarms, Aug 19, 2019
    Oakcityarms, Aug 19, 2019
    #14
    Bean Jr. Thanks this.
  7. Aug 20, 2019 #15
    Dino soar

    Dino soar Road Train Member

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    On the back of the gauge there should be a positive and negative and a signal wire.

    I would think if you take the gauge out you would be able to check the signal wire to see if it increases with engine RPMs. You can test ground and the power wire also to see if they are functioning correctly and nothing came loose or any other problems.

    You should be able to isolate the problem that way.
     
    Dino soar, Aug 20, 2019
    Dino soar, Aug 20, 2019
    #15
  8. Aug 20, 2019 #17
    Oakcityarms

    Oakcityarms Bobtail Member

    32
    15
    Aug 6, 2019
    Oklahoma city
    0
    On the guage its electronic. It has 6 wires going to it and a set of dip switches. I did find a diagram of the guage pins so i can test that this morning
     
    Oakcityarms, Aug 20, 2019
    Oakcityarms, Aug 20, 2019
    #17
    Bean Jr. Thanks this.
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