fh12 won't start - wiring and ECM issues

Discussion in 'Volvo Forum' started by preman, Oct 1, 2012.

  1. Cobra67y20

    Cobra67y20 Medium Load Member

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    Jul 24, 2012
    Oviedo, Fl
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    Preman:
    PM Pablo-UA see if he can help you.
     
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  3. preman

    preman Bobtail Member

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    Sep 27, 2012
    francistown , botswana
    0
    still waiting for the right answer on my fh12 not starting its a 24v system d12a engine british assembled cranking but not starting no ecm lights coming on .which are the wires carrying ignition and ground to the ecm.is the vehicle fitted with an ecm protector and where is it located its a 95 model
     
  4. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    first of all, '95 FH 12 had no protection unit on European market. On US market there was relay that disabled ECM power supply.

    weak points of early FH12 were wiring under cab (dr side), ecm power supply relay (when relay ore fuse fails no CEL) and ECM (it is easy to damage with pressurized fuel, like aftermarket fuel priming pump, compressed air in fuel tank).

    No I wanna add some usefull info View attachment Fault Code.pdf View attachment TSP21578-Wiring Diagram FH12, FH16 (ENG).pdf
     
    Cobra67y20 Thanks this.
  5. Cobra67y20

    Cobra67y20 Medium Load Member

    317
    139
    Jul 24, 2012
    Oviedo, Fl
    0
    Hey Pablo,thanks for helping this guy out in Africa, it's nice to know unselfish folks like you are willing to help.
     
  6. preman

    preman Bobtail Member

    10
    0
    Sep 27, 2012
    francistown , botswana
    0
    pablo u are a star thanx
     
  7. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    is the truck fixed?
     
  8. preman

    preman Bobtail Member

    10
    0
    Sep 27, 2012
    francistown , botswana
    0
    almost ecm faulty waiting for another one
     
  9. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    how was ecm damaged? aftermarket prime pump installed not on engine?
     
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