Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Jake Brakes

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by madmantrapper, Mar 26, 2020.

  1. Mar 26, 2020 #1
    madmantrapper

    madmantrapper Bobtail Member

    2
    0
    Mar 26, 2020
    0
    I am very new to diesel mechanics. I understand how a Jake works but don't understand the circuitry. All I can find online are diagrams showing the clutch switch, dash switches and fuel pump switch. I am looking at a 1999 Volvo with a M11 Cummings. I know the clutch switch is good (checked with an ohm meter) and I have 5 volts across the open leads wires coming to it with the switch removed. If I am understanding this correctly, current flows from the battery to the clutch switch to the dash switches and the fuel pump switch. As long as all these situations are satisfied, the solenoids for the exhaust valves will activate. Is this correct?
     
    madmantrapper, Mar 26, 2020
    madmantrapper, Mar 26, 2020
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Mar 26, 2020 #2
    AModelCat

    AModelCat Road Train Member

    27,729
    145,300
    Jul 7, 2015
    Canuckistan
    0
    Should all go through the ECM. Voltage signal out, voltage signal back on a different pin.
     
    AModelCat, Mar 26, 2020
    AModelCat, Mar 26, 2020
    #2
  4. Mar 26, 2020 #3
    Dino soar

    Dino soar Road Train Member

    4,589
    21,825
    Dec 8, 2017
    0
    l
    I do not remember the order of the circuitry but that sounds correct- for a mechanical engine.

    For an electronic engine,. It is all electronic computer nonsense...
     
    Dino soar, Mar 26, 2020
    Dino soar, Mar 26, 2020
    #3
  5. Mar 27, 2020 #4
    madmantrapper

    madmantrapper Bobtail Member

    2
    0
    Mar 26, 2020
    0
    If it is an electronic system, 5 volts would seem correct, I think. If it were mechanical, it would seem to be more like 12 volts. Does that make sense?
     
    madmantrapper, Mar 27, 2020
    madmantrapper, Mar 27, 2020
    #4
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.