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rpm sensor

Discussion in 'Freightliner Forum' started by james007, Aug 24, 2014.

  1. Aug 24, 2014 #1
    james007

    james007 Bobtail Member

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    Aug 24, 2014
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    Where is the rpm sensor at on the eaton fuller transmission driving rpm drop kicks cruise control and
    jake break off when in using
     
    james007, Aug 24, 2014
    james007, Aug 24, 2014
    #1
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  3. Aug 26, 2014 #2
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Eaton fuller made many models of transmissions, how about a little more info if you want some help. The only RPM that all transmissions have is the vehicle speed sensor in the back of the transmission that reads output RPM. Depending the the year/make/model (which is a mystery), it could also drive your speedo and feed road speed info to the engine/trans. Auto's also have an input RPM sensor too.

    So you're not going to get much help without telling people more info about your truck.
     
    GrapeApe, Aug 26, 2014
    GrapeApe, Aug 26, 2014
    #2
  4. Aug 30, 2014 #3
    james007

    james007 Bobtail Member

    12
    2
    Aug 24, 2014
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    Sorry for the end compete information on this. Century 2008 d60 13 speed. I replace the speed sensor that's 2 wire on the back side transmission is there another one on the transmission for the RPM
     
    james007, Aug 30, 2014
    james007, Aug 30, 2014
    #3
  5. Aug 30, 2014 #4
    j_martell

    j_martell Light Load Member

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    Jun 12, 2014
    Centre Wellington, Ontario
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    Back of the tranny should be road speed ......being as the truck is new , rpm should come from the computer to the gauge
     
    j_martell, Aug 30, 2014
    j_martell, Aug 30, 2014
    #4
    james007 Thanks this.
  7. Aug 31, 2014 #5
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Assuming that it is not an auto trans, the VSS is the only speed sensor in the transmission. Since you only have 1 sensor and it's only 2 wires, that sensor feeds the engine ECM, the engine ECM sends a signal to drive the speedo. Engine RPM also comes from the engine ECM to drive the tachometer. There are 2 sensors in the engine that will provide RPM signal to the ECM, the TRS and SRS (Crank and cam sensors). Check logged fault codes, if you see codes for missing TRS or SRS, you may have a sensor or wiring issue.
     
    GrapeApe, Aug 31, 2014
    GrapeApe, Aug 31, 2014
    #5
    james007 Thanks this.
  8. Aug 31, 2014 #6
    james007

    james007 Bobtail Member

    12
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    Aug 24, 2014
    0
    Replace the cam sensor now time to change out the crank sensor then check the for a bad wire
     
    james007, Aug 31, 2014
    james007, Aug 31, 2014
    #6
  9. Sep 1, 2014 #7
    RSQ20

    RSQ20 Medium Load Member

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    Jul 11, 2013
    Upper Fraser Valley, BC Canada
    0
    I would have thought checking the wiring would have been first...

    Cheaper than sensors...

    ... Philip
     
    RSQ20, Sep 1, 2014
    RSQ20, Sep 1, 2014
    #7
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