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99 Frtliner cruise when turned on sets itelf and accelerates by itself.

Discussion in 'Freightliner Forum' started by Trk529252, Mar 12, 2012.

  1. Mar 12, 2012 #1
    Trk529252

    Trk529252 Bobtail Member

    6
    0
    Mar 12, 2012
    San Antonio, Tx
    0
    My 99 Century cruise control functions normally when parked and I set cruise and idle up RPM's. The problem starts when I'm running, turn cruise on/off switch to on. Cruise will set itself at whatever speed I'm doing and accelerate to its max. Brake disconnect functions, set, pause etc... all seem to work except it seems to have a mind of its own and takes off. Can anyone help? Thanx!
     
    Trk529252, Mar 12, 2012
    Trk529252, Mar 12, 2012
    #1
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  3. Mar 13, 2012 #2
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    disconnect switch first. if problem goes away - change switch, if not - inspect wires, especially in ECM area
     
    Pablo-UA, Mar 13, 2012
    Pablo-UA, Mar 13, 2012
    #2
    123456 Thanks this.
  4. Mar 13, 2012 #3
    Trk529252

    Trk529252 Bobtail Member

    6
    0
    Mar 12, 2012
    San Antonio, Tx
    0
    Thanx fir the input, I"ll try your suggestions and let you know results.
     
    Trk529252, Mar 13, 2012
    Trk529252, Mar 13, 2012
    #3
  5. Mar 15, 2012 #4
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Kinda sounds like a setting in the ecm I work on a fleet of dumps material trucks and mixers on the mixers after you turn the cruise on if you hit accelerate it goes to max rpms for loading its in the ecm settings I've seen a lot of times where the ecm parameters change on there own for somereason its someting to look into
     
    truckmechanic, Mar 15, 2012
    truckmechanic, Mar 15, 2012
    #4
  7. Mar 15, 2012 #5
    Semi Crazy

    Semi Crazy Road Train Member

    3,033
    2,046
    May 13, 2011
    Middle Tennessee
    0
    Sounds like it has the special "Toyota" ECM flash!
     
    Semi Crazy, Mar 15, 2012
    Semi Crazy, Mar 15, 2012
    #5
  8. Mar 15, 2012 #6
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Right on semi crazy
     
    truckmechanic, Mar 15, 2012
    truckmechanic, Mar 15, 2012
    #6
  9. Mar 18, 2012 #7
    Trk529252

    Trk529252 Bobtail Member

    6
    0
    Mar 12, 2012
    San Antonio, Tx
    0
    Checked wires in he ECM area. Protective plastic covering around bundled wires leading to ECM had deteriorated/crumpled letting wires chafe against motor block. Installed replacement covering and cruise control is back to normal.. Thanx again.
     
    Trk529252, Mar 18, 2012
    Trk529252, Mar 18, 2012
    #7
  10. Mar 18, 2012 #8
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    insolate wires with hight quality electric band, else corrosion will destroy them this spring. and better change wiring with connectors. it is availble in shops.
     
    Pablo-UA, Mar 18, 2012
    Pablo-UA, Mar 18, 2012
    #8
  11. Sep 27, 2012 #9
    55_cans

    55_cans Light Load Member

    98
    19
    Sep 14, 2012
    Alberta
    0
    lol, that's good.
     
    55_cans, Sep 27, 2012
    55_cans, Sep 27, 2012
    #9
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