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2003 century tachometer problems

Discussion in 'Freightliner Forum' started by biggun, Mar 31, 2014.

  1. Mar 31, 2014 #1
    biggun

    biggun Bobtail Member

    36
    5
    Jan 24, 2014
    broomfield, co
    0
    Can anyone guide me where to start on this issue. At first the tech was "lagging" and wouldn't really catch up to engine speed unless held at a certain speed. But only when driving. When ideling it worked fine if you revved it up. Now its just stuck on 1500. All other gauges work fine including Speedo.
     
    biggun, Mar 31, 2014
    biggun, Mar 31, 2014
    #1
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  3. Mar 31, 2014 #2
    biggun

    biggun Bobtail Member

    36
    5
    Jan 24, 2014
    broomfield, co
    0
    Also the front of the ecm where all the plugs go into it is caked with grease and oil. What can I use to clean the connections with and is it ok to unplug them one at a time to clean.
     
    biggun, Mar 31, 2014
    biggun, Mar 31, 2014
    #2
  4. Mar 31, 2014 #3
    wonderdog24

    wonderdog24 Medium Load Member

    377
    127
    Mar 1, 2012
    Puyallup,Wa
    0
    Vehicle speed sensor.... Sits on top/side of tranny.... Ez fix 100.00 part
     
    wonderdog24, Mar 31, 2014
    wonderdog24, Mar 31, 2014
    #3
  5. Apr 1, 2014 #4
    biggun

    biggun Bobtail Member

    36
    5
    Jan 24, 2014
    broomfield, co
    0
    But the Speedo works perfect
     
    biggun, Apr 1, 2014
    biggun, Apr 1, 2014
    #4
  7. Apr 1, 2014 #5
    wonderdog24

    wonderdog24 Medium Load Member

    377
    127
    Mar 1, 2012
    Puyallup,Wa
    0
    Nothing else involved... Tach gets it signal from vehicle speed sensor.... if tach was broke it wouldn't move at all.... Sensor is 11 years old.... You could buy another tach... 100-150.00....
     
    wonderdog24, Apr 1, 2014
    wonderdog24, Apr 1, 2014
    #5
  8. Apr 1, 2014 #6
    bad-luck

    bad-luck Road Train Member

    3,429
    6,317
    Nov 16, 2013
    Baltimore, Maryland
    0
    Do you have a Qualcomm? If so see if the it is reading rpms. If you dont have one have it put on a computer to see if it is reading rpms. If either one is reading rpms then the rpm sensor on the trans is working and it is the tac or a wire problem. If they are not reading rpms them start with the rpm sensor. as for cleaning the plug crc makes electrical cleaner
     
    bad-luck, Apr 1, 2014
    bad-luck, Apr 1, 2014
    #6
  9. Apr 1, 2014 #7
    biggun

    biggun Bobtail Member

    36
    5
    Jan 24, 2014
    broomfield, co
    0
    No Qualcomm. So is the tach sensor and speed sensor the same
     
    biggun, Apr 1, 2014
    biggun, Apr 1, 2014
    #7
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