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    johnwfranks's Avatar
    johnwfranks Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Oct 3, 2013, 03:44 PM
    Tachometer jumps or doesn't work
    1990 Honda Civic Wagon 1.5
    The Tachometer jumps or works fine or doesn't work.
    There is no code showing.
    What could this indicate?
    odinn7's Avatar
    odinn7 Posts: 7,691, Reputation: 1547
    Entomology Expert
    		  
    #2

    Oct 3, 2013, 03:46 PM
    The tach is bad, a connection is bad, or maybe the sending unit is bad.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #3

    Oct 4, 2013, 05:43 AM
    It's possible the Ignition Control Module (ICM) is failing. The BLU wire from the ICM goes to the tachometer. An erratic tachometer is often a sign that the ICM is bad.
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