Question about 2004 Hyundai Santa Fe

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Tachometer stopped working completely but all other gauges are fine. Tachometer would work off and on for a few days before completely not working. "Check engine light" stays on. All fuses are fine. This all began after I jumpstarted someone's vehicle a week ago.

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It's very UNLIKELY the jumpstart had anything to do with it, unless you accidentally connected the battery in 'reverse polarity', which causes the electrical system voltages to 'DROP' instantaneously to near zero volts and create 'current spiking' in all active circuits. Nevertheless, the microcomp in the instrument cluster which drives the TACH has protective curcuits. The only solutions are to eliminate any problems in the wiring between the ECM/PCM and the instrument cluster, and bench test the tach to determine if it's working properly. Process of elimination - if wiring is ok and the Tach is ok, then the problem is in the ECM/PCM.




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Posted on Sep 07, 2009

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