Tach signal wire
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From: Lorton, VA
Tach signal wire
should the tach signal wire's voltage change as the engine speed varies? i'm having a problem with my tach not working like it should. i checked the voltage at the tach signal wire (at the driver's side harness, light blue wire) and it stays constant around 12-13 volts even when the engine speed changes.
Honda-Tech Member
Joined: Oct 2002
Posts: 5,152
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From: chicago burbs, Il, USA
tach signal is a waveform not a voltage.
all though checking it with a volt meter should appear like the voltage changes with RPM.
I don't think the tach line should ever have 12V on it...
all though checking it with a volt meter should appear like the voltage changes with RPM.
I don't think the tach line should ever have 12V on it...
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