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finding the tachometer wire
To test for a tachometer wire, a multimeter capable of testing AC
voltage must be used. The tachometer wire will show between
1V and 6V AC. In multi-coil ignition systems, the system can
learn individual coil wires. Individual coil wires in a multi-coil
ignition system will register lower amounts of AC voltage. Also,
if necessary, the system can use a fuel injector control wire for
engine speed sensing.
Common locations for a tachometer wire are the ignition coil,
instrument cluster, fuel injectors, or engine computers.
Use the following procedure to locate the tachometer wire with
your multimeter.
1. Set the multimeter to ACV or AC voltage and a range of 12V or 20V.
2. Attach the (-) probe of the meter to chassis ground.
3. Start the engine.
4. Probe the wire you suspect of being the tachometer wire with the
red probe of the meter.
© 2004 Directed Electronics, Inc.
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