TACH PROGRAMMING & TACH SIGNALS
INTRODUCTION
Tach signals will vary in levels and frequencies depending on many factors including the type of vehicle and the source
of the signal. The signals from a vehicle’s injector wire and coil pac wire can vary greatly even on the same engine. The
tach signal from an engine can also affected by other sources such as electronic noise from the ignition or computer
modules.
TACH MODE
The Tach mode provides reliable remote starting performance though engine speed (RPM) sensing. When using Tach
Reference Mode, the Red/White wire is used for Tach signal [Engine RPM] input. Most modern engines include various
points where the Engine Speed [Tach] or A/C signal may be obtained. Tach Signal examples: Negative (-) side of
ignition coil, at the Distributor or Ignition Control Module, Coil Pack, Engine Computer, or Crankshaft Sensor.
Sometimes Fuel injectors, and Alternator stator pins can be used.
These Tach Signal locations mentioned are provided
as a guide, your vehicle may differ. Some locations will NOT be a good location for Tach source due to RF noise or
Computer Data.
TACH PROGRAMMING: (ENGINE MUST BE RUNNING TO PROGRAM A TACH SOURCE)
1. Open hood (or ground Gray hood pin wire if no hood pin is installed.)
2. Red/White wire should be connected to a valid Tach source.
3. Start engine with key.
4. Press program button 5 times, then wait for 5 light flashes.
5. Push program button again once. (You must get one light flash after button is pressed.) This unit is now at
option #1-Tach Learning.
6. Press the #1 Lock Button on the remote. (ON EZ-10 MODELS: Press the brake pedal once). The unit will read
the Tach source and flash the lights once for program confirmation.
7. If lights do not flash for confirmation, then try another tach source or try the tach finder to locate another wire.
EXAMINING THE TACH FREQUENCY WITH A DIGITAL MULTI-METER (Hz Setting)
If you own a Digital Multi-Meter meter with a frequency counter setting, it can be helpful to measure and research the
range of tach signal from your particular engine. When probing your chosen tach wire, observe the frequency reading
from the meter at both the warm/low engine idle and cold/high engine idle points. Tach signals ranging between 70Hz
and 700Hz are desired. If your tach wire has readings that are not in this range, the unit may not operate properly. The
frequency of the tach wire in this range does not guarantee operation. If you cannot locate a good tach source from your
engine, then you can switch your EZEE Start system to the “Smart Tachless” mode.
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