Crimestopper Security Products RS701 III - Manual (Page 6)

TACH WIRE TROUBLESHOOTING
If all remote start wiring has been completed, attempt a remote start. If engine starts, and starter disengages
quickly, and engine continues to run, the tach wire has been properly connected.
** If system does not remote start properly, you will have to locate a different tach wire and reprogram.
AN INADEQUATE TACH SOURCE WILL PRESENT ANY VARIETY OF THE FOLLOWING PROBLEMS:
•
Starter stays engaged after engine starts.
•
Starter releases properly when engine starts, but engine then stalls BEFORE the time out. System may re-start.
•
Starter releases properly, and engine runs, but then starter re-engages. (This makes a terrible grinding noise
and the system must be shut off as quickly as possible to prevent damage to starter and flywheel). See "Tach
Amplifier" below and on next page for other alternatives in solving starting problems!
TACH AMPLIFIER
The Tach Amplifier feature is capable of detecting engine speed inductively (not connected directly but rather placed
next to) from a spark plug wire or other source. This Tach Amp also has the ability of picking up very low voltage
signals (as low as 1 volt) from vehicle computer modules, which more and more are driving the Tachometers in
newer vehicles. In addition to the ability to detect signals inductively, the tach amplifier also conditions and
smoothes the signal to prevent spiking and glitches from influencing the Remote Start processor. Tach amp is
turned on or off by a jumper plug on the unit next to the harness connectors. The unit is shipped with the tach amp
off. Tach amp should be used only in cases where an acceptable factory tach wire cannot be easily located. SEE
DIAGRAM.
+ -
COIL
TACH AMPLIFIER
JUMPER PINS
TACH WIRE CAN BE PLACED NEXT TO OR WRAPPED
AROUND THE MAIN COIL WIRE OR ANY SPARK PLUG
WIRE. SEE BELOW FOR SAMPLES.
THERE IS NO GUARANTEE THAT THIS TYPE OF TACH
SENSING WILL WORK. HOWEVER, IT PROVIDES
ANOTHER POSSIBILITY.
JUMPER PLUG
CONNECTION
ATTACH WIRE USING HI-TEMP PLASTIC CLAMPS
OR WIRE TIES.
COIL OR SPARK PLUG WIRE
RED/WHITE WIRE
TACH TACH
AMP AMP
ON OFF
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