-17-
11. How to connect to the ECU speed and rpm signal
※ Each signal is a square wave (pulse).
[Precautions]
① The Lapcom control unit should be run by 12V external power supply.
② It is necessary to modify the Lapcom control unit to a dedicated ECU circuit.
③ Depending on the vehicle type and specifications, measurement may not be possible
in some cases.
④ If the vehicle has remodelled electrical system or added meters, it may not be able to
correctly take in signals from ECU.
⑤ When contacting us regarding ECU connections, please ready the ECU signal
explanation manual beforehand. We are unable to provide an answer based on the wiring
diagram alone.
[RPM signal]
１． Verify that the RPM signal is being output by the ECU.
If the voltage level of the RPM signal is low, the amplifier pulse lead (our optional
parts) is required.
※ If the RPM display is not stable, try to put resistance of 1-3 kilo ohm. This sometimes
makes the RPM stable.
２． Connect the red wire of the provided ECU RPM signal cable to the ECU RPM signal.
The voltage of the signal should be 4V to 12V.
３． Set the REV position of the control unit.
[Speed signal]
１． Connect the white wire of the provided ECU speed signal cable to the ECU speed
signal.
２． Check the speed pulse number, then calculate and enter the speed pulse length.
<4-wheel vehicle> 1,569.85 / Speed pulse number = Speed pulse length (valid:
100 or higher)
<2-wheel vehicle> 714.29 / Speed pulse number = Speed pulse length (valid: 100
or higher)
※ If the tire size has been changed from the genuine part size, multiply the above speed
pulse length by the tire diameter size increased rate and enter the result. Be aware that
depending on the vehicle, the above standard may not apply.
※ When the speed pulse number is 2 pulses, the use of the speed pulse converter (our
optional parts) is recommended.
※ If the speed pulse length is less than 100, it is possible to modify the control unit to
reduce the speed pulse number to 1/4. Please consult with us.
To Next Page
Loading...