AiM MXL - Manual (Page 12)

MXL
User manual
Release 1.24
• Connect the interface black cable – labelled “GND” – to the vehicle chassis
earth (refer to GND paragraph of this user manual for further information).
• Connect the adapter cable labelled “RPM-ECU 4-50 V” to the RPM signal out
coming from the ECU.
The images here below show a not square RPM signal on the left and a filtered one
on the right.
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2.4.4 – Sampling the RPM from the coil: low voltage RPM input
To sample the RPM signal from the coil on a low voltage input (from 150 to 400 V),
connect:
• cable labelled “RPM” (MXL Strada/Pista) to the ECU RPM output that
manages the coil;
• cable labelled “RPM 150-450V” (MXL Pro05) to the ECU RPM output that
manages the coil.
In case the vehicle is not equipped with an ECU take the signal directly from
the low tension coil control of the coil.
MXL may not sample correctly the coil signal because this looks unstable. To filter
the signal use an “RPM coil-ECU” adapter (optional shown here below). It is a double
purpose filter that allows to sample the RPM from the coil and squares the signal
wave form.
• connect the blue adaptor cable labelled “RPM form” to the cable labelled
“RPM” of MXL Strada/Pista wiring.
• connect the blue adapter cable, labelled “RPM form” to the blue cable labelled
“RPM 8-50V” of MXL Pro05 wiring – pin 12 of 37 pins Deutsch type connector.
• connect the red interface cable labelled “V battery” to the positive pole of the
vehicle battery. It is suggested to connect the red cable downstream the
vehicle master switch.
• connect the black interface cable – labelled GND – to the chassis earth of the
vehicle wiring (see GND paragraph of this user manual for further information).
• connect the adapter cable labelled “RPM-Coil 150-400 V” to the coil control.
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