Aim EVO4 User Manual download pdf (Page 12)

CHAPTER 5 THE RPM CHANNEL

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The RPM Channel.

EVO4 can get the RPM signal in many

different ways:

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From ECU

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Through a square wave signal (8 to 50 V)

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From the low voltage (from 150 to 400 V)

of the coil.

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From the spark plug by converting the

inductive RPM signal read from the spark

plug into a square wave signal.

In this case you must use an optional

RPM adapter Code X10ADRPM000.

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How to read RPM from ECU

To get RPM from the ECU, connect EVO4,

configure it as shown in the previous para-

graph and enable RPM acquisition from

ECU.

In this case, RPM is of course just one of the

many data flowing from your ECU to EVO4.

EVO 4

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Acquiring the RPM via a 5-50 V square

wave signal or coil (150-400 V)

In case your engine is not managed by any

ECU, EVO4 can read the signal from the low

voltage of the coil (whose peak can be from

150 to 400 V) or from a possible square

wave (the peak can be from 5 at 50V.)

The connector labeled "rpm / K", reported

in Figure 13, receives the signals:

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Low coil voltage 150-400 V on Pin 1

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4-50 V square wave on pin 3

The connection cable is in the kit and its

code is 04.563.02.

You will find the technical drawing in the

Appendix.

The following image shows an example of

wiring for the ignition system. The output

cable, labeled gray tach, which can be ac-

quired directly from EVO4 through the 5-50

volts. input, is shown here:

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

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