Service Manual

Multi Pro 5700--DPage 7.1 -- 24Sonic Boom System (Optional Kit)

Electronic Control Unit (ECU)

The Sonic Boom System uses an electronic control unit

(ECU) to control electrical system operation. The ECU

is attached to a mounting plate under the vehicle dash

panel (Fig. 12).

Power is provided to the ECU when the vehicle ignition

switchisON.A5 amp fuse provides circuit protectionfor

this logic power to the ECU. The fuse is located in the

Sonic Boom System fuse block.

The ECU monitors the states of the following compo-

nentsasinputs:thesonic modeswitch,thetwo (2)boom

actuator switches and the two (2) boom sonic sensors.

The ECU controls electrical output to the sonic boom

light and the six (6) relays that are part of the Sonic

Boom System. Circuit protection for the ECU outputs is

provided by a 10 amp fuse located in the Sonic Boom

System fuse block.

Because of the solid state circuitry built into the ECU,

there is no method to test it directly. The ECU may be

damagedifan attempt is madeto test it with anelectrical

test device (e.g. digital multimeter or test light).

IMPORTANT: Before performing welding on the ma-

chine, disconnect both cables from the battery and

disconnect wire harness connector from the ECU.

These steps will prevent damage to the machine

electrical system.

1. Mount plate

2. Electronic control unit

3. Sonic boom fuse block

4. Relay (6 used)

Figure 12