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DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
ELECTRONIC SUB-SYSTEMS
5.3 ELECTRONIC CONTROL UNITS
– Printed 603.95.994 – 1 Ed. - Base 05/2015
208224
Figure 14
1. Body builders connector
2. Separation diode REQUIRED
3. Interface responsibility of the designer of the processor
4. Signal processor
The bodybuilder must install a special separation diode so as not to lower the V
ON
voltage.
The designer of the signal processor must ensure an input interface equal to that represented with a max. voltage V
CC
of 5 V and ”pull-up /
pull-down” so as not to lower the voltage V
ON
and to raise the response time set by the vehicle interface.
5.3 ELECTRONIC CONTROL UNITS
Precautions to be used with electronic control units installed
In order to avoid operations that could permanently damage or degrade the functioning of the vehicle ECUs, it is advisable to:
● remember that connection and disconnection from battery terminals may generate voltages that adversely affect vehicle elec-
tronic systems and control units;
● do not disconnect and/or connect connectors from/to the control units with engine running or control units powered;
● detach the electronic control units where particular processing operations involve temperatures above 80ºC;
● absolutely never employ a rapid battery charger for emergency start-up because it could damage the electronic systems, par-
ticularly the control units that manage the ignition and power supply functions;
● do not supply current to components served by electronic modules with jumper cables
● connect the control units equipped with metal casing to the ground of the system using a screw or bolt unless otherwise spe-
cified.
In case of any work on the chassis requiring arc welding:
● disconnect CBA1 from the battery positive terminal and do not connect it to the chassis ground;
● disconnect the control unit connector;
● disconnect the control unit from the chassis (in case of welding near the control unit itself);
● perform welding with continuous current;
● ground the welding machine as close as possible to the welding point;
● do not place the battery cables parallel to the vehicle's electric cables.
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