HYOSUNG 2010 ST7 Service Manual page 110

4-3 EI SYSTEM DIAGNOSIS
● When disconnecting and connecting the ECU, make
sure to turn "OFF" the ignition switch, or electronic
parts may get damaged.
● Battery connection in reverse polarity is strictly pro-
hibited.
Such a wrong connection will damage the compo-
nents of the EI system instantly when reverse power
is applied.
● Removing any battery terminal of a running engine is
strictly prohibited.
The moment such removal is made, damaging
counter electromotive force will be applied to the ECU
which may result in serious damage.
● Before measuring voltage at each terminal, check to
make sure that battery voltage is 11 V or higher.
Terminal voltage check at low battery voltage will
lead to erroneous diagnosis.