TOHATSU 40 Service Manual page 229

SECTION 7
At the same time, an abnormal condition from either sensor
3
also activates the warning horn (6). The CD Unit activates
the horn by sending an output signal to lead (20). Note that the
lower oil level float (16) also causes the lower oil level indicator (18)
in the LCD multi-purpose meter (4) to flash when it detects a low oil
condition.
It is important to note that the if the upper oil level float (15)
3
detects a low oil condition, it activates the upper oil level
indicator (17) in the LCD multi-purpose meter (4) but will not trigger
the RPM limitation feature or the warning horn (6).
An abnormal condition detected by the overheat sensor (5)
3
causes the warning horn to sound and the overheat
indicator (19) in the LCD multi-purpose meter (4) to flash. The RPM
limitation feature is not triggered in this case.
7-50
T1488
3-/ 4-Cylinder