Warning System Signals - Mercury 150 EFI Service Manual

WIRING DIAGRAMS

Warning System Signals

NOTE: The warning system signals which includes audible and visual indicator involving
the horn and gauges will identify the potential problems listed in the chart
Problem
Power Up/System Check
Low Oil
Oil Pump Electrical
Failure
Over Heat
Water In Fuel
Over Speed
Coolant Sensor Failure
MAP Sensor Failure
Air Temperature Sensor Fail-
ure
Ignition Coil Failure
Injector Failure
Horn Failure
Battery Voltage too high
(16V) or too low (11V) or
very low (9.5V)
Throttle Sensor Failure
Block Water Pressure
Calculated Oil Level Critical
Page 2D-18
Horn Monitor Display
Single Yes
Beep
4 Beep... 2 Yes
Minutes Off
Yes
Continuous Yes
Beep
4 Beep... 2 Yes
Minutes Off
Continuous Yes
Beep
No Yes
No Yes
No Yes
No Yes
No Yes
N/A Yes
No Yes
Continuous Yes
Intermittant
Beeping
Yes Yes
Yes Yes
Guardian Acti- Engine Speed
vated Reduction Activated
N/A
No
Yes
(See Guardian System)
Yes
(See Guardian System)
No
Yes
(See Guardian System)
No
No
No
No
No
Yes
(See Guardian System)
Yes
(See Guardian System)
Yes
(See Guardian System)
Yes
90-883728 JULY 2001
No
No
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
Yes
Yes