Section 1 - Getting to Know Your Power Package
90-8M0113925 eng DECEMBER 2015 Page 17
Testing the Audio Warning System
1. Turn the key switch to the on position without cranking the engine.
2. Listen for the audio alarm. The alarm will sound if the system is functioning correctly.
Guardian Strategy
The MerCruiser Engine Guardian system reduces the potential for engine damage by restricting engine power when the PCM
detects a potential problem. Below are some examples of what Engine Guardian monitors:
• Oil pressure
• Engine overspeed
• Exhaust manifold temperature
IMPORTANT: Engine Guardian can reduce power anywhere from 100% to idle, depending on the severity of the problem. If
forced to idle, boat speed might not respond to throttle operation.
The PCM stores the fault for diagnostics. For example, if the water inlet becomes partially blocked, Engine Guardian reduces
the available power level of the engine to help prevent damage from decreased water flow to the engine. If the debris passes
through, and full water flow is restored, Engine Guardian restores engine power to normal.
Transmission Guardian Strategy
IMPORTANT: Boat speed could be reduced to idle and may not respond to the throttle.
Transmission Guardian is a MerCruiser DTS feature that protects transmissions from clutch damage. Transmission Guardian
monitors the clutch pack pressure in forward and reverse gears. If the transmission fluid pressure drops below a predetermined
level, Transmission Guardian lowers the engine torque and speed to prevent clutch slippage.
The ECM stores the fault and with this information the technician will be able to rapidly diagnose problems.
To Next Page
Loading...
Need help?
General