MALFUNCTION INDICATOR LIGHT
Caution- Notice to Builder/Installer This engine requires use of a MIL. A MIL
(Malfunction Indicator Lamp) must be installed with this engine to be in compliance with EPA
and CARB regulations.
There are two lights on the dash to indicate engine related problems. The operator is
responsible to acknowledge any illuminated check engine or check gauges lights during the
course of engine operation.
The first indicator is the Check Engine Light. The MIL conveys to the operator that a fault exists
that is related to the engine’s control system. When this light is illuminated a fault code has
been set that requires immediate attention or engine component damage could conceivably
occur.
Please stop operation of engine as soon as safely possible. Request that a technician inspect
the fault code setting, he or she will connect a scan tool to determine the cause of the MIL
illuminating, repair the problem and clear the codes. The MIL related codes are caused by
sensor output and/or conditions that adversely affect the operational output of the engine. Some
of the components that can cause problems are: crank sensor, cam sensor, fuel injectors, fuel
pressure regulators, ignition system and Manifold Air Pressure (MAP) sensor or low fuel
pressure.
NOTE: If the Check Engine light is illuminated, it will remain on until the problem is corrected
and the engine has gone through three consecutive warm up cycles, or if the light has been
cleared by a service technician with a scan tool. A warm up cycle is a starting temperature close
to ambient increasing to normal operating temperature.
The second indicator is the Check Gauges light. This bulb will illuminate when a non-emissions
related issue occurs. Items that can cause these codes are high or low oil pressure and coolant
temperature and various power relay operation, system voltage etc. The lighting of this fault
indicator would indicate to the operator that the gauges for oil pressure and coolant temperature
should be checked immediately and action taken to eliminate engine damage. There are
safeties in the calibration that will reduce engine speed if the sensor output is out of the normal
range (low oil pressure when the engine is at rated speed for instance). If the engine should
turn off for no apparent reason check this lamp. This light will clear on it’s own if the fault clears
and the ignition switch is turned off then back on. If this light turns off on it’s own, the issue will
stay in memory for 40 warm up cycles or until a technician clears it manually with a scan tool.
NOTE: The lamps will not flash the error codes. To retrieve and reset the error codes a
diagnostic scan tool is required. Some vessel manufacturers are using CAN-BUS displays that
can retrieve the error codes, but cannot clear them. See the vessel manufacturer’s instructions
to retrieve the error codes with their device.
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