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ELECTRONIC FUEL INJECTION INFORMATION - 4
ELECTRONIC FUEL INJECTION SYSTEM
The PCM Engines covered in this manual are equipped
with an Electronic Fuel Injection (EFI) system, which
allows precise control of fuel and spark delivery. The
fuel system components of the EFI system are:
• The electric fuel pumps
• The throttle body assembly
• The fuel injectors
The fuel injection system is controlled by an Electronic
Control Module (ECM). The ECM constantly monitors
information from various sensors on the engine, and
electronically processes the information, in order to
control ignition timing and fuel delivery for optimum
performance and fuel economy. The ECM incorporates
an engine overspeed protection, calibrated to a specific
RPM, to prevent engine damage from over-revving.
The sensors that the ECM monitors are:
• Engine Coolant Temperature (ECT) Sensor
• Throttle Position (TP) Sensor
• Manifold Absolute Pressure (MAP) Sensor
• Knock Sensor (KS) System
• Crankshaft Positioning (CKP) Sensor
• Camshaft Positioning (CMP) Sensor
• Intake Air Temperature (IAT) Sensor
• Throttle Control Position (TCP) Sensor
• Pre-Catalyst Wide Band Oxygen (O
• Post-Catalyst Oxygen (O
• Exhaust Manifold Riser Temp (ERWT) Sensors
If, for any reason, one or more of these sensors or
associated wiring malfunctions, the ECM's built-in self-
diagnostic system sets a trouble code and turns on the
"MIL" Malfunction Indicator Lamp to alert the operator of
a malfunction.
In most cases, when the "MIL" is on, the engine(s) may
lose some performance and/or efficiency, but remain
running adequately. Also, the light may go out or
become intermittent, but a trouble code will be logged for
future diagnosis. (See Engine Alarm System - page 16)
In any case, the operator must obtain service by an
authorized PCM Premier dealer to determine the exact
cause of the malfunction.
ENGINE ALARM SYSTEM
The PCM engine electronic system is programmed to
control the engine alarm system. Your Engine Alarm
System may utilize up to three (3) alarm circuits to warn
you of a potential problem with your engine.
) Sensors
2
) Sensors
2
L510010D-17
The Malfunction Indicator Lamp (MIL) is used for
notification of any emissions-related fault. This is an
amber indicator lamp, that may be labeled 'Service
Soon' or with the ISO icon, to warn the operator of
possible engine problems.
The Check Gauges Lamp (CGL) is used for notification
of any non-emissions-related fault. This is a red
indicator lamp to warn the operator of possible
engine problems such as low oil pressure or an over
temperature condition.
The Buzzer is an audible notification to the operator, that
may be used in conjunction with the MIL and/or CGL.
The alarm circuit has a "self" checking feature
programmed into the system. This feature will light the
"MIL" and "CGL" lamps, and also sound the buzzer for
two short pulses upon initial start-up of the engine.
NOTE: If, during Key ON, engine OFF, either the MIL
or CGL lamps are flashing, this indicates that a stored
trouble code or engine fault is recorded in the ECM.
Refer to your dealer for proper diagnosis.
If the "MIL" or "CGL" lights and the alarm sounds during
operation, observe the instrument panel readings for
the possible source of the malfunction, such as low oil
pressure or excessive engine temperature readings.
Other conditions that may sound the warning buzzer are
a transmission over-temperature warning (if equipped),
exhaust manifold water over-temperature warning , and
for an electronic throttle malfunction.
IMPORTANT: A failure involving the Electronic Throttle
may result in Idle only operation of the engine. The
ISO Icon
operator must obtain service by an authorized PCM
Premier dealer to determine the exact cause of this
malfunction as soon as possible.
In most cases, when the "MIL" or "CGL" lights are on, the
engine may lose some performance and/or efficiency,
but remain running adequately. Also, the lights may go
out or become intermittent, but a trouble code will be
logged for future diagnosis.
In any case, the operator must obtain service by an
authorized PCM Premier dealer to determine the exact
cause of the malfunction.
NOTICE: Some boat builders may install their own
alarm system. It is recommended that the boat owner
check with his or her boat dealer for an explanation of
the particular alarm system upon initial delivery.
15
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