4.29
ELECTRONIC FUEL INJECTION
4
FUEL LINES
Quick Connect Removal / Installation
RANGER 500 EFI models use quick connect fuel lines. Refer
to the steps for fuel line removal / installation:
1. Thoroughly clean the connector. Place a shop towel
around the fuel line to catch any dripping fuel. Squeeze the
connector tabs together and slide the retainer forward
2. Pull out on the fuel line for removal.
3. To install the line, verify the connector and nipple are clean
and free of debris.
4. Place the connector end over the fuel line nipple and push
the retainer and tabs back into place.
ELECTRONIC CONTROL MODULE
(ECM)
Operation Overview
The ECM is the brain or central processing computer of the
entire EFI fuel / ignition management system. During operation,
sensors continuously gather data which is relayed through the
wiring harness to input circuits within the ECM. Signals to the
ECM include: ignition (on/off), crankshaft position and speed
(RPM), throttle position, engine coolant temperature, air
temperature, intake manifold air pressure and battery voltage.
The ECM compares the input signals to the programmed maps
in its memory and determines the appropriate fuel and spark
requirements for the immediate operating conditions. The ECM
then sends output signals to set the injector duration and ignition
timing.
During operation, the ECM continually performs a diagnostic
check of itself, each of the sensors, and system performance. If
a fault is detected, the ECM turns on the Malfunction Indicator
Light (MIL) (Check Engine Light) on the speedometer and
stores the fault code in its fault memory. A technician can
access the stored fault codes manually using a “blink code”
diagnosis flashed out through the instrument cluster or using the
Digital Wrench™ Diagnostic Software. The ECM requires a
minimum of 7.0 volts to operate. The memory in the ECM is
operational the moment the battery cables are connected.
Depending on the significance or severity of the fault, normal
operation may continue, or a "Fail-Safe" operation may be
initiated. In the event a “Fail-Safe” mode occurs, a base fueling
table is used to determine the injector pulse width. This strategy
will not compensate for engine temperature, intake air
temperature, or altitude change, but instead operates based on
the latest valid information taken from those sensors.
CAUTION
Verify fuel system has been depressurized
before performing this procedure.
Squeeze Connector Tabs
ECM
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