
4
4.17
9924874 R02 - 2014
RZR
XP / XP 4 1000 Service Manual
© Copyright 2013 Polaris Industries Inc.
The ECU controls the amount of fuel being injected and
the ignition timing by monitoring the primary sensor
signals for intake air temperature, manifold absolute
pressure (load), engine temperature, engine speed
(RPM) and throttle position. These primary signals are
compared to the programming in the ECU computer chip,
and the ECU adjusts the fuel delivery and ignition timing
based on these values.
During operation, the ECU has the ability to re-adjust
temporarily; providing compensation for changes in
overall engine condition and operating environment, so it
will be able to maintain the ideal air/fuel ratio.
During certain operating periods such as cold starts,
warm up, acceleration, etc., a richer air / fuel ratio is
automatically calculated by the ECU.
Initial Priming / Starting Procedure
NOTE: The injection system must be purged of all
air prior to the initial start up, and / or any time the
system has been disassembled.
If the EFI system is completely empty of fuel or has been
disassembled and repaired:
1.
Cycle the key switch from “OFF” to “ON” 6 times,
waiting for approximately 3 seconds at each “ON”
cycle to allow the fuel pump to cycle and shut down.
2.
Once step 1 is completed, turn the key switch to
“START” until the engine starts or 5 seconds has
passed.
3.
If the engine failed to start, repeat step 1 for 2 more
cycles and attempt to start the engine.
If the engine fails to start, a problem may still exist,
and should be diagnosed.
NOTE: Accurate testing of EFI components is
recommended
utilizing
the
Digital
Wrench®
Diagnostic Software (dealer only).
ELECTRONIC CONTROL UNIT (ECU)
Operation Overview
The ECU (Item 1) 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 ECU. Signals to the ECU include:
ignition power (on/off), intake air temperature, manifold
absolute pressure (load), engine coolant temperature,
crankshaft position and engine speed (RPM), throttle
position and battery voltage. The ECU compares the
input signals to the programmed maps in its memory and
determines
the
appropriate
fuel
and
ignition
requirements for the immediate operating conditions.
The ECU then sends output signals to set injector
duration and ignition timing.
During operation, the ECU continually performs a
diagnostic check of itself, each of the sensors, and
system performance. If a fault is detected, the ECU turns
on the “Check Engine” light on the instrument cluster and
stores the fault code in its fault memory. Depending on
the significance or severity of the fault, normal operation
may continue, or "Fail-Safe" operation (slowed speed,
richer running) may be initiated. A technician can
determine the cause of the “Check Engine” light by
referencing
the
“Instrument
Cluster
Trouble
Code
Display” and “Diagnostic Trouble Code Table” or by using
Digital Wrench®. The ECU requires a minimum of 7.0
volts to operate. The memory in the ECU is operational
the moment the battery cables are connected.
To prevent engine over-speed and possible failure, an
RPM limiting feature is programmed into the ECU. If the
maximum RPM limit is exceeded, the ECU suppresses
the injection signals, cutting off the fuel flow and retards
the ignition timing. This process repeats it self in rapid
succession, limiting operation to the preset maximum.
RPM Limit: 8800
ELECTRONIC FUEL INJECTION
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Страница 472: ...HARNESS CHASSIS RZR XP 1000 ...
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