4.12
9924864 - 2012-2014 SPORTSMAN 800 / 6X6
© Copyright 2013 Polaris Sales Inc.
ELECTRONIC CONTROL UNIT (ECU)
Operation Overview
The ECU 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 (on/off),
crankshaft position and speed (RPM), throttle position,
engine coolant temperature, air temperature, intake
manifold air pressure and battery voltage. The ECU
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 ECU then sends output signals to set the
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 Malfunction Indicator Light (MIL) (Check Engine
Light) on the speedometer 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 access the stored fault code
using a “blink code” diagnosis flashed out through the
Instrument cluster. 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, a rev-
limiting feature is programmed into the ECU. If the
maximum RPM limit (6500) is exceeded, the ECU
suppresses the injection signals, cutting off the fuel flow.
This process repeats it self in rapid succession, limiting
operation to the preset maximum.
Sportsman 800 EFI RPM Limit:
Hard Limit - Injector suppression occurs
• High: 6500
• Low: 6500
• Neutral: 6500
• Reverse: 6500
• Park: 6500
Soft Limit - Timing suppression occurs
• High: None
• Low: 6300
• Neutral: 6300
• Reverse: 6300
• Park: 6300
FUEL SYSTEM - GENERAL
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