Electronic Control Unit (Ecu); Operation Overview; Ecu Service - Polaris Sportsman XP 1000 S 2020 Service Manual

ENGINE ELECTRICAL

ELECTRONIC CONTROL UNIT (ECU)

OPERATION OVERVIEW

The Electronic Control Unit (ECU) is a solid state
component that serves as the controller for the fuel
injection system.
The ECU receives input from the EFI sensors including,
but not limited to:
• Engine Coolant Temperature (ECT) Sensor
• Oxygen Sensor
• Temperature / Manifold Absolute Pressure (T-MAP)
Sensor
• Throttle Position Sensor (TPS)
NOTICE
The TPS is built into the Electronic Throttle Control
The inputs cause the ECU to respond based on its
software calibration. The ECU responds by opening and
closing the output circuits of the EFI system. These
include but are not limited to:
• Electronic Throttle Control (ETC)
• Fuel Injectors
• Ignition Coil
• Oxygen Sensor Heater
During operation, the ECU continually performs
diagnostic checks of itself, each of the sensors, and
system performance. If a fault is detected, the ECU turns
on the "Check Engine" light in 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.
4.12
(ETC).
A technician can determine the cause of the "Check
Engine" light by referencing the Master Trouble Code list
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 (7600) is exceeded, the ECU
suppresses the injection signals, cutting off the fuel flow.
This process repeats itself in rapid succession, limiting
operation to the preset maximum.
Maximum RPM Limit:
RPM Limit:
Hard Limit - Fuel injector suppression occurs
All Gears: 7600 RPM
Soft Limit - Spark timing suppression occurs
All Gears: 7250 RPM

ECU SERVICE

Never attempt to disassemble the ECU. It is sealed to
prevent damage to internal components. Warranty is void
if the case is opened or tampered with in any way.
All operating and control functions within the ECU are
pre-set. No internal servicing or readjustment may be
performed. If a problem is encountered, and you
determine the ECU to be faulty, the assembly needs to
be replaced. Do not replace the ECU under warranty
without factory authorization. Coverage does not apply
without authorization from Polaris Technical Service.
For the purpose of troubleshooting, a known-good ECU
from another Polaris vehicle of the same model and year
may be used, but ensure that you do not put an ECU
from a machine equipped with EPS into a non-EPS
model. This will force update the cluster, and it will be
permanently set it as an EPS cluster, leaving the EPS
warning light on with no way of turning it off.
9931493 R03 - 2020-2021 Sportsman XP 1000 S Service Manual
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