Page 197 - Manual Oficina Polaris RS1 2018 e 2019

FUEL SYSTEM

ELECTRONIC CONTROL UNIT (ECU) ECU SERVICE
Never attempt to disassemble the ECU. It is sealed to
OPERATION OVERVIEW prevent damage to internal components. Warranty is void

The ECU q is the brain or central processing computer if the case is opened or tampered with in any way.
of the entire EFI fuel/ignition management system. All operating and control functions within the ECU are
During operation, sensors continuously gather data pre-set. No internal servicing or readjustment may be
which is relayed through the wiring harness to input performed. If a problem is encountered, and you
circuits within the ECU. Signals to the ECU include: determine the ECU to be faulty, contact the Polaris
ignition power (on/off), intake air temperature, manifold Service Department for specific handling instructions. Do
absolute pressure (load), engine coolant temperature, not replace the ECU without factory authorization.
crankshaft position and engine speed (RPM), throttle
position and battery voltage. The ECU compares the For the purpose of troubleshooting, a known-good ECU
input signals to the programmed maps in its memory and from another Polaris RZR of the same model may be
determines the appropriate fuel and ignition used without system or engine component damage.
requirements for the immediate operating conditions.
The ECU then sends output signals to set injector ECU REPLACEMENT 4
duration and ignition timing.
Although the need for ECU replacement is unlikely, a
specific replacement procedure is required to ensure that
all essential data contained within the original ECU is
transferred to the replacement ECU.

NOTE
Refer to this procedure and carefully follow all
instructions provided in Digital Wrench®.

1. Carefully follow the ECU replacement instructions
provided in Digital Wrench® to ensure that all
essential data contained within the original ECU is
transferred to the replacement ECU.
2. Remove the black plastic cover by lifting up on the
tab.
3. Remove the screws w that attach the ECU to the
During operation, the ECU continually performs a console.
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

9928689 - 2018 RZR RS1 Service Manual 4.11
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