Ecm Service - Polaris Ranger 500 2x4 2007 Service Manual

ELECTRONIC FUEL INJECTION
To prevent engine over-speed and possible failure, an RPM-
limiting feature is programmed into the ECM. If the maximum
RPM limit (7000) is exceeded, the ECM will suppress the
ignition signal or injection signal. This process repeats itself in
rapid succession, limiting operation to the preset maximum.
RANGER 500 EFI RPM Limit:
This EFI system utilizes 2 methods -
"Hard" Limit - Ignition suppression occurs when RPM peaks
rapidly:
• High: 7000 RPM
• Returns: 6900 RPM
"Soft" Limit - Injector suppression occurs when RPM reaches
peak gradually:
• High: 7000 RPM
• Returns: 6900 RPM
RPM limits may vary slightly under operating conditions.
ECM Replacement
1. Remove the seat.
2. Remove the 4 retaining clips holding the ECM cover.
3. Remove the 4 screws and nuts holding the ECM.
4.30
ECM
ECM
4. With the ignition turned off, disconnect the wire harness by
pulling the black slider away from the ECM. Once the slider
is fully extended, pull the connector from the ECM, using
great care not to damage the harness connector or locking
mechanism.
NOTE: Should the black slider become broken,
replacement parts are available.
5. To install, reverse the procedures, DO NOT apply
dielectric grease to the connector, as it is a sealed connector.
Install the upper-left retaining screw spacer and screws.
Tighten screws to 10 in. lbs. (1.1 Nm).

ECM Service

Never attempt to disassemble the ECM. 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 ECM are pre-set.
No internal servicing or readjustment may be performed. If a
problem is encountered, and you determine the ECM to be
faulty, contact the Polaris Service Department for specific
handling instructions. Do not replace the ECM without factory
authorization.
The relationship between the ECM and the throttle position
sensor (TPS) is very critical to proper system operation. If the
TPS is faulty, or the mounting position of the TPS is altered, the
TPS must be re-initialized.
For the purpose of troubleshooting, a known-good ECM from
another Polaris 500 EFI may be used without system or engine
component damage.