Speed Limiter System - Theory Of Operation; Reverse Speed Limiter System; Electronic Throttle Control (Etc) - Theory Of Operation - Polaris Magnum 2x4 Service Manual

Speed Limiter System - Theory of Operation
The Speed Limiter system controls vehicle speed by
electronically limiting engine RPM in reverse, or in the
event of a mechanical problem in the throttle control
mechanism. There are two separate limiting systems -
the Reverse Speed Limiter system and the Electronic
Throttle Control (ETC) system. Although the two
systems are independent of each other, they share a
common part - the limiter module. When activated,
the limiter module grounds the ignition stop circuit
through the COl black wire, creating a "misfire" which
prevents engine RPM from going above the "Reverse
Limit" or "ETC Limit" RPM. The limits are designed into
the limiter module for a given model, and cannot be
changed or adjusted.
Reverse Speed Limiter System - In order to fully
understand and troubleshoot the Reverse Speed
Limiter system, it is important to remember that limiting
will occur whenever two input "signals" are present at
the limiter module:
1. The limiter module must receive voltage through the
reverse light circuit (Green or Gray/Orange wire).
and ...
2. Engine RPM must be at or above the "Reverse
Limit". The RPM signal is delivered to the limiter
module via the Yellow/Red alternator wire.
When both of these inputs are present, the system will
limit. Below the "reverse limit" RPM, the ignition
system will operate normally.
Electronic Throttle Control (ETC) -
Theory of
Operation
The limiter also incorporates a throttle safety feature
called the Electronic Throttle Control (ETC). When
there is a mechanical problem in the throttle
mechanism (throttle plate, throttle shaft, or cable) and
the throttle lever is released, the ETC switch contacts
close. Power is delivered to the limiter module through
the white wire, and engine RPM is limited to the "ETC
limit". It is important to remember that ETC limiting will
occur whenever two input "signals" are present at the
limiter module:
1. The limiter module must receive voltage through the
ETC switch circuit (White wire).
and ...
2. Engine RPM must be at or above the "ETC Limit".
The RPM signal is delivered to the limiter module via
the Yellow/Red alternator wire.
Refer to following pages for test procedure.
ELECTRICAL
Speed Limiter System
I
Speed Limiter
I
Module
Y/R
RPM Signal
GRN or GRY/OR
OVERR I DE S'I/ ITCH
LEFT HANDL EBAR
I~
L
I
PUR
I
W (To ETC)
BlkWire
COl
I - -
Module
Gry/W
RI'
I
Ie
I
';;Ba;;;tt;;;;;erY=v=ol=ta::ge;.....".:,~-l-~---E-.
GRN I'll
I
----t-
GR Y I'll
Gear Selector Switch
(Reverse Selected)
Speed Limiter Circuit (Typical)
Speed Limiter Circuit Wires Shown In Bold
9
I
Speed Limiter
Module
I
Batterv Volta
0'
Y/R
RPM Signal Blk
COl
I - -
GRN or GRY/OR
Module
(From Override Switch)
- -
Battery Voltage ETC SW ITCH
R/\II-~ W
(~LE
HOUS I NG I
CLOSE ON THROTTLE
CABLE SLACK
Electronic Throttle Control Circuit (Typical)
Electronic Throttle Control Circuit Wires
Shown I n Bold
NOTE: The reverse RPM limit will override the ETC Limit when both are receiving voltage.
Polaris Industries Inc.
10.33
12/97