Snowmobile Polaris 2006 - 2007 FS / FST. Manual - part 67

12.23

Chassis Electrical System

12

Rev. 1 07/2006

Forward / Reverse Limit Switch Circuits

The forward / reverse switches allow the ECU to determine the
position of the shift fork inside the chaincase. In forward, the
forward limit switch is depressed. When depressed, battery
voltage is routed to the ECU via the forward limit switch signal
circuit. In reverse, the reverse limit switch is depressed. When

depressed, battery voltage is routed to the ECU via the reverse
limit switch signal circuit.

Perc 4 Forward Reverse Controller Circuit

The Perc 4 reverse controller is a polarity-switching driver
module that can operate the reverse motor either clockwise or
counter clockwise by changing the polarity of the power and
ground circuits.

The ECU commands the reverse controller via the reverse PWM
signal circuit.

The Perc 4 reverse system works in the following manner:

12.24

Chassis Electrical System

Rev. 1 07/2006

1.

Operator requests reverse gear while the engine is running.

2.

ECU determines if the shift fork is in the forward or reverse
position by analyzing the FWD and REV limit switch
signal returns. If the ECU cannot determine the position of
the shift fork, the operator’s request for reverse gear will be
canceled and a diagnostic trouble code generated.

3.

The ECU will “request” reverse gear from the reverse
controller module. The controller will then activate the
reverse actuator motor which connects to a worm gear
inside the chaincase. The ECU will signal the controller to
stop the worm gear when the REV limit switch is depressed

by the moving shift fork. If the reverse controller
determines that a problem exists with the actuator motor or
shift fork worm gear, the controller will shut down, alert the
ECU, and a diagnostic trouble code will be generated.

4.

The process when shifting from REV gear to FWD gear is
the same as described when moving from FWD to REV
gear. The ECU, and reverse controller will always return
the shift fork to the FWD position whenever the machine
is started. The ECU will also command the motor to drive
the shift fork FWD a second time to ensure the transmission
is in FWD gear.

12.25

Chassis Electrical System

12

Rev. 1 07/2006

Multi-Function Display (MFD) Circuits

12.26

Chassis Electrical System

Rev. 1 07/2006

Multi-Function Display Power Circuit

Multi-Function Display Inputs / Outputs