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  1. #1

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    Start/Stop button operation??

    Can anyone give me the "theory of operation" for the start/stop combination button on a Polaris TX. Obviously it switches from a power to starter solenoid when motor is not operating to a ignition shut-off when engine is opeating although I cant really figure it out from the wiring diagram. I think the bilge may also play a part. Thanks in advance

    Alan


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow How the combination Start/Stop button works on Virage and Genesis carburetor engines

    The Start/Stop button, when pressed, feeds battery voltage to one side of the starter solenoid coil.

    The other side of the solenoid coil goes into the LR-50x module. The LR module knows whether the engine is running, or not running, by monitoring the Yellow engine RPM signal.

    When you press the button, if the LR module thinks the engine is stopped, it internally links the coil 'negative' side to the Purple/White wire.

    The Purple/White wire then goes through the MFI display. If the MFI display is not 'Locked', then the Purple/White wire is grounded by the MFI display.

    When starting the engine, the power from the Start button goes through the solenoid coil, through the LR module, and through the MFI display to ground. The solenoid activates, and the engine cranks.

    When the engine is running, and you press the Start/Stop button, the LR module sees the voltage coming through the solenoid coil. It knows the engine is running because the Yellow RPM wire is active.

    So the LR module does not link the solenoid coil to ground. Instead, it sends a ground signal via the Black/Yellow wire to the CDI, which shuts down the engine ignition.

  3. #3

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    Quote Originally Posted by K447 View Post
    The Start/Stop button, when pressed, feeds battery voltage to one side of the starter solenoid coil.

    The other side of the solenoid coil goes into the LR-50x module. The LR module knows whether the engine is running, or not running, by monitoring the Yellow engine RPM signal.

    When you press the button, if the LR module thinks the engine is stopped, it internally links the coil 'negative' side to the Purple/White wire.

    The Purple/White wire then goes through the MFI display. If the MFI display is not 'Locked', then the Purple/White wire is grounded by the MFI display.

    When starting the engine, the power from the Start button goes through the solenoid coil, through the LR module, and through the MFI display to ground. The solenoid activates, and the engine cranks.

    When the engine is running, and you press the Start/Stop button, the LR module sees the voltage coming through the solenoid coil. It knows the engine is running because the Yellow RPM wire is active.

    So the LR module does not link the solenoid coil to ground. Instead, it sends a ground signal via the Black/Yellow wire to the CDI, which shuts down the engine ignition.
    Great information, thank you. I am also curious what role the bilge plays in the electrical function. The positive side is connected to the LR505 and CDI and push button (orange wires). Does the pump need to run before the engine will start?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by IndyAl View Post
    Great information, thank you. I am also curious what role the bilge plays in the electrical function. The positive side is connected to the LR505 and CDI and push button (orange wires). Does the pump need to run before the engine will start?
    The LR module powers the Orange wire whenever the engine is cranking.

    When you press the Start button, the engine begins cranking. The LR module sees the RPM signal on the Yellow wire, and powers up the Orange wire.

    The Orange wire powers up the Bilge pump, and more importantly, powers up the CDI.

    The CDI wakes up, sees the exciter and Hall Effect signals from the stator, and begins firing the spark plugs.

    The Bilge pump Button on the handlebar provides a direct power feed to the Orange wire. This powers the bilge pump, but it also provides power to the CDI. This is why holding the bilge pump button can provide useful diagnostic information.

    If the LR module for some reason is NOT proving full battery power to the CDI (and the bilge pump), then pressing the bilge pump button will over-ride the LR module voltage output, and force full battery power to the CDI.

    If the actually problem is in the grounding side of things, then the results of pressing the bilge pump button are not so clear.

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