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  1. #1

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    MSX 150 - incorrect hose connections to solenoid?

    Been reading alot about limited RPM problems as I have the same problem as being described here.

    I believe my problem lies with the rubber hoses going on the wastegate solenoid itself. I had a shop do some work on the machine and they goofed a couple of things up. One thing I found is a "screw" put in the open pipe on the wastegate solenoid. They must have thought that it was supposed to be plugged. I took the screw out.

    Now I wonder if they have the rubber hoses hooked to the wrong ends of the solenoid. The solenoid I have has 3 pipes coming from it. One is on the end by the electrical connector. This hose comes from under the engine...turbo area. The other outlet pipe has a hose that goes to the wastegate valve. On the same pipe, there is a pipe that sticks up and is open (now that I took the screw out of it).

    Just wondering if these are plumbed correctly or are the hoses on the wrong ends? Thanks.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by K447; 09-07-2012 at 08:22 AM.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    What operational problem or symptoms are you having with this machine?

  3. #3
    ripcuda's Avatar
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    Welcome to GreenHulk!

    Yes, that wastegate solenoid is hooked up wrong. The hose going to the wastegate solenoid needs to be on the other port that sticks out the side. The one where it is hooked in the picture needs to be left unconnected and unplugged. The single port on the other end of the solenoid (bottom) has a hose that connects to the turbo compressor scroll (there is a barb there to hook the hose to). This provides the boost-only reference directly off the turbo.

    You should be able to blow through that side port and hear it hiss down at the turbo... while it's in its unpowered/off state... but not the top port (after you remove the hose). When the ECU sends power to it, it "clicks" and switches flow to the upper port. This allows the ECU to control the boost of the turbo.

    Cheers!

  4. #4

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    Ripcuda,

    Thanks for the info. I couldn't find anything that showed me the correct arrangement. I am new in this forum...but sure glad to see all of the history here. I will give this a try tomorrow. Today I was going to check this out after having pulled the screw from the solenoid and when I got to the water, I now have a problem where I can't get over 3400 rpms. So been doing a lot of reading on that. Everything is pointing toward the IFB Module...funny how it just worked yesterday. So I have to get my 3400 problem fixed first. One symptom I am having is that when I insert my lanyard, the display on the dash does not wake up. Don't hear anything moving or making noise with the seat off. Even when i pull the throttle.
    Oil level is good...
    Will let you know how that goes. Thanks. Steve
    Last edited by bshunting; 09-07-2012 at 01:49 PM.

  5. #5
    ripcuda's Avatar
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    Yeah... that 3400 rpms is the ECU limited max revs when it's engaged in reverse. So if your not in reverse, the IFB would be suspect.

    Here is what the service manual says about it:

    System Interface Box (SIFB)
    Theprimary function of the SIFB is to power--down the ignition systemin the event that the lanyard is left inserted
    in the stop switch for more than two minutes. Without the SIFB, the ignition system would remain powered--up
    by the battery, and the battery would completely discharge.
    A secondary function of the SIFB is to convert the reverse switch signal so the ECU can interpret the signal when
    the reverse switch is closed, thereby limiting engine RPM.

    How It works
    The SIFB will disconnect the ECU ignition circuit and go
    into the “sleep” mode in the event that the lanyard is left
    installed in the stop switch formore than twominutes. This
    also holds true whenever the operator pushes the stop button
    momentarily while the engine is running.
    In theevent that the operator removes the lanyard fromthe
    stop switch while the engine is running, the SIFB does
    nothing.

    To power--up the ECU after the SIFB has entered the
    “sleep” mode, the operator must re--insert (if removed) the
    lanyard into the stop switch, and press the start button.
    NOTE: The SIFB remains in the mode in which it
    was put into by the operator’s last action. For example,
    the SIFB will allow the ECU to power--up immediately
    when the lanyard is installed if the operator’s
    last action was removing the lanyard to kill the
    engine.

    Conversely, if the operator’s last action was leaving
    the lanyard in the stop switch for more than two
    minutes or stopping the engine by pushing the stop
    button, the ECU will not power--up until the SIFB
    “sees” a start signal generated by the operator
    pushing the start button.

    SIFB Diagnostics Mode
    There will be situations where a user will want to defeat the sleepmode function of the SIFB. One such situation
    is when a technician is connected to the ECU with the Digital Wrencht diagnostic software program.
    To enter the SIFB diagnostic mode, follow these steps:
    1. Insert the lanyard into the stop switch, and start the engine. Stop the engine by removing the lanyard.
    2. Wait for15 seconds, then re--insert the lanyard. Quickly push the STOP button three times within the first
    three seconds, then tap the START button.
    The SIFB is now in the diagnostics mode. Power will be supplied to the ECU for as long as the lanyard remains
    installed.

    To exit the diagnostics mode, remove the safety lanyard from the STOP switch and wait for at least 15 seconds.

    NOTE: To verify the ignition system is powered--up after inserting the lanyard into the stop switch,
    move the throttle flipper from full closed to full open while the engine is off. The throttle plate can
    always be heard moving with the flipper movement when the ignition system has power.
    Cheers!

  6. #6

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    Is there a way to bypass the IFB just to make sure that is the problem by eliminating it from the circuit?

  7. #7
    isaacv375's Avatar
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    Welcome to greenhulk, hey bshunting, here is how to install the solenoid ....

    Click image for larger version. 

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  8. #8

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    Thanks a bunch! Ordering a new IFB module now to fix my 3400 RPM max problem....hopefully it works!

    Anyone know where I can get a SIFB P/N: 2410507?

    Thanks,
    Steve
    Last edited by bshunting; 09-08-2012 at 11:59 AM.

  9. #9
    Hello ,

    Look at this principe of admission picture , some soleinoide are differents a blu point was write on it , i hope this picture can help you ?
    Click image for larger version. 

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    good day

  10. #10

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    The new IFB Module corrected my 3400 rpm problem. Thanks to all! Steve

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