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Rotax 914 yellow caution light blinking

 
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rehn(at)rockisland.com
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PostPosted: Sun Jun 02, 2013 9:01 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
The yellow caution light is blinking. The warning lights come on and go off as they should when the tcu is powered up, the waste gate cycles thru properly at startup as well. With the engine running the yellow light is not blinking at idle but starts to blink at about 2300 rpm and continues as rpms rise, go below 2300rpm and the light goes out. With the engine off and the turbo powered up the yellow light also is off at idle throttle setting and if I advance the throttle the light starts blinking and will stop as I pull back. So it seems that the throttle sensor is sending a signal to the tcu as it moves. But what is the issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me to remove the tcu and send it in for diagnoses. Anybody had this issue? I have searched this and have seen it discussed but the threads just end with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure it is adding boost too soon for the throttle setting which also points to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to a pc in dos! So I can't plug in my pc and test it myself. Anybody know if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry

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budyerly(at)msn.com
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PostPosted: Sun Jun 02, 2013 9:39 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Jerry,
The last time I talked to Dean at Lockwood, they weren't loaning their dongle, but I fly down there and have used theirs.

Your indications do point to a bad sensor.

Throttle sensor and waste gate I have discussed before so follow that. If the waste gate moves OK with the engine off while moving the throttle, then the throttle sensor is probably OK, and the servo is OK, that leaves airbox / ambient pressure senders, temp and TCU.

Your comment on the boost coming on too soon can be easily checked>

Put the MP on the airbox plug and check your AB pressure for yourself. Convert to millibars and check the graphs in the TCU manual. That checks the airbox sensor but not its signal.

Hard to diagnose without the Dongle and the old Dos 8 reader. With only a Dos reader, and a regular serial cable, I think you can still see throttle position, time and RPM. Try it and see.

Now you can see why I spent the bucks for the new TCU.

As for the carb float arms, just setting them parallel to the carb base seems to work OK. Even using the $100 tool, it still comes out that way. So what the heck. If it isn't flooding and runs OK it works for me.

Regards,
Still grounded for lack of a new fuel line fitting to the carb.
Bud
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europaxs(at)gmail.com
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PostPosted: Sun Jun 02, 2013 10:26 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
You can rent the dongle from Lockeeood for around 50$ (we rented it about 8 years ago so price might have gone up). 
​Well worth it!  Within 15 mins I knew what was wrong and recalabrated the throttle. 
Matt Carpenter 

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On Sun, Jun 2, 2013 at 12:04 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:
Quote:

--> Europa-List message posted by: Jerry Rehn <rehn(at)rockisland.com>

The yellow caution light is blinking. The warning lights come on and go off as they should when the tcu is powered up, the waste gate cycles thru properly at startup as well. With the engine running the yellow light is not blinking at idle but starts to blink at about 2300 rpm and continues as rpms rise, go below 2300rpm and the light goes out. With the engine off and the turbo powered up the yellow light also is off at idle throttle setting and if I advance the throttle the light starts blinking and will stop as I pull back. So it seems that the throttle sensor is sending a signal to the tcu as it moves. But what is the issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me to remove the tcu and send it in for diagnoses. Anybody had this issue? I have searched this and have seen it discussed but the threads just end with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure it is adding boost too soon for the throttle setting which also points to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to a pc in dos! So I can't plug in my pc and test it myself. Anybody know if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry

Sent from my iPad

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rehn(at)rockisland.com
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PostPosted: Sun Jun 02, 2013 11:10 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
Thanks Matthew, was your light behaving like mine?
Jerry

Sent from my iPad

On Jun 2, 2013, at 11:25 AM, "Matthew Carpenter" <europaxs(at)gmail.com (europaxs(at)gmail.com)> wrote:

[quote]You can rent the dongle from Lockeeood for around 50$ (we rented it about 8 years ago so price might have gone up). 
​Well worth it! Within 15 mins I knew what was wrong and recalabrated the throttle.
Matt Carpenter

—
Sent from Mailbox for iPhone

On Sun, Jun 2, 2013 at 12:04 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:
Quote:

--> Europa-List message posted by: Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)>

The yellow caution light is blinking. The warning lights come on and go off as they should when the tcu is powered up, the waste gate cycles thru properly at startup as well. With the engine running the yellow light is not blinking at idle but starts to blink at about 2300 rpm and continues as rpms rise, go below 2300rpm and the light goes out. With the engine off and the turbo powered up the yellow light also is off at idle throttle setting and if I advance the throttle the light starts blinking and will stop as I pull back. So it seems that the throttle sensor is sending a signal to the tcu as it moves. But what is the issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me to remove the tcu and send it in for diagnoses. Anybody had this issue? I have searched this and have seen it discussed but the threads just end with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure it is adding boost too soon for the throttle setting which also points to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to a pc in dos! So I can't plug in my pc and test it myself. Anybody know if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry

Sent from my iPad ============= ">http://www.matronics.com/Navigator?Europa-List ronics.com www.matronics.com/contribution


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rehn(at)rockisland.com
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PostPosted: Sun Jun 02, 2013 5:29 pm    Post subject: Rotax 914 yellow caution light blinking Reply with quote
I looked at the rotax maintenance manual and they have a process to test the throttle sensor, I goy out my ohm meter and did the test. The sensor is definitely bad. So this makes a lot of sense for the issues I have been having. Will update when I install the new sensor.
Jerry

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On Jun 2, 2013, at 12:09 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:

[quote]Thanks Matthew, was your light behaving like mine?
Jerry

Sent from my iPad

On Jun 2, 2013, at 11:25 AM, "Matthew Carpenter" <europaxs(at)gmail.com (europaxs(at)gmail.com)> wrote:

Quote:
You can rent the dongle from Lockeeood for around 50$ (we rented it about 8 years ago so price might have gone up).
​Well worth it! Within 15 mins I knew what was wrong and recalabrated the throttle.
Matt Carpenter

—
Sent from Mailbox for iPhone

On Sun, Jun 2, 2013 at 12:04 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:
Quote:

--> Europa-List message posted by: Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)>

The yellow caution light is blinking. The warning lights come on and go off as they should when the tcu is powered up, the waste gate cycles thru properly at startup as well. With the engine running the yellow light is not blinking at idle but starts to blink at about 2300 rpm and continues as rpms rise, go below 2300rpm and the light goes out. With the engine off and the turbo powered up the yellow light also is off at idle throttle setting and if I advance the throttle the light starts blinking and will stop as I pull back. So it seems that the throttle sensor is sending a signal to the tcu as it moves. But what is the issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me to remove the tcu and send it in for diagnoses. Anybody had this issue? I have searched this and have seen it discussed but the threads just end with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure it is adding boost too soon for the throttle setting which also points to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to a pc in dos! So I can't plug in my pc and test it myself. Anybody know if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry

Sent from my iPad ============= ">http://www.matronics.com/Navigator?Europa-List ronics.com www.matronics.com/contribution




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PostPosted: Sun Jun 02, 2013 6:46 pm    Post subject: Rotax 914 yellow caution light blinking Reply with quote
Yes, sure was.

Found that the throttle was not calibrated like it should have been. Once we knew the positions 110%,100%,75%,65%,etc.. we marked them on the throttle.
No issues after that.

On Jun 2, 2013, at 2:09 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:
[quote]Thanks Matthew, was your light behaving like mine?
Jerry

Sent from my iPad

On Jun 2, 2013, at 11:25 AM, "Matthew Carpenter" <europaxs(at)gmail.com (europaxs(at)gmail.com)> wrote:

Quote:
You can rent the dongle from Lockeeood for around 50$ (we rented it about 8 years ago so price might have gone up).
​Well worth it! Within 15 mins I knew what was wrong and recalabrated the throttle.
Matt Carpenter

—
Sent from Mailbox for iPhone

On Sun, Jun 2, 2013 at 12:04 PM, Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)> wrote:
Quote:

--> Europa-List message posted by: Jerry Rehn <rehn(at)rockisland.com (rehn(at)rockisland.com)>

The yellow caution light is blinking. The warning lights come on and go off as they should when the tcu is powered up, the waste gate cycles thru properly at startup as well. With the engine running the yellow light is not blinking at idle but starts to blink at about 2300 rpm and continues as rpms rise, go below 2300rpm and the light goes out. With the engine off and the turbo powered up the yellow light also is off at idle throttle setting and if I advance the throttle the light starts blinking and will stop as I pull back. So it seems that the throttle sensor is sending a signal to the tcu as it moves. But what is the issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me to remove the tcu and send it in for diagnoses. Anybody had this issue? I have searched this and have seen it discussed but the threads just end with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure it is adding boost too soon for the throttle setting which also points to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to a pc in dos! So I can't plug in my pc and test it myself. Anybody know if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry

Sent from my iPad ============= ">http://www.matronics.com/Navigator?Europa-List ronics.com www.matronics.com/contribution





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paul.the.aviator(at)gmail
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PostPosted: Mon Jun 03, 2013 6:16 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
Jerry, I think among my box of bits I have a spare throttle sensor that I can lend you for trouble shooting.  Let me know if you need it and I'll toss it in the post. - Paul
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rehn(at)rockisland.com
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PostPosted: Mon Jun 03, 2013 6:40 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
Paul
Thanks for the offer, I tested mine per the rotax manual and it is defiantly shot! I need to replace it.
Jerry

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On Jun 3, 2013, at 7:15 AM, Paul McAllister <paul.the.aviator(at)gmail.com (paul.the.aviator(at)gmail.com)> wrote:

[quote]Jerry, I think among my box of bits I have a spare throttle sensor that I can lend you for trouble shooting. Let me know if you need it and I'll toss it in the post. - Paul
Quote:


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PostPosted: Tue Jun 04, 2013 8:15 am    Post subject: Rotax 914 yellow caution light blinking Reply with quote
I probably have a good one I can sell you.... I thought mine was shot a long time back but it wasn't and I bought it second hand. If you are interested then let me know and I'll dig through my stuff.  I know that the price of a new one will make your eyes water.


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rehn(at)rockisland.com
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PostPosted: Tue Jun 04, 2013 4:07 pm    Post subject: Rotax 914 yellow caution light blinking Reply with quote
I have one on the way already. They are crazy pricey, and I guess I was too anxious to get one.
They say boating is a hole in the water that you throw money into, aircraft much the same except the hole is in the air!
Thanks again for your offer.
Regards
Jerry

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On Jun 4, 2013, at 9:14 AM, Paul McAllister <paul.the.aviator(at)gmail.com (paul.the.aviator(at)gmail.com)> wrote:

[quote]I probably have a good one I can sell you.... I thought mine was shot a long time back but it wasn't and I bought it second hand. If you are interested then let me know and I'll dig through my stuff. I know that the price of a new one will make your eyes water.


Quote:


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