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LANE B FAULT

  • Luiz Silva
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2 months 1 week ago #16990 by Luiz Silva
Luiz Silva created the topic: LANE B FAULT
I was flying and the LANE B light turned on steady.

In the FAULTS page it read the following message :

LANE B SENSOR STATUS
MANIFOLD AIR PRES

I think the manifold sensor for LANE B failed and therefore the LANE B computer stopped its four injectors, leaving LANE A to double the flow, and therefore the fuel flow increased from 13 liters/hour to 16 liters/hour.

any suggestions, help ???

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2 months 1 week ago - 2 months 1 week ago #16994 by Bill Hertzel
Bill Hertzel replied the topic: LANE B FAULT
The fuel injectors are not necessarily being disabled.
On any fault, the ECU will discontinue ECOnomy Mode and revert to POWER Mode. Your Fuel usage will increase due to the mixture being enriched.

There is a high possibility that the MAP sensor connector has become loose.
It is easy to unlock the connector accidentally.
There is a Service Instruction offering optional Clamps to prevent accidentally unlocking the connectors.

Check to make sure that the connectors on the MAP Sensors are secure.
Last Edit: 2 months 1 week ago by Bill Hertzel.
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2 months 1 week ago #16997 by Luiz Silva
Luiz Silva replied the topic: LANE B FAULT
I am quite impressed at the expertise we can find here at the forum !!!

Thank you very much Bill, I think you're on the right track and this FAULT may be just what you have pointed out.

One more question, I kept flying both times that FAULT appeared and although ROTAX is very clear about STEADY LANE lights inflight, I felt very secure since it was very clear to me all other sensors and functions of the LANE B were fine, not even speaking I still had a healthy LANE A, was I correct in my reasoning ?

thanks

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2 months 1 week ago - 2 months 1 week ago #16999 by Bill Hertzel
Bill Hertzel replied the topic: LANE B FAULT
The beauty of a fully redundant system is what would otherwise be a catastrophic failure becomes a minor incident.
Consider the MAP sensors.... The ECU looks at the throttle position and the MAPressure.
It looks up in its ECO or POWER table how much time to fire the injectors at each intake cycle.
Now if one MAP sensor gives an obvious bad reading it just ignores the reading and uses the other sensor and lights the alarm.
In theory, you could fly like this forever, what you do not have anymore is redundancy.
If one sensor just failed the other Might or Might Not be far behind. A big unknown.
If the second sensor were to go out of service, the ECM becomes blind and (Just Guessing here) blindly delivers full throttle fuel quantities.
The engine might run reasonably at full power but would start to flood as you backed off the throttle.
An engine limited to full power is way better than no power!

The cause of the failure is an unknown. The recommendation is to land as soon as practicable.
You do not need to land in the nearest field, but you are now on notice that a total failure MIGHT be in your near future.
Do You Feel LUCKY!!

If it turns out to be a loose connection on one MAP sensor you would have been OK continuing to the destination.
If it turned out that BOTH connectors were loose and the other one was minutes from also disconnecting... Bad choice.
If it turned out to be the engine was on fire and the other cable was about to burn through... another Bad choice.

The issue is that the ECM does not know the cause and recommends the most cautious solution. Land Soon!
You have more information as the pilot and can decide as you see fit depending on circumstances.

In any event with a steady lane light, I would continue cautiously, not touch the throttle, and not give up one foot of altitude until I was within gliding distance of a runway.
It would be reasonable to request landing priority due to engine problems and forgo the pattern take a straight-in approach.

Caution is always the best choice.
Last Edit: 2 months 1 week ago by Bill Hertzel.

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2 months 3 days ago #17021 by Luiz Silva
Luiz Silva replied the topic: LANE B FAULT
Strangely I still felt safer than flying with a single carburator ! LOL But I will take you words into consideration very seriously since your comments make a lot more sense than my intuition !!!

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2 months 2 days ago - 2 months 2 days ago #17025 by Bill Hertzel
Bill Hertzel replied the topic: LANE B FAULT
In truth, you were quite safe and might very well have been able to fly indefinitely, However...

Consider if you were flying a twin-engine aircraft.
Just after takeoff, you lose one engine.
Do you continue your planned 6-hour flight because the plane will fly just fine on one engine?
Or do you turn around and land and get the engine repaired before continuing?

Losing one MAP sensor or one engine just means you lost redundancy.
Redundancy is your insurance policy, and you just collected the benefits.
It is time to go buy another policy! ;)
~ ~ ~
Have you had a chance to inspect the connectors?
Last Edit: 2 months 2 days ago by Bill Hertzel.

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1 month 4 weeks ago #17044 by Luiz Silva
Luiz Silva replied the topic: LANE B FAULT
Yes Bill, I did inspect the conector, squirted a bit of WD40, reconnected it, tied the cable with a plastic tie, and everything is back to normal again !!!

FANTASTIC !!!

Thanks a lot for the wise advice !!!

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1 month 2 weeks ago - 1 month 1 week ago #17161 by Jim Flock
Jim Flock replied the topic: LANE B FAULT
I experienced a Lane B fault (solid light) yesterday. The only annunciation I received was "ECU fault." Once on the ground I shut down and restarted. No Lane B light on restart. Any advice?
Last Edit: 1 month 1 week ago by Jim Flock.

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1 month 2 weeks ago #17164 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
refer to service instruction SI-912 i-014. I used the cable tie method of improving the connector seating. Have not ordered the clamp p/n 638140 listed in the SI. A dongle is a great tool when monitoring a running engine, but a BUDS reader program is desirable for analyzing past faults. It is my understanding that one must attend the maintenance class in order to qualify for access to the reader program.?????? I have a level 2 dongle and extract the data at every 100hr inspection to a memory stick. It was very helpful in location of a failed EGT sensor with engine running.

I would use electronic contact cleaner vice WD 40. Most oils are not good conductors of electricity.

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1 month 2 weeks ago - 1 month 2 weeks ago #17166 by Jim Flock
Jim Flock replied the topic: LANE B FAULT

richard Boslaugh wrote: It is my understanding that one must attend the maintenance class in order to qualify for access to the reader program.??????


I am an iRMT so that's not an issue. I'm headed to the hangar now to take a look at the clamps.
Last Edit: 1 month 2 weeks ago by Jim Flock.

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1 month 2 weeks ago - 1 month 1 week ago #17170 by Jim Flock
Jim Flock replied the topic: LANE B FAULT

richard Boslaugh wrote: refer to service instruction SI-912 i-014. I used the cable tie method of improving the connector seating. Have not ordered the clamp p/n 638140 listed in the SI.


Checked my clamps today. Looks like I have the older version.

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Last Edit: 1 month 1 week ago by Jim Flock.

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1 month 2 weeks ago #17173 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
Jim, looking at your photo I don't see any cable ties compressing the two connector half's together. Find attached a photo that was sent to me from a rep at Kodiak industries at least a year ago. You must look closely to see two cable ties going around the connector half's axially and two pulling the half's together by being looped through the axial ties.

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1 month 2 weeks ago #17174 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
Also, the SI directs that the connectors be positioned in a certain fashion before inserting the clamps. I see in the photo that the left connector is not positioned correctly. I assume that has something to do with inserting the clamp.

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1 month 1 week ago - 1 month 1 week ago #17185 by Jim Flock
Jim Flock replied the topic: LANE B FAULT

richard Boslaugh wrote: Also, the SI directs that the connectors be positioned in a certain fashion before inserting the clamps. I see in the photo that the left connector is not positioned correctly. I assume that has something to do with inserting the clamp.


You are correct. The SI says "Make sure the connector latch shows vertically to the bottom." Mine is on top.

Are you convinced that this was the cause for the Lane B light coming on? I test ran the engine yesterday - no Lane lights.

PS - I ordered 2 of the new clamps this morning.
Last Edit: 1 month 1 week ago by Jim Flock.

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1 month 1 week ago #17188 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
Jim, No I am not convinced that solid lane B light is necessarily caused by intermittent connectors. Before I did the cable tie remedy I had flashing lane B light on several occasions. The only solid light was about a month ago while approaching to land. After landing I cycled the lane B switch and no more solid light. Have no lights since. Now if I had the BUDs reader program I could analyze past events to see what the solid light was about. True, I can look at extracted data but have no tables to decode fault info.

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1 month 1 week ago #17209 by Jim Flock
Jim Flock replied the topic: LANE B FAULT

Jim Flock wrote: PS - I ordered 2 of the new clamps this morning.


FYI - they were $35 each!

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1 month 1 week ago #17210 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
My,my, I think I will stay with the cable ties.

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4 weeks 13 hours ago #17361 by Dillon Stone
Dillon Stone replied the topic: LANE B FAULT
I had a similar issue except my Lane A light stayed illuminated. The fault log showed Manifold Pressure. This is an intermittent (not flickering) issue that usually appears after a high power check when the engine rpm settles back down to idle. After reading most of these forums, I noticed the trend is with Lane B. Do I have a different underlying issue or possibly some wires crossed?

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4 weeks 9 hours ago #17363 by richard Boslaugh
richard Boslaugh replied the topic: LANE B FAULT
Don't know about underlying problem, however, It is my understanding that one of the reasons most lane faults are on lane B is that lane B samples more often that lane A.

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4 weeks 9 hours ago #17364 by Dillon Stone
Dillon Stone replied the topic: LANE B FAULT
Is one MAP sensor designated for Lane A and the other for Lane B?

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