f200txr Is not idling or running well, getting a code 29

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

Reading when I disconnected the ISC:

Monitor Item Result Unit
Engine speed 0 r/min
Intake pressure 100.68 kPa
Intake pressure 29.8 inHg
Atmospheric pressure 1006.8 hPa
Atmospheric pressure 29.8 inHg


With ISC connected:

Monitor Item Result Unit
Engine speed 0 r/min
Intake pressure 117.44 kPa
Intake pressure 34.76 inHg
Atmospheric pressure 1066.7 hPa
Atmospheric pressure 31.6 inHg


Reading all done with in mins of each other so the Atmospheric pressure should be the same on both readings. Also the Intake pressure and At Pressure should be the same on all normal readings.

Contacted Yamaha Directly. Wow what great people over there. They have a 800 number and I was able to talk tech talk with a live Master Tech. Made it easy to dignose. He looked up in his Yamaha Technical Service Guide some trouble shooting question. And was able to help me dignose the problem.

Also was able to give me the variables to check the ISC. Turns out a bad ISC/stuck open ISC valve can give out a code 29 error. So that was the problem. ISC valve was unplugged and I got no more code 29. Also I told the tech that the motor would not idle, back fired, and stalled out. He said if all other machanical problem have been check then it sounded like a ISC problem with the code also being 29. He found that in the Yamaha Technical Service Guide.

I was able to purchase the YTSG on ebay today for only $30.00 So I will have it in the future.

As Rodbolt said, do a voltage check on the black and orange wire of the IAPS. Yamaha tech told me that the black and orange wire also is on the TPS and they should be all 5 volts. using a peak voltage meter.

And that is what I got on both sensors 5 volts when the ISC was not connected. Other then that it was off by 1 to 2 volts.

I ordered the ISC today should be here in a week. Will keep you guys posted. Sure would like to go diving with my daughter. I will post picture of my boat for you guys can check it out.

Thx again to Rodbolt post and Justintime on the phone calls..

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

Pictures of boat with old J225txcub87 and then with F200txr and 9.9 Yamaha's.

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

My Daughter Keely and I Diving in Catalina, CA.

The Two things I love the most.. In the Picture Order.. Keely and My Boat.

Larry

 

[rodbolt]

Re: f200txr Is not idling or running well, getting a code 29

no worries
sorry I could not describe it better but I did try to tell ya not to buy a sensor based on a code.
if the 5V reference is being loaded by another sensor the ECU may not detect it.
almost all the sensors on yamaha EFI motors are a wiper type using a 5 volt reference with a pick off voltage being fed back to the ECU.
as most of these sensors use a varying voltage any drop in the reference voltage may set a code.
if ya look on the yamaha website for master techs you will see my picture.
however unlike the factory guys,most with no field experience, I actually have to deal with this stuff every day
aint a better job in the world .
the ISC valve also known as an IAC for the rest of the world, can do funny things.
the F200/225 does not use any air bypass past the throttle shutters at idle and relies on the ISC(IAC) for air.
it also uses the MAP sensor for fuel/timing below about 1200 RPM
glad you could chat with Yamaha tech services. real nice folks.
while the back fire could be an ISC isue its also possible its not.
remove the plastic top cover. trace the 3/4" grey hose to the back of the engine between the ISC and the ISC air intake.
remove it. manually throtthe the air and you may see a smooth idle.
like I said, many tricks are availible to "fake" the system once you understand how it all has to work together.
if ya really wanna go nuts test HPDI .

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

Wow. ya, I saw your picture, justintime thinks highly of you and showed me a picture. Ya, I ended up going to the University of Montana to Study accounting. If I could do it all over again I would have went to Marine School and got all my certifications instead. I know I can still go and do it, but I am a single parent and can't take off right now to go back to school. I am thinking once my daughter goes to collage I may go back to learn marine engines.

Sorry I didn't have the time for you to get back to me, the way it takes so much time to order parts. There is no boat part store around here that stores part inventory. It is going to take a week to order the ISC sensor.

Also what do you think about this book I purchased on ebay??

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

Rodbolt,

Here is something that I found that you wrote about the ISC. My symtoms were not exactly the same, but close. What was really close was the why you discribed the error code 29..

Larry


July 26th, 2006, 09:27 AM
rodbolt
Supreme Mariner
Join Date: Sep 2003
Location: Kitty Hawk NC
Posts: 13,747

Re: Tech Help Needed: 02 Four Stroke 225 Rough Idle

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your F225 symptoms are classic for a defective or sticking idle control motor, some manuals call it an ISC and some an IAC. what it does is control the air at idle speed.
it sounds like its either failing to close correctly.
you can bypass it and manually throttle the air. the air inlet for idle speed is the gray hose from the ISC on the port head to the rear plastic cover. you can also manually activate the ISC with the laptop to see if its working as the engine will react to a change in the ISC setting.
at 4000 RPM the IAC is set to 100 percent, if at idle it cannot reset to about 67 percent it does not idle correctly usually with a laptop it will show higher than normal intake pressure. in extreme cases it will acually set a manifold pressure sensor failure code even though its the ISC that failed. it happens.
the ISC can become mechanically stuck and the ECU cannot detect it. all the ECU sees is that electrically the ISC is connected.

 

[rodbolt]

Re: f200txr Is not idling or running well, getting a code 29

check the ISC with a temp gun after about 5-10 min of idling. if it goes over 200*F its most likly bad.
its not in the manual but its a field observation.
if you try to manually throttle it be very careful about the timing belt,it can bite.
not long ago I had an F225 that ran with a failed TPS for over 40 hours.
the man brought it in with a complaint of occasionally stalling when docking otherwise it ran fine.
theoretically thats not possible,however I ran the boat with the failed TPS,idled fine and turned 5300,but occasionally when shifting would die.
bot myself and the RTA at Yamaha agreed it could not happen yet I was running the boat while on the phone with the RTA.
goes to show why I harp on checking the entire system,not just replacing a part cause the ECU says its bad/out of range.
the symtoms of the above failure should have been 900 RPM idle and top speed cannot be reached.
on yours the same ECU settings should have been a 900 RPM idle and top speed cannot be reached.
another ISC symtom is it fails to chatter at engine shutdown. when you turn the key off the ECU goes into a shut down cycle. it kills the fuel pump,ign and once the engine rotation stops it resets the ISC for the next start cycle. thats the chatter you hear at engine shutdown.

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

LOL, Ya, that is what I said before you told me about the VST filters.. The ISC was hot. Really hot to the touch after just turning on the motor. LOL.. Also wish I found that post you did years ago.. It was have saved me a lot of time.

Also do the ECM EVER GO BAD???????????????????????????

As for purchasing the intake air pressure sensor. It is ok.. I will try to sell it on ebay during the busy spring boating season. Hope to get a little of my money back. I just consider that kind of spending my education to being stupid. LOL..

I just wish I read that post and also talked with the Yamaha Techs before making the purchase.

The great thing is that the techs will even fax you over a copy of parts to the manual. Great yamaha customer support.

Also what do you think about this book??? 2002 Marine Technical Guide?? Is there also a training manual that I can purchase or try to find??? I would like to have all the manuals for this motor.

I have never had to bring any of my motors to a repair shop. Also since the interent and the forums it has been a great help..

 

[mokaction]

Re: f200txr Is not idling or running well, getting a code 29

Special Thx to Rodbolt for helping me fix my motor. Replaced the ISC/IAC and also the intake air pressure sensor since I had that. Motor runs like a Yamaha F200 Very smooth.......

Rodbolt, hope you are having a great time out there in So America. Got to post your stories.

Your humble Student

Larry