Yamaha F115, ISC test ?

[loyoki]

Hi,
I would like to test my ISC on my Yam F115.
It is impossible to have a Yamaha specialist to come at harbor with a the laptop and itsYam software.
So, is there another way to test ISC if it is faulty or not ? With a voltmeter ?
Many thanks
Lo?c

 

[jeffersondodson561]

Re: Yamaha F115, ISC test ?

Their is a way to test the ISC valve with the software but I have never used it and if I remember it takes about 20-30 minutes to complete, what are your symptoms?

 

[SparkieBoat]

Re: Yamaha F115, ISC test ?

I had an ISC problem with my 2003 F115. It started to cause my ECU to freak out ...What I did first was to get a copy of the yamaha diagnostic program and made my own cable (for $30) Cause I could not order the Yammy cable cause they are back ordered for over 6 months and cost over $300 ridiculously stupid price. But the resolution to my problem was multiple, first I cleaned out the VST chamber and the screen on the bottom of the high pressure fuel pump in there, and changed all other filters and added one in between the low pressure fuel pump and the VST, (they added these from the factory starting on 07 I think). second I adjusted the TPS. third I checked the 5v reference at each sensor. lastly I touched the ISC valve body after 5 mins of run time, it was very hot. this indicated that it was probably stuck (seems to be a common problem from what I hear) I soaked it in sea foam for 2 days then reinstalled it..works like a champ now..they are very pricey or I would have just got a new one. when they over heat from being stuck it also can cause problems in your ECU ($1000) so you want to fix this problem ASAP. I am not sure of any way to test it other than listening for the ISC rattle just after shut down. I made a video of mine here .. http://www.youtube.com/watch?v=RKGDf7zgP80 All though I heard it resetting (2 second rattle) it was over heating and stuck...my engine is running tremendously well now. if you are interested I will link you to the post about making your own cable.

 

[loyoki]

Re: Yamaha F115, ISC test ?

Thanks a lot
Symptoms are multiple: engine starts after 2s or 3s starter at 900rpm (700rpm before, started immediately), idle problems ( not stable and sometimes stops) and now a new problem: randomly engine starts with ignition advance (typical engine knocks) with smoke and idle not stable and dies.
At WOT no problems
I have checked and clean all other sensors, TPS with good voltage, VST...
SparkieBoat: I am in France and I don't know sea foam: is it like Acetone or Methylated spirit ?
Yes I am very interested with your post about making the cable: loyoki@free.fr
Many thanks
Lo?c

 

[SparkieBoat]

Re: Yamaha F115, ISC test ?

http://www.yamahaoutboardparts.com/forum2/yamaha-diagnoistic-software-th15900.html
http://www.yamahaoutboardparts.com/...skipping-would-not-shut-off-once-th15590.html

 

[jeffersondodson561]

Re: Yamaha F115, ISC test ?

smoke and idle not stable and dies.

How do you keep you outboard trimmed when not in use? What is fuel pressure at the VST, does reference hose drop fuel pressure at lower rpms?

 

[loyoki]

Re: Yamaha F115, ISC test ?

Many thanks SparkieBoat, where did you find the software ?

How do you keep you outboard trimmed when not in use? => Sorry I don't understand ?
What is fuel pressure at the VST, does reference hose drop fuel pressure at lower rpms? => Why ?

My problems are not new and were at the beginning random problems but now it is every time.
Rodbolt told me when your engine starts not immediately but after 3 or more seconds at a high RPM (900-1000), it is because ECU has a code error, so could fuel pressure uploads a code error ?
At other RPRM my engine runs fine, even at 5600 RPM, so It can't be injectors or fuel issue I think, it is an electrical problem.
Why my engine starts with ignition advance ? It is an order of ECU, so why ?
Advised by SparkieBoat, I listen my F115 when I shut down it , I do not hear any noise, no rattle.
Many thanks for your help.

 

[jeffersondodson561]

Re: Yamaha F115, ISC test ?

Do you mean the timing is locked at a certain point when you start it up, is it at 10 degrees BTDC?
You should keep your engines trimmed out/up in the trailor postion, the reason is since the cylinders are stacked perpindicular to the ground, this can allow puddled oil to be trapped behind the piston skirt, causing a plume of smoke at start up (if left in the fully down position). Your fuel pressure is calculated by a mechanical means (fuel pressure regulator). The ECM needs all mechanical devices to be working in order to make the proper calculations. Too high fuel pressure at idle (about 1-3lbs) cause cause the ECM to make calculations that can cause a rich condition.

you have a PM...

 

[loyoki]

Re: Yamaha F115, ISC test ?

Many thanks for your help

Do you mean the timing is locked at a certain point when you start it up, is it at 10 degrees BTDC? => YES
You should keep your engines trimmed out/up in the trailor postion, the reason is since the cylinders are stacked perpindicular to the ground, this can allow puddled oil to be trapped behind the piston skirt, causing a plume of smoke at start up (if left in the fully down position) => not at start up but when engine stalls and iddle decreses to 600-500 RPM with clatter noise.
Your fuel pressure is calculated by a mechanical means (fuel pressure regulator). The ECM needs all mechanical devices to be working in order to make the proper calculations. Too high fuel pressure at idle (about 1-3lbs) cause cause the ECM to make calculations that can cause a rich condition.Could I test the fuel pressure regulator ?

you have a PM...What is PM ?Perfect Motor ?;o)

 

[99yam40]

Re: Yamaha F115, ISC test ?

PM = private message

Look at the top right of the page, next to your user name, click on Notifications and then inbox

 

[jeffersondodson561]

Re: Yamaha F115, ISC test ?

If your timing is locked in at 10 degrees BTDC, means a sensor (possibly TPS, ECT, MAP etc.) is reporting back to the ECM in, "out of workable calculations" value. Meaning, faulty sensor, no 5 volt reference, bad return path to the ECM etc. ...Would possilby be easier with the software to monitor engine values.
You could test the regulator by pulling vacuum on the reference hose (smallest hose on the regulator) and fuel pressure should drop. But you need to address the sensor problem first.

 

[loyoki]

Re: Yamaha F115, ISC test ?

PM = private message

Look at the top right of the page, next to your user name, click on Notifications and then inbox

PM read and answered
Thanks again for your help.

 

[twirk]

Re: Yamaha F115, ISC test ?

I had an ISC problem with my 2003 F115. It started to cause my ECU to freak out ...What I did first was to get a copy of the yamaha diagnostic program and made my own cable (for $30) Cause I could not order the Yammy cable cause they are back ordered for over 6 months and cost over $300 ridiculously stupid price. But the resolution to my problem was multiple, first I cleaned out the VST chamber and the screen on the bottom of the high pressure fuel pump in there, and changed all other filters and added one in between the low pressure fuel pump and the VST, (they added these from the factory starting on 07 I think). second I adjusted the TPS. third I checked the 5v reference at each sensor. lastly I touched the ISC valve body after 5 mins of run time, it was very hot. this indicated that it was probably stuck (seems to be a common problem from what I hear) I soaked it in sea foam for 2 days then reinstalled it..works like a champ now..they are very pricey or I would have just got a new one. when they over heat from being stuck it also can cause problems in your ECU ($1000) so you want to fix this problem ASAP. I am not sure of any way to test it other than listening for the ISC rattle just after shut down. I made a video of mine here .. 2003 F115 ISC valve rattle after shut down. - YouTube All though I heard it resetting (2 second rattle) it was over heating and stuck...my engine is running tremendously well now. if you are interested I will link you to the post about making your own cable.

I know this thread is old, but I would be interested in your instructions on making my own cable. I am experiencing the same issues as loyoki

 

[twirk]

Re: Yamaha F115, ISC test ?

Many thanks SparkieBoat, where did you find the software ?

My problems are not new and were at the beginning random problems but now it is every time.
Rodbolt told me when your engine starts not immediately but after 3 or more seconds at a high RPM (900-1000), it is because ECU has a code error, so could fuel pressure uploads a code error ?
At other RPRM my engine runs fine, even at 5600 RPM, so It can't be injectors or fuel issue I think, it is an electrical problem.
Why my engine starts with ignition advance ? It is an order of ECU, so why ?
Advised by SparkieBoat, I listen my F115 when I shut down it , I do not hear any noise, no rattle.
Many thanks for your help.

Loyoki. Did you ever fix this issue? I am experiencing the same issues.

The chatter after shutdown is sometimes there and sometimes not.

 

[bbakernbay]

Re: Yamaha F115, ISC test ?

I had an ISC problem with my 2003 F115. It started to cause my ECU to freak out ...What I did first was to get a copy of the yamaha diagnostic program and made my own cable (for $30) Cause I could not order the Yammy cable cause they are back ordered for over 6 months and cost over $300 ridiculously stupid price. But the resolution to my problem was multiple, first I cleaned out the VST chamber and the screen on the bottom of the high pressure fuel pump in there, and changed all other filters and added one in between the low pressure fuel pump and the VST, (they added these from the factory starting on 07 I think). second I adjusted the TPS. third I checked the 5v reference at each sensor. lastly I touched the ISC valve body after 5 mins of run time, it was very hot. this indicated that it was probably stuck (seems to be a common problem from what I hear) I soaked it in sea foam for 2 days then reinstalled it..works like a champ now..they are very pricey or I would have just got a new one. when they over heat from being stuck it also can cause problems in your ECU ($1000) so you want to fix this problem ASAP. I am not sure of any way to test it other than listening for the ISC rattle just after shut down. I made a video of mine here .. http://www.youtube.com/watch?v=RKGDf7zgP80 All though I heard it resetting (2 second rattle) it was over heating and stuck...my engine is running tremendously well now. if you are interested I will link you to the post about making your own cable.

Did you just dunk the ISC in a jar full of Seafoam? Any other tips on cleaning this valve. They want $260 for 6C5-13105-01-00 ICV, 10 times price of similar for a car.

I have the Yamaha Diagnostic Software and have hooked it up to my laptop with no error codes showing. Apparently the ISC can be tested using YDS, did you do that?

 

[bbakernbay]

Just bought a ISC/IAC on eBay for $55 and awaiting delivery.

I bought some IAC cleaner at Auto Zone and will try and clean the pintle operating end but trying to figure out how I can move it during the cleaning procedure.

I read elsewhere that someone did this with a 12 volt battery and a capacitor but no details given.

Has anyone an idea on moving the valve on the workbench so as to ensure thorough cleaning?