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F250 issues

D

D4120

New member
Hello,
I have a 2006 Yamaha F250 which has kicked my butt all season and I hope someone can help. Scanned it and reads a code 0007 but I haven’t been able to confirm what this code is. I also seem to have a sensor reading out of spec. I don’t want to keep throwing parts at it and I hope someone has an idea where to go next.
 
What is the motor doing / not doing?---Post the actual compression values here.----There may be issues with internal / water jacket corrosion on these.
 
Using an Ancel MR500 scanner. After about 30 seconds or so, the engine runs extremely rough and shakes. After it warms up a little it gets better but still not like it should. Also does not have power like it should.
Compression is 179-181.
I’m leaning towards the TPS or even the ECU. Looking at the values on the scanner, the voltage is low.
IMG_6230.jpeg
 
Have you physically tested the voltages with the motor not running? Both input and output?

The voltages appear to be a bit low but not excessively low.
 
Here are the readings:
Green/Red. .044
Green/Black. .044
Pink. .001
Brown 5.06
Pink/White. 0
Readings were the same with the throttle in neutral and WOT
 
There is no brown wire colour to the TPS. There should be an orange and a black wire.

Black being a ground and orange being the 5 volts.
 
Volts are normally measured using YDIS.

What is being reported does not agree with what the service manual calls for.
 
You are correct. It’s orange, not brown. It was dark when I first looked at it and it appeared brown.
With the numbers being off, any idea what could be the cause?
 
Your numbers don't seem to be agreeing what is displayed on your Ancel Gizmo. First I have heard of it. Is it intended to work with a Yamaha?
 
If you have five volts to the TPS then you should have about that amount coming out the TPS, depending upon the throttle position.
 
These units are compatible with Yamaha, Suzuki and Mercury.
Any recommendations on what I should try next? If I am losing voltage at the TPS, do you think that’s the issue? I’m pretty good at troubleshooting and repairing mechanical items but fall short on the electrical.
 
Losing voltage to the TPS or losing voltage from the TPS.

Are all of the wires and connections in good condition?
 
All of the connections are corrosion and damage free. I haven’t opened up the wiring harness and was trying to avoid doing so. I replaced the pulsar coil and timing belt and looked over the harness when doing so and didn’t see any issues.
 
With your scanner are you able to see the voltage changes as you move the throttle handle forward and aft?
 
The scanner does show voltage change when the throttle is moved. It will probably be this weekend before I can get back to it and I will let you know what I find.
I cannot thank you enough for your help.
 
Finally got some time and here are the volt
readings using a multi meter with the TPS harness plugged in. First numbers are idle second is WOT
Idle:
Pink. . .7 4.37
Pink/white. 2.8 4.68
Orange 5 5
Green 12.24 9.9
Green/red 11 12.26
 
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