DF115 with 3-2 error code

[MoeMuny]

Just wondering if anyone here has seen this issue?
Outboard was running fine. it had been about 2 year since it had run and when getting it ready for a trip I found the fuel pump had died. I put in a new pump and ran it, Life was good. Then about 40 miles into it. I stopped the boat for a bit and when I tried to start it, it would not start and started flashing code 3-2.

Code 3-2 ends up being for the Map sensor. I have tried clearing the pressure detect passage and installed a new map sensor but still getting the code.

The code is instant, as in the second you turn the key on I get the code and the engine will not start...

I checked compression just to make sure, and I have good compression on all cylinders.

Any help is greatly appreciated!

Thanks in advance!!!

[jolley55]

I have been there. I have 2 that did same thing. They run well with the cowling off. Do they sound louder than when new?

Just wondering if anyone here has seen this issue?
Outboard was running fine. it had been about 2 year since it had run and when getting it ready for a trip I found the fuel pump had died. I put in a new pump and ran it, Life was good. Then about 40 miles into it. I stopped the boat for a bit and when I tried to start it, it would not start and started flashing code 3-2.

Code 3-2 ends up being for the Map sensor. I have tried clearing the pressure detect passage and installed a new map sensor but still getting the code.

The code is instant, as in the second you turn the key on I get the code and the engine will not start...

I checked compression just to make sure, and I have good compression on all cylinders.

Any help is greatly appreciated!

Thanks in advance!!!

[catacom225]

Df115

Check the Advance Forun search bar on engine holder corosine

[redlowrey]

Usually when the engine holder is eaten out, the engine will start and run, then start running rough because the exhaust gas is being drawn in through the throttle plate. Ounce this happens manifold vacuum drops and signal line voltage increases making the engine run rich. If it is the problem taking the cowling off will let it run. It should only log that code when cranking the engine because the ecu is looking for a change in map sensor signal voltage. Disconnect the battery for ten seconds then hook it back up, turn the key on and see if it still comes up with that code.

[Ccscorpion200]

Did you ever fix your 3-2 error code? I got the same error, motor runs but idle rough. It's said that it's a map sensor 2 code. I cannot find that sensor.

[redlowrey]

The map sensor has two functions, one it measures barometric pressure, and two, it measures the changing manifold pressure with different loads. When you take the cowling off you will see it on the inlet manifold, remove it and make sure the little hole in the manifold is not blocked with carbon the same with the sensor.

[Ccscorpion200]

I took it out and everything look clean, no corrosion, not even dirty. When I run the motor, the the hose that come out of the manifold has good vacuum. My gauge will beep as soon as you put power to the motor. Getting a repair manual. What else can I check? Thanks for the help

[redlowrey]

If you want to fix this your self you will need a digital multimeter, a vacuum pump, and vacuum gage. Remove the map sensor and plug the manifold, connect the voltmeter red lead to the to the white wire on the sensor and the black wire to ground, connect the vacuum pump to the sensor with a tapered plug and push it into the hole, turn the key on and you should see around four volts. Slowly pump the vacuum pump and you should see the voltage slowly going down, when you get to around 600mm hg it should be around one volt. Remember any engine that uses a map sensor, if for any reason it has a mechanical problem or an electrical problem that effects manifold vacuum it will change the signal line voltage to the rich end of the scale. Because people hammer these little engines they suffer with tight tappets and camshaft problems.

[Ccscorpion200]

Will try that after the weekend, still waiting on the service manual. Will let you know what I find.

[Ccscorpion200]

Got a chance to look at motor today. Follow your instructions and measured about 4.4v on white line and pull a vacuum on the map sensor down to around 600mmHg and got around 1v on map sensor. Even start the motor with it at 1v and still no changes. 3-2 code still. Check corrosion on holder and all look good, not even a rust on those plug. Mess with the idol screw and that didn't help either. Will look further when I get my repair manual in.

[catacom225]

3-2 error

To adjust the air idle you will need to take it to over 1000 RPM, an alarm or a beep should sound , with a tachometer attached bring rpm back down to correct rpm [ 650 +- 25 i think ] then throttle engine up to over 1000rpm to cancel alarm . Had a similar problem with a 140 3-2 after checking everything that could be checked i changed IAC reset rpm, code disappeared

[redlowrey]

That test proves that the map sensor is functioning properly, if the idle speed is to low manifold vacuum will be low that would turn the check engine light on. is the light flashing a code when you first turn the key on, or doe's it come on when the engine is running. When the engine is cold and you turn the key on the ecu is looking at engine temp, map sensor, exhaust temp, air in let temp volts to calculate injector pulse width time and iac air bypass for a stable idle if the iac doe's not bypass enough air the engine will stumble and that will bring the light on.

[redlowrey]

I was just reading your post again, if the motor was running and you had one volt on the signal line the light should not have come on, so it must be coming on when you turn the key on. That code should only come on if the ecu did not see a change in the signal line voltage when cranking and when it starts. When it is a corrosion problem the engine will run good with the cowl off, and bad when it is on the reason, with the cowl on exhaust gas will be drawn in through the throttle plate a drop in manifold vacuum, signal line voltage go's high engine runs rich.

[redlowrey]

I also forgot to add, make sure you have got one volt on pin twenty nine at the ecu.

[Ccscorpion200]

The code will come on as soon as you turn on the key. Without the motor started. I will try that catacom225. I did take the IAC and cleaned it. Nothing look bad in it. My manual should be in today. Will do more checking. Thanks for the help so far.