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Oil Light on suzuki DF 115 2009'

Old 07-07-2018, 08:08 PM
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Default Oil Light on suzuki DF 115 2009'

Hello guys. I have a 2009' Suzuki 4 cycle DF115 with a problem.

The oil light came on Red and now stays red. No blinking and the engine does not go into limp mode. In fact the engine seems to run perfectly.

1. I reset the Oil service/clear code by turning ignition to run position and pressing the cut off switch 3x. I got the beep confirming reset. Did not help

2. I checked the oil level. It was towards the bottom of the low hash mark but not below it on the dipstick. I added oil to fill to the top hash mark. Did not help.



Here is the exact history: I ran the boat 4 hours yesterday and it ran perfectly. We docked for dinner and after re-starting the engine the Oil light came on as I increased engine RPM's. Engine still ran perfectly and did not enter limp mode.


This morning I did the computer reset by turning ignition key to run and pressing the cut-off button 3x. I got the confirmation beep. I checked oil level cold and found it just above the low hash mark on the dipstick. I filled it to the top hash mark.


Following all this tonight we ran the boat flawlessly for 4 hours and then parked again for dinner. I thought the problem was solved. I had no light and no problems. After an hour at the dinner dock I restarted the engine and the red oil light again lit as the RPM's climbed! I could turn it off at first by lowering the RPM's but by the time we got back to the home dock (about 20 minutes) the oil light was solid except for an occasional flicker when I varied RPM.


At no time did the engine operate in any manner except flawlessly. No limp mode. Engine ran at usual RPM without issue. Except for the oil pressure light being lit, you'd think nothing was wrong.


Now if I understand how the engine management system works, if the engine itself detected low oil pressure it would enter limp mode?


I am a little paranoid about this light. Any suggestions to check for an easy fix before I tow it 60 miles to a dealer? I suspect a wire loose rather than an actual mechanical problem such as bad oil pump or sender unit since the engine doesn't enter limp mode? Is this likely or am I just deluding myself? lol Thanks in advance for any help.
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Old 07-08-2018, 08:00 AM
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This may not related to your issue. I have a Zuke 175 and the oil light came on while idling last year. So I checked the oil and had fuel in my oil because of the VST fuel pump problem. I would look at suzukioutboardforum.com for an answer since that's all they discuss.
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Old 07-08-2018, 12:46 PM
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Originally Posted by Dago52 View Post
This may not related to your issue. I have a Zuke 175 and the oil light came on while idling last year. So I checked the oil and had fuel in my oil because of the VST fuel pump problem. I would look at suzukioutboardforum.com for an answer since that's all they discuss.

Thanks! This morning I went out to boat. There didn't seem to have any oil contamination. The light is *almost* continuously on now. I say almost because running around occasionally it will go out for awhile. It is not flickering-it is either on or off. Now I would say 90% of the time on. The light is now on independent of RPM's but sometimes varying it will make it go out for a short time. A few minutes later it is back on.


I checked the wiring harness (as much as I can) behind the gauge and jiggling it had no effect. The boats in the water and I am too old to hang over the motor to check things.


The motor itself runs perfect. Full power. Never once entered limp mode nor has any other lights come on (no Check engine light).

Nearest Suzuki dealer is a long drive from me. I think if I don't find someone who can provide a hint, I'm stuck trying to get it into a dealer. I still suspect a bad ground or short to the oil pressure gauge.
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Old 07-08-2018, 04:56 PM
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Originally Posted by pessemist View Post
Hello guys. I have a 2009' Suzuki 4 cycle DF115 with a problem.

The oil light came on Red and now stays red. No blinking and the engine does not go into limp mode. In fact the engine seems to run perfectly.

1. I reset the Oil service/clear code by turning ignition to run position and pressing the cut off switch 3x. I got the beep confirming reset. Did not help

2. I checked the oil level. It was towards the bottom of the low hash mark but not below it on the dipstick. I added oil to fill to the top hash mark. Did not help.



Here is the exact history: I ran the boat 4 hours yesterday and it ran perfectly. We docked for dinner and after re-starting the engine the Oil light came on as I increased engine RPM's. Engine still ran perfectly and did not enter limp mode.


This morning I did the computer reset by turning ignition key to run and pressing the cut-off button 3x. I got the confirmation beep. I checked oil level cold and found it just above the low hash mark on the dipstick. I filled it to the top hash mark.


Following all this tonight we ran the boat flawlessly for 4 hours and then parked again for dinner. I thought the problem was solved. I had no light and no problems. After an hour at the dinner dock I restarted the engine and the red oil light again lit as the RPM's climbed! I could turn it off at first by lowering the RPM's but by the time we got back to the home dock (about 20 minutes) the oil light was solid except for an occasional flicker when I varied RPM.


At no time did the engine operate in any manner except flawlessly. No limp mode. Engine ran at usual RPM without issue. Except for the oil pressure light being lit, you'd think nothing was wrong.


Now if I understand how the engine management system works, if the engine itself detected low oil pressure it would enter limp mode?


I am a little paranoid about this light. Any suggestions to check for an easy fix before I tow it 60 miles to a dealer? I suspect a wire loose rather than an actual mechanical problem such as bad oil pump or sender unit since the engine doesn't enter limp mode? Is this likely or am I just deluding myself? lol Thanks in advance for any help.
You are playing with fire, even though it is probably the oil pressure switch or wiring, if it is low oil pressure, it might be just above the limp home limit of around 12 psi, the light is dull so there is some form of voltage drop there. If the pressure reg spring broke in the oil pump it would make pressure but not much, most will be dumped back into the engine holder. You should check the oil pressure with a gauge to make sure it is okay.
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Old 07-08-2018, 06:32 PM
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Originally Posted by old battler View Post
You are playing with fire, even though it is probably the oil pressure switch or wiring, if it is low oil pressure, it might be just above the limp home limit of around 12 psi, the light is dull so there is some form of voltage drop there. If the pressure reg spring broke in the oil pump it would make pressure but not much, most will be dumped back into the engine holder. You should check the oil pressure with a gauge to make sure it is okay.

Thanks. Sounds reasonable. Due to the hassle of pulling the boat and driving to the repair ship, I ordered a new Oil pressure switch and I'll swap it out and see if that corrects the problem. If not, then off to the mechanic.

Does anyone have a picture of where on the engine the oil switch is located? I tried googling all over but can't seem to find any location for it. I'd like to have a feel for how to get to it before I'm actually out on the sand bar messing with it. At the dock it is really hard to get a look at the engine.
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Old 07-15-2018, 04:32 AM
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It was hard finding information on Suzuki DF model 90 & 115hp outboards on the net. Even a picture of the sensor location was difficult to locate. So in anticipation of someone else searching this forum for info here are a few things I learned.



1. The oil pressure sensor is on the starboard side near the top. You must remove 2 screws and the plastic air induction piece on that side to access it. It is under a rubber cap the wire leads into.


2. You can easily test the oil pressure switch with a resistance meter. When the engine is off the switch should ground out against the engine block. With the engine at idle the pressure closes the switch and it will not ground out. Remove wire from switch before testing. Test at a couple different RPM's. IE: Idle & 1800


3. A wiring ground fault problem is more common than actual oil pump failure. If your engine enters 'Limp mode' (1500rpm limit) than the oil pump is likely culprit. If not, than maybe bad sensor or wire fault but still test it.



Thanks for all the help. My problem turned out to be a wire fault grounding out the light and turning it on.
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