'92 Yamaha 150 buzzer problem

stansmith · #1 June 8th, 2004, 10:34 AM

The low oil warning buzzer comes on immediately when the ignition is switched on. There is of course sufficient oil in the integral and remote tanks. The tach guage flashes all three arrows and the buzzer sounds continously. Here are the steps I have taken so far: I have an extra Yamaha motor on another boat so I am able to swap out parts for troubleshooting. (I know - it's the rookie way of trying to fix the problem, but that's because I am a rookie) I changed all four wiring harnesses and I changed both the integrated and the remote oil level sensors. I changed the remote oil pump and

checked the filter for obstructions. I inspected the wiring and all of the grounds that I could see (even wire brushed the grounds on the block)

Additionally - I have inspected every splice and fuse that I could reach,--still the same problem. I have read the clymer manual cover to cover and must be missing something. By the way - With the engine running, if I disconnect the blue wire at the connection where it goes into the remote oil pump -the buzzer quits sounding and the guage reads normal. The motor operates normally with the exception that the remote pump is disconnected. If I plug the blue wire back in -the buzzer sounds. Of course I do not wish to operate the motor w/o an operable remote pump - afraid I might slip up and let the integral tank run too low and burn the motor. My frustration meter is pegged! I read all of the posts that seemed related and am now wondering if this could be a trim sender problem and how would I check that. Thanks alot in advance for any help.

Stan

Ray Neudecker · #2 June 8th, 2004, 02:57 PM

Try checking the emergency oil pump switch. It is located on the left upper side of the box with the CDI in it on the rear of the motor. I am not sure they had the trim sender tied in to the oil system on that model. Swapping parts where available is a lot easier than trying to understand the electronics on a Yamaha. Thankfully the failure rate is low on them.

stansmith · #3 June 8th, 2004, 04:42 PM

OK, Thanks for the suggestion on the emergency switch. I did'nt think to check that out. I can't get to my donor motor until tommorrow morning - but I will pull the switch off and see if that works! I will post back and let you know. I will continue to check this site tonight in case you guys have any more suggetions. Thanks again!

Stan

rodbolt · #4 June 9th, 2004, 04:08 AM

hello

all the emergency switch does is complete the ghround signal for remote pump run. I would suspect the oil contoller or ground. the 3 bars flashing are telling you a system malfunction has occured. something broke and its trying to tell you it broke. test the remote oil switch and wiring back to the controller. if the contoller does not get the correct signal from the remote tank or the engine tank at the same time it will assume a malfunction occured. IE the remote tank has oil and the engine tank is low would indicate a malfunction you would have 3 bars flashing and an alarm.

Ill try to be more specific later.

horse is screaming. gotta go before she starves

stansmith · #5 June 9th, 2004, 04:47 AM

Thanks for the reply rodbolt! I will check the switch and the wiring back to the computer. (On this model, the oil controller is integrated into the CDI) Do you think it might be the computer malfunctioning? A friend who is much less knowledgeable than you guys say's Yamaha computers are nearly bulletproof. I only know that I am completely stumped. Thanks again and I will continue to check this page for any other suggestions. I will post back on results of the switch test.

stan

rodbolt · #6 June 9th, 2004, 03:33 PM

hello

that is about the largest failure of yamaha computers. the oil control circuits will fry sometimes.

usually due to faulty pump wiring.

do a search for the yamaha oil system. there is a nice trouble shooting guide on here someplace. its rather long and detailed but its a good one

good luck and keep posting

stansmith · #7 June 9th, 2004, 06:03 PM

Hello all,

ok, guys thanks for all of the great feedback. I just finished installing a new emergency oil switch (The one located just above the computer) Unfortunately - no change - still sounding the alarm. Next I replaced the computer (remember I have a donor motor that is working properly) still no change. This afternoon I decided to take the boat out for a spin to see if I could learn anything else. Before I left the dock I turned the ignition switch on resulting in the alarm sounding. I walked back and plugged and unplugged the blue wire (at the remote oil pump) a couple of times and the alarm stopped buzzing. With all wiries hooked up properly, I took the boat out. When the integrated tank level reached the low mark - the alarm sounded and the RPM reduced to 2000 -just like it is supposed to. I toggled the emergency switch because evidently the remote pump did not pump any oil to the integrated tank. As I toggled the switch, I had my other hand on the remote pump - nothing. Bear in mind that it is a new pump and I have troubleshooted everthing with the exception of the trim sensor. Could a faulty trim sensor be causing me all of this grief? With my luck the answer is yes considering that it looks to be the hardest part to get to. I am nearly ready to throw in the towel. Thanks to all of you for your help - It is very much appreciated. In the meanwhile I will do the search that rodbolt suggested.

Stan

stansmith · #8 June 10th, 2004, 06:40 PM

Hello all,

Thanks Mr. Neudecker and rodbolt for your assistance. I have fixed the problem!! I waited to the last minute and replaced the engine wiring harness.(The one that is about 2 feet long and runs from the starboard side to the port side of the engine) Replacing this harness solved the alarm problem detailed above.(Of course it was the last harness swapped out - I had already swapped out everything else!) Thankfully - I had a donor motor and your technical expertise to help me. Thanks again and God Bless.

Stan