2004 Yamaha 150 VMAX OIL PROBLEM

[perryk123]

Hey all,

have an 04 Vmax 150 Carb on a 19 ft Startos Fish+ski. Had it on the water several times this year with same problem. The remote tank is not transfering oil to the engine tank. It will transfer from the emergency/manual switch. The pump works wen i put staright 12v. But nothing when the key on, and the engine tank low. I can run it for 40 min after manually filling the tank and it gets low and throws the alarm. The motor is oiling good and runs like it should. Just no oil being delivered. I have chased down every single connection and unplugged and grease all the plugs with the same color wires, even the main engine harness thinking it might be corrosion or bad contact etc. I have a good ground at the engine oil sedner when touch the black+black-red my test light comes on, but none of the other wires will turn the test light on(dont know if they should). I have checked all the lines for any kincks or anything suspicious, and all seams good. I have tried to remove the oil sending unit out from the remote tank, and when I did I did NOT get an alarm. I think the alarm should have come on seeing as the sender was all the way down. Do the two problems maybe coinside???

It seams like a minor issue but i cant pinpoint what or were to look next.

Please help.

 

[cousinabe]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

sounds like you have a bad remote tank float switch in that it is not sending ground on the black/red wire.
Make sure you have good ground path on black/red wire when oil tank is more than 1/2 full.

http://forums.iboats.com/showthread.php?t=302031

 

[k4ubr]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

i have seen the harness go bad too.. i would check that you have good wires. us a ohm meter

 

[rodbolt]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

the reason for the lack of an audible alarm is your lack of knowledge.
you should have noticed a center bar on the tach blinking though.
do a forum search on yamaha oil switches and you will find I have covered it.
if your high end bass boat was rigged without the high end Yamaha digital gauges then it means you have aftermarket stuff which wont indicate the correct information.
not your fault .
I am in a good mood so let me type a bit, disregaurd typos please.
your precision blend system has several things going on at once.
the engine tank contains 3 switchs and a water trap.
the top switch,blue/white to black shuts off the automatic transfer,the middle switch,blue/green to black turns on the auto transfer, the bottom blue/red to black sets the audible for low oil and sets the engine into RPM reduction.
now on to the remote tank.
it contains a simple on off switch.
if the tank has enough oil for auto transfer the switch is closed(continuity) if not or the switch is bad auto transfer is inhibited but emergency still works.
at key on the brown wire at the remote tank is 12V+ the blue is the ground path and is completed by either the ECU based on switch positions(commands) from the engine tank or via the toggle switch for emergency transfer.
a clogged filter at the remote tank may allow oil to be consumed faster from the engine tank than the transfer pump can supply.
quick checks
at the remote connector check blak(harness side) to engine block for continuity, check continuity black to black red (switch side) check 12V to block key on engine off.
engine tank, unplug the oil tank connector, check oil tank side with tank full blue/white to black,continuity, cut the tie strap and remove the water trap drain the oil into a clean container, when the level goes below the lower tank mark check the blue green to black, should have continuity.
another check, engine tank low, remote full,key on,the transfer pump will run
180 seconds. in that time frame check the blue pump wire to ground for continuity.
remember if the black and black/red wires have lost contact the ECU "sees" it as low remote level and auto transfer is inhibited.
NEVER remove the engine tank screen/switch assy without first DRAINING the engine tank and ALWAYS retrieve and replace the screen to tank seal.
failure to follow this can lead to catastrophic engine failure.

 

[perryk123]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

rodbolt,
thanks for the info and your time. So I went back to the lake. I dont have any fancy digital gauges. Plain old Stratos tach. I drained the engine tank as you mentioned. Black and black/red had cont. when empty alarm was on. Had the sender out, and pushed it manually to half way(alarm went off), checked for cont. between bluegreen andd black GOT NOTHIN, pushed it all the way up, check for cont. between bluewhite and black GOT NOTHIN. So i ordered a new sender. got it in and went to the boat thinking all was about to be solved, pluged it up and tried the same tests for continuaty got the sasme results. By accident i tried to see if there was power going from the motor to the oil pump and grounded the Blue wire on the harness that comes from the motor going to remote tank and that kicked the oil pump on but would not shut it off. I didnt have a multimeter to check the actual volts but will get one and check. Also on the harness the remote tank plugs into on the other side there is a transfer of wire color to a yellow that runs to the ecu, do i need to check it as a powerr source or not mess with it? I saw you mentioned in several forums the engine needs to be on for the pump to oil, is that for older models, do i need to do that, or is key on power good.

Thanks again.

 

[rodbolt]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

the brown wire at the remote tank is always hot when the key is on. the wire color changes at the splice in the main 10 pin harness just aft of the engine connector not the ECU.
the ECU controls the ground path (blue wire from remote tank) via signals from either the manual overide switch or the on/off switchs in the engine oil tank.
for normal automatic transfer your engine must be running.
if the engine tank is low and the remote tank is full the pump will turn on for 180 seconds to fill the engine tank at key on engine off .

 

[perryk123]

Re: 2004 Yamaha 150 VMAX OIL PROBLEM

rodbolt,

i went back to the boat to check what you mentioned. I have power on the sender from the black to blackred, and nothing else. I tried testing bluewhite to black when tank is full got nothing. Drained tank to test bluegreen to black got nothing. Alarm still works when oil level get low, i have the key on engine off. I bought a multimeter this wekend but i could not find any wires going into the main harness. There is a 4 wire cluster that runs from the remote oil tank to the ecu. is this the harness i should be testing for correct voltage??? or is it the main engine harness???

Thanks