mercury 175xri warning module

[eaglejax]

My 95 175XRI started the beep beep beep beeps a year ago. I don't have the oil injection hooked but it's not blocked off and all sensors and module are connected. That's the way it has been since I bought this boat and haven't had any issues. Was thinking that I might eventually go back to oil injection, I replaced the warning module, rotation sensor and while at it I replaced the temp sensor and temp switch. All has been good till now with oil alarm starting again. Just replaced the ECU recently with a Brucato ACU and the water/fuel sensor because it wasn't working when I tested it (no light or horn). I disconnected the rotation sensor but it did not help so I replaced the module again { $400.00 mistake). Disconnecting everything again and leaving the injection off. I can't check but I'm assuming the overheat warning horn will still sound but why can't I get a horn when I ground the tan lead to the water separator? The light comes on but warning horn. Also, is there a circuit in the ECU/ACU that might cause these problems and needs reprogramming?

 

[Dukedog]

you say tha oiler is not being used but module still has power? are all sensors still in place and still made up to tha module?.. do you still get tha "self test" beeps when key switch is rotated?

oiler stuff and acu/ecu aren't connected in any way.........

 

[eaglejax]

Yes I get the self test and with all wiring connected but when I ground the water sensor I get the light in the module but no horn and when engine starts cranking the oil alarm comes on. If I disconnect the oil rotation sensor only only, I still get the alarm. Leaving the tan/blue connected because I think that sends signal to the horn I get the alarm but If I disconnect the tan/blue from the module then there is no self test so I don't know if I have an overheat alarm or and no matter what I try I don't get a water/fuel alarm. If everything is connected and I disconnect the green only from the module to the switchbox I get the self test and no alarm comes on when cranking. I believe the green affects the safe mode circuit that's why I was wondering about the ECU programming. I asked brucato about that but they missed it and only sent me a troubleshooting guide for hard start and rough idle conditions

 

[Dukedog]

tha oiler stuff has no connection to tha over heat alarm other than sharing tha same buzzer.. tha ecu/acu has no connection to tha oil injection stuff either...
you are doin' somethin' i've never tried.. i have not and don't know of anyone that went to pre-mix and left power (purple) and signal wire (tan/blue) made up to harness?.. tha water and rotational signals can be non responsive or overly responsive.. Not very dependable for sending signal when its supposed to at any given time... this is common in tha early efi laser stuff...
any special reason you want to leave the power and alarm wire from module made up to tha harness wires?

 

[eaglejax]

Going to disconnect all. Have been grasping at straws trying to figure out what's going on. Left the purple, tan/blue connected for power and because even though the overheat and water sensors send warning signal when grounded I wasn't sure if horn signal for the water sensor might be triggered thru the oil module since the blue wire from the water module leads to it. I Left the green wire connected to the oil module because it leads thru the (coil to switchbox) harness connecting to the ECU plug, not switchbox as I said earlier and I was thinking that might be the signal for safe mode operation limiting the rpms. I had the same problem a couple years ago and replacing the module and rotation sensor eliminated it except for not getting the water warning horn to work but since then I've replaced the ECU and have only run in the water once and 7 or 8 times in the driveway. Problem just popped up 2 days ago.

 

[Dukedog]

with module and sensors all made up with power (purple) and alarm (tan/blue) made up on tha small term block its like its all still in "function" mode but may/may not be causin' a false narrative for what ever reason.. but not to worry 'bout tha over temp alarm.. oiler stuff and ecu/acu have absolutely nothin' to do with its function!..
PS, you will loose tha "test" beeps on key rotation with module not powered/gone...
also there is no "safe mode" with your motor.......gl.

 

[eaglejax]

Gotcha! Will disconnect and forget about it.
Thanks for your help