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cucol

code 81 / Troubleshoot switches

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cucol

I have posted about having a constant beeping on my 02 sunscape 325hp monsoon. Still have the beep. The only code i have is code 81 Injector Driver A or B Circuit High, Low or Open. Anyone have any ideas?? Also can anyone tell me what each switch is suppose to read as far as normally closed or normally open while boat is turned off. I need oil pressure switch, water temp, transmission temp, and neutral saftey. Please help.

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electricjohn

There are two circuits that supply the pulse to your fuel injectors. One is the blue circuit, the other is the green circuit. A red wire (+12 volt) is common to both. The ECM pulses both circuits to ground to supply the power to the injectors. It is evidently not seeing the current in one of these circuits at the proper range to which they are supposed to operate within. As far as the switches...open is the nornal position when the motor is running at normal conditions. Some switches (such as overtemperature) do not change state unless there is a problem, motor running or not.

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electricjohn

My Monsoon does not have a water temperature switch, only a temperature sender for the gauge and a temperature sensor for the ECM. Where did you get the verbage on what a code 81 is?

Edited by electricjohn

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cucol

UPDATE Thumbup.gif Figured out problem, it was a bad ecm and ignition module. I am back in bussiness. Thanks All for the help.

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