Johnson system check no oil light stays on with engine not running,VRO pump is good

[rocn7roc]

Hi need advise my 97 150 Johnson developed a problem. the no oil light stays on without engine running when you turn key on , The system check goes through it sequence as it should then oil light stays on engine running or not. I have hooked aux tank with oil for trouble shooting. VRO pump is working pumping fuel and oil. I have unplugged VRO 4 wire plug and light still stays on. I have unhooked oil tank 2 wire and light still stays on. Next I will check tan/yellow wire for short, then people have said if that not shorted then the tach with system check must be bad. Do these go bad. Help I am retired and can't afford taking it in. I have 30 years of mechanics under my belt and the VRO was replace a few years ago Thanks Mike

 

[dingbat]

I assume the system works off a N/O relay on the pump side. Pull the connector off fuel pump and put a meter across tan and yellow on the pump side. You should see that status change. if not, you have a bad fuel pump or fuel pump relay

 

[rocn7roc]

No it works of the crankcase pulses,uses VRO pump system counts the pulses.My light stays on without engine running the rest of fault light go out as they should thanks Mike

 

[dingbat]

No it works of the crankcase pulses,uses VRO pump system counts the pulses.

That's only 1/2 the circuit.

The alarm circuit monitors pump operation via a pulse counter and Oil flow via an imbedded reed switch. No pulse or no flow triggers the alarm.

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