Engine System, Diesel 229Service Manual – CS7000
Low Oil Pressure Shutdown
Here is how the low oil pressure shutdown works. The main machine controller sends 12 V out connector J3
pin number 9 to the APECS governor controller and the oil pressure switch. When there is oil pressure, the
switch connects the voltage back as an “engine run signal” to the main machine controller connector J7 pin
number 4. Once the main machine controller has seen that the engine is running, it continues to monitor
that voltage. If engine oil pressure is lost, the “engine run signal” to the main machine controller will also be
“lost” (voltage drops from 12v to 0v). In response, the main machine controller sets an oil pressure fault,
displays it on the control panel and immediately removes the power supply going out connector J3 pin
number 9 from the APECS 3000 Governor controller, which causes the engine to shut down.
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