155Service Manual – CS7010™ 28 - Engine System, Diesel
Engine starter control
The Main Machine Controller controls the starter solenoid on the engine, based on the input from the keys
witch.
To get the engine starter to engage, the key switch is held in the start position which supplies 36 volts to the
main machine controller connector J1 pin 21. This is the start input request. The main machine controller
receives a 12 V supply on connector J1 pin 13 from the engine starter battery. It uses this voltage supply to
send voltage out connector J1 pin 9 to the starter solenoid.
Fuel pump control
The main machine controller uses the same 12 V battery supply from connector J3 pin number 23 to operate
the fuel pump. When the key is turned on, 36 volts is supplied to the main machine controller connector J7
pin number 13. In response, the controller sends voltage out connector J3 pin number 9 to the oil pressure
switch. As the engine cranks oil pressure builds up causing the oil pressure switch to close and supply
voltage to the fuel pump. The other side of the fuel pump is connected to ground. If oil pressure is lost, the oil
pressure switch will open removing power from the fuel pump.
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