A Series Diesel Engine Electrical System 143
Fuel Shutoff Valve – Check
Note : Check all connections for loose or corroded
connections for broken wires.
Remove the valve. Ground the valve and connect 12
volts DC to the terminal and observe plunger
movement.
Oil Pressure Switch and Temperature
Sensor
When diagnosing problems with either the pressure
switch or the temperature sensor, check for loose or
corroded connections and for broken wires.
Oil Pressure Switch - Check
Remove the pressure switch, install a gauge, start the
engine and measure oil pressure. Minimum oil
pressure:
Idle 147 kPa [21PSI]
Full Speed 294 kPa [42 PSI]
Note : The pressure switch is set to actuate when oil
pressure drops to 98 kPa [14 PSI].
Temperature Sensor – Check
Check for continuity.
Voltage : DC 12 V
Temperature 54.4 ℃ 110 ℃
Resistance 560~716Ω 72.1~81.8Ω
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