Coolant Sensor; Engine Oil Pressure Switch - JLG H340AJ Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE

Coolant Sensor

The coolant sensor operates by providing variable resistance
to ground based on coolant temperature.
Figure 3-33. Engine Coolant Sensor
Engine Coolant
Temperature Sensor
1
2
Engine Block
Ground
Figure 3-34. Engine Coolant Sensor Schematic
3-56
MAE15950
Ground Module
+5V
270 Ohm
J1-14 Input

Engine Oil Pressure Switch

The engine oil pressure switch monitors oil pressure and sends
an electronic message to the control system. This is accom-
plished by creating an open electrical circuit for normal oil
pressure and a closed electrical circuit for low pressure.
Engine Oil Pressure
Switch
Open for Normal Pressure
Closed for Low Pressure
Engine Block
Ground
Figure 3-35. Engine Oil Pressure Switch Schematic
Table 3-4. Engine Oil Pressure Switch Conditions
Oil Pressure
Oil Pressure
Switch
0 - 7 psi (0 - 0.48 Bar) Closed
Greater than 7 psi (0.48 Bar)
Ground Module
+5V
270 Ohm
J1-15 Input
Voltage at Input
0V
Open 5V
3121634