JLG 340AJ Service Manual - Manual (Page 113)

SECTION 3 - CHASSIS & TURNTABLE
3121259 – JLG Lift – 3-73
3.17 KUBOTA ENGINE
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 Speed Sensor
The engine speed sensor is a variable reluctance sensor used
to measure engine speed by monitoring the flywheel teeth
while the engine is running.
Figure 3-51. Engine Oil Pressure Switch
+5V
270 Ohm
J1-15 Input
Engine Block
Ground
Ground Module
Engine Oil Pressure
Switch
Open for Normal Pressure
Closed for Low Pressure
Figure 3-52. Engine Oil Pressure Switch Schematic
+5V
RPM J1-16 Frequency Input
J7-5
J1-17
Ground Module
Variable Reluctance
Speed Sensor
98 Tooth
Flywheel
Figure 3-53. Engine Speed Sensor Schematic