SYSTEM / Electrical System Engine Oil Low Pressure Indicator Purpose: It lights the engine oil low pressure indicator on the monitor unit in order to inform the pressure lowering in engine lubricant oil to the operator. Operation: 1. When the engine lubricant oil pressure becomes lower than the normal range, the engine oil pressure switch is grounded. 2. When the engine oil pressure switch is grounded, the monitor unit lights the engine oil low pressure indicator.
3. When the engine lubricant oil pressure returns to the normal range, the engine oil pressure switch is disconnected from the ground. 4. When the engine oil pressure switch is disconnected form the ground, the monitor unit goes off the engine oil pressure indicator.
Monitor Unit
NOTE: The monitor unit lights the stop indicator as well as the engine oil low pressure indicator at the same time.
Engine Engine Oil Pressure Switch
Engine Oil Low Pressure Indicator
1A-8
Stop Indicator
T4FG-02-03-020
T2-3-44
