Toro Groundsmaster 3280-D Service Manual page 287

Testing the Engine Oil Pressure Switch
Groundsmaster ® 3280-D/3320
05138SL Rev B
If the oil pressure indicator light is illuminated with the engine
running, shut off the engine immediately. Check the indicator light,
circuit wiring, pressure switch, and engine lubrication system to
identify the cause of the illuminated indicator light.
Note: Refer to engine service manual for information regarding engine
lubrication system and testing.
1. Park the machine on a level surface, lower the cutting deck, set the parking
brake, and shut off the engine.
2. Turn the key switch to the O
control panel should be illuminated.
3. If the indicator light is not illuminated:
A. Unlatch the hood and raise it.
B. Locate the engine oil pressure switch on the engine and disconnect the
wire harness connector from the switch.
C. Connect a multimeter (ohms setting) across the switch harness connector
terminals to check the continuity of the switch:
D. With the engine shut off, there should be no continuity between the
switch harness terminals.
E. With the engine running, there should be continuity between the
switch harness terminals.
4. If the testing determines that the oil pressure switch is not operating correctly,
check the pressure switch and/or pressure switch harness for continuity.
Repair or replace the components as necessary.
5. If the switch testing is correct and the circuit problem still exists, check the
machine wire harness; refer to the Electrical Schematics and Wire Harness
Drawings/Diagrams in
6. After you complete the oil pressure switch testing, connect the wire harness
connector to the oil pressure switch.
7. Lower the hood and secure it with the latches.
IMPORTANT
position. The oil pressure indicator light on the
N
Appendix A (page A–1).
Page 6–59 Electrical System: Testing the Electrical Components