Caterpillar Engine Troubleshooting LTC Repairwc_tx000476gb.fm 866.10 Checking Oil Pressure and Coolant Temperature SwitchesSee Graphic: wc_gr0024806.10.1 If the engine starts but shuts down after approximately 10 seconds,check the following.6.10.2 Check the engine oil level and add oil if necessary. Also check thecoolant temperature. If the coolant temperature is high, allow theengine to cool. Flush and fill the radiator with the correct coolant.6.10.3 Check the oil pressure switch (a) and coolant temperature switch (b)wiring. If the wiring of either switch is shorted to ground, the engine willshut down.Be sure the switches are functioning—check each for continuity. Theoil pressure switch is a normally closed (NC) switch that should havecontinuity when the engine is off. If the switch has no continuity whenthe engine is off, the switch is faulty; replace it.The high coolant temperature switch is a normally open (NO) switch.This switch should have no continuity when the engine is off. If thisswitch has continuity when the engine is off, it has shorted and is faulty;replace it.
