8/24/2023 0 Comments Cummins isx coolant temp sensor![]() Cooling fan ran on high speed the whole time. Low signal voltage detected at engine coolant temperature circuit. Myers to home, 600 miles, The highest coolant temp I saw was 183. Eliminate the small stuff first, before rushing to conclusions about mechanical damage. REASON: Engine Coolant Temperature 1 Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Also, make sure the wire doesnt have a break in it somewhere. It grounds to the block and may have a little corrosion. If you scan for actual temp, and it's lower than gauge in dash, that could be your issue. Try loosening the sensor and retightening it. Usually in the engine compartment main harness that runs up and over the valve cover, or near the passenger-side firewall. You could possibly have a rubbed-out wire on the data-link. diagram, system, cummins isx, model 379 p94-6002 - 01. cummins isx and signature series engines with cm870 controller. Maybe you bought faulty oil temp sensor (most are made in Mexico) And then there's the datalink. coolant temp sensor engine oil temp sensor low coolant sensor e2 spare engine circuit clutch switch alternator excitation t3 see sheet 5 zone f7 see sheet 4, zone k7 to main cab. Features & Benefits: High accuracy, Hermetically sealed, Small size. Buy a $20 inferred heat gun, scan engine pan, oil cooler etc. Item Type:Water Coolant Temperature Temp Sensor. The rad was replaced a month ago and coolant temp rarley goes above 195. ![]() Truck is not being used until this is resolved. If not, run truck with surge tank cap off to 185 (thermostat opens) to eliminate any air. I have a 2014 389 Peterbilt with a 550 Cummins ISX. Was oil pump checked when replacing oil cooler? Was upper rad pipe purged of air when refilling coolant for new rad? There should be a drain # on aluminum pipe. ![]() If you are lugging engine below 1400rpm on hard pull, it won't cool as quickly as keeping revs higher. Is your engine fan not automatically on at 215? Try using the manual fan switch while climbing. Sensor Coolant Temperature Sensor Crankshaft Position +5 Volt Supply Coolant TemperatureReturn 79 34 Camshaft Position Sensor Camshaft Position +5 Volt Supply 78 Crankcase Pressure Sensor 63.
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