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Closed loop operation
A system that uses sensors to provide feedback to the ECM. The ECM uses the sensor input to continuously
monitor variables and adjust actuators to match engine requirements.
Controller Area Network (CAN)
A J1939 high-speed communication link.
Coolant
A fluid used to transport heat from one point to another.
Coolant level switch
A switch sensor used to monitor coolant level.
Coolant Flow Valve (CFV)
The CFV is ECM controlled and redirects coolant through the fuel cooler, based on EFT, when directed.
Coolant Mixer Valve (CMV)
Controls coolant flow through the low-temperature radiator.
Continuous Monitor Test
An ECM function that continuously monitors the inputs and outputs to ensure that readings are within set
limits.
Crankcase
The housing that encloses the crankshaft, connecting rods, and allied parts.
Crankcase breather
A vent for the crankcase to release excess interior air pressure.
Crankcase Oil Separator Speed
(CCOSS) sensor
The CCOSS sensor sends the ECM information about the speed of the crankcase oil separator internal
components.
Crankcase pressure
The force of air inside the crankcase against the crankcase housing.
Crankshaft Position (CKP)
sensor
A magnetic pickup sensor that determines crankshaft position and speed.
Current
The flow of electrons passing through a conductor. Measured in amperes.
Diagnostic Trouble Code (DTC)
2010 model year vehicles no longer utilize DTC identification by number. DTCs are now identified using the
Suspect Parameter Number (SPN) and Failure Mode Indicator (FMI) identifiers only.
Diesel Particulate Filter (DPF)
A diesel particulate filter, sometimes called a DPF, is a device designed to remove diesel particulate matter
or soot from the exhaust gas of a diesel engine.
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
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