PRECLEANER GP 2379250 - Caterpillar

The ESTAT provides self-diagnostic functions and increased service reliability. These features can help to reduce the repair times and warranty claims that are associated with the cooling system.There are two modes of operation and several states of operation for the EFTC.
Table 2
Mode State Controlling ECM
Position Control Active Engine ECM
Temperature Control Active EFTC
Temperature Control Ambient EFTC
Temperature Control Warmup EFTC
Temperature Control Regulating EFTC
Temperature Control Cool down EFTC The two modes of operation are the Position Control Mode and the Temperature Control Mode.In the Position Control Mode the engine ECM overrides the EFTC via the Local CAN bus and commands the EFTC to drive the piston to a specific position. When in this mode, ET will report the Engine Coolant Thermostat Mode as "Position Control Mode" and the Engine Coolant Temperature Control State as "Active".An example of Position Control Mode is the purge cycle. The purge cycle is used to pass any air trapped in the cooling system to the radiator top tank/expansion tank to prevent cavitation of the JW pump. This cycle will be initiated when the engine is first started. While this cycle is being performed, ET will report the Control Mode as "Position Control Mode" and the Control State as "Active". During the purge cycle the EFTC will position the piston at 20% for the first 100 seconds and then move the piston to 0% for the duration of the Purge Cycle. The Purge Cycle will terminate after 130 seconds or when the Engine Coolant Pump Outlet Temperature reads greater than 75° C (167° F).Note: Refer to Troubleshooting, "Configuration Parameters" for default settings and ranges.In the Temperature Control Mode the EFTC uses the Configuration Data, input from the Engine ECM via the Local CAN Bus, and input from the Engine Coolant Pump Outlet Temperature Sensor to determine the control state and the position of the piston. When in this mode, the EFTC is determining the position of the piston in the three-way valve and ET will report the Engine Coolant Thermostat Mode as "Temperature Control Mode".When in the Temperature Control Mode the operating conditions of the engine will dictate the state of operation for the EFTC. The cooling system is allowed to change states when all the conditions for the desired state are achieved. The different states of the electronic fluid temperature control are described below:Power-up – At power-up the EFTC assumes that the position of the piston is at the 100% position (fully open). It will then drive the piston in the CCW direction towards the 0% Position (fully closed). After 46 rotations of the stepper motor the piston will be guaranteed to be at the 0% Position, if all components are fully functional.If the piston reaches the 0% position before the 46 rotations of the stepper motor are complete, the EFTC will continue to drive the stepper motor in the CCW direction. This action will create a ratcheting sound and is normal.After the 46 rotations of the stepper motor are complete the EFTC will enter