0384917 JOHNSON CARBURETOR ASSY

System Configuration Parameters
System Configuration Parameters affect emissions or power of the engine. They are programmed at the factory and would normally never need to be changed through the life of the engine. System Configuration Parameters must be reprogrammed if an ECM is replaced but not if the Personality Module is replaced (unless the engine rating changes). Proper values for these parameters are stamped on the Engine Information Plate located on the valve cover or inlet manifold. The following is a description of the System Configuration Parameters.Full Load Setting
The setting number represents the fuel system adjustment performed at the factory to fine tune the fuel system. A new ECM must have this parameter programmed to avoid generating a Diagnostic Code 253-02 Check Customer Or System Parameters (56).Full Torque Setting
Similar to Full Load Setting, this parameter must be programmed or a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will be generated.Personality Module Code
Code which prevents use of incorrect Personality Module for this engine. Each power family has a different code associated with it. When a Personality Module is replaced (either using a Personality Module chip or if flash programmed), this code (stored in the ECM) must match the one in the introduced Personality Module or the engine will only run at low idle and a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will also be generated. When rerating the engine, programming this code to "0" will prompt the ECM to read and match its stored code to the Personality Module Code.Engine Serial Number
The engine serial number should be programmed to match the engine serial number stamped on the Engine Information Plate. A new ECM is delivered with the engine serial number programmed to 0XX00000.Customer Specified Parameters
Customer Specified Parameters allow the engine owner to influence how a unit operates. Some parameters may affect engine operation in ways an inadequately trained operator does not expect. These parameters may lead to power or performance complaints, even when the engine is performing to specification.Customer parameters may be changed repeatedly as a customer changes his operation or as new operators are assigned. Customer passwords are required to changed these parameters.The following is a brief description of the Customer Specified Parameters with the minimum and maximum values for the parameter and the default value. The tables show values in metric units followed by an approximate range for its US (or English) units counterpart. The exact range of the parameter in metric units depends upon the Electronic Service Tool used because each tool may use slightly different conversion factors.Engine Power Rating Selection Number
Number of rating within power family. The Personality Module defines the power family [such as 242 kW (325 hp)] and may contain only one or several ratings. The rating number defines which rating is used [such as 242 kW (325 hp) and 1900 rpm or 242 kW (325 hp) and 2100 rpm] within the family.Vehicle ID
Identification of the machine assigned by the customer. Used only for customer reference, not required by the ECM.Tachometer Calibration
Used by the ECM to scale the engine speed signal into revolutions per minute for a tachometer. Programmed in pulses per revolution, the range is from 12 to 500 ppr. Low Idle
Minimum programmable engine rpm that the engine will run with the throttle or throttle switch at minimum position. Auxiliary Temperature
High Auxiliary temperature can be programmed to any value from 50 to 120°C (122 to 248°F). The High Auxiliary Temperature Lamp on the CMS will flash when the auxiliary temperature exceeds the high set point. PTO/Extend Idle Engine RPM Limit (PTO Mode engine RPM Limit)
Minimum programmable engine PTO rpm limit. PTO Engine RPM Rate
Engine rpm rate of increase/decrease. This parameter determines Accel, Decel, and Resume PTO Engine rpm rates of increase/decrease. The parameter can be set to an rpm value between 5 and 1000 inclusively. Top Engine Limit (TEL)
Maximum engine rpm when the engine is under load. the engine will still achieve Rated RPM under no load conditions. TEL is dependent upon the RATING number with some RATING numbers allowing no or little variation. Top Engine Limit with Droop (Top Engine Limit Overrun)
Allows the engine to exceed the Top Engine Limit with a partial load. The "RPM Limit" increases linearly as load decreases to 150 rpm above the selected limit for no load. A/C Pressure Switch Fan-On Time
An input to the ECM is available for connection of a normally closed High Pressure A/C Switch. The ECM has a timer built in to prevent excessive cycling of the cooling fan clutch due to successive cycling of the A/C switch input. Engine Monitoring Mode
Determines the level of action taken by the ECM in response to a potentially engine damaging condition. The ECM will respond to inputs from the Coolant Temperature, Inlet Manifold Temperature, Oil Pressure, Or Coolant Level (if installed) Sensors. Refer to Troubleshooting With A Diagnostic Code for information regarding diagnostic codes and their effect on engine operation. Coolant Level Sensor Enable/Disable
Determines if the ECM monitors the Coolant Level Sensor Inputs. Fuel Correction Factor
The fuel correction factor is available to fine tune all fuel data stored in the future by the ECM. Caterpillar recommends this factor be changed only after a significant operating interval with a comparison o factual tank capacity fuel economy compared to ECM recorded fuel economy. The operating interval should also reflect a typical operating routing. The Factor is a percentage, programmable in one-half (0.5) percent increments.