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If the "Barometric Pressure Sensor Calibration Value" is not configured in Cat® Electronic Technician (ET), the 630-2 code will become active. The value must be entered in Cat ET to the specific site value.System configuration parameters are configured to specify the emissions levels, the power rating, and the specific application. Default values for the parameters are programmed at the factory. Some parameters may be changed to equip the engine for a specific application. The system configuration parameters must be reprogrammed if the ECM is replaced without using the "Copy Configuration" tool that is in Cat ET. If you update the flash file for the ECM, the configuration parameters are retained in the resident memory of the ECM. Certain configuration parameters are stamped into the engine information plate. These parameters may also be changed by using the Messenger panel or by using an aftermarket device (electronic service tool).Some parameters are protected by security passwords. Customer passwords or factory passwords will require Cat ET to change these parameters. Refer to Testing and Adjusting, "Customer Passwords" and Testing and Adjusting, "Factory Passwords" for details.Note: Factory passwords are only available to service technicians from an authorized Caterpillar Dealership. Customers of Caterpillar do not have access to the Caterpillar Feature Protection System (FPS). If the parameters that are protected with factory passwords are changed without authorization from Caterpillar, the repair may not be covered under the Caterpillar warranty.ECM Identification Parameters
Equipment ID
The customer can assign an Equipment ID to identify the engine application.Engine Serial Number
The engine serial number is programmed into the ECM at the factory. The number is stamped on the engine information plate. If the ECM is replaced, the engine serial number must be programmed into the new ECM.ECM Serial Number
The ECM serial number is programmed into the ECM at the factory.Software Group Part Number
Part number of the flash file that is currently installed in the ECM.Software Group Release Date
Release date of the flash file that is currently installed in the ECM.Software Group Description
Description of the application for the flash file that is installed in the ECM.Timing Control
The timing parameters allow the customer to program the ignition timing for the engine to meet the needs for specific applications and specific installations.Note: The actual ignition timing at a given instance may vary from the desired timing value. This variance is due to variations in the engine speed, engine load, or detonation.First Desired Timing
The First Desired Timing is determined with the methane number of the primary fuel that is used. Use the Engine Performance Sheet, "Fuel Usage Guide".Note: Determine the first desired timing by using the newest version Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)" with the results that are from the fuel analysis. Use of only the data from the gas analysis can result in incorrect settings.Air/Fuel Ratio Control
Before the initial start-up, a current gas analysis is required. Periodic gas analyses are also recommended. Reference Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)" to calculate the parameters for air/fuel ratio control for Caterpillar Gas Engines. The results are programmed into the ECM.The Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)" also contains information that is related to engine performance.Emissions Feedback Mode Configuration
The "Emissions Feedback Mode Configuration" parameter can be set to "Oxygen Feedback" or to "Feedback Disabled". This feature allows the feedback control to be disabled to troubleshoot the engine. For example, disable this feature to determine if the air/fuel ratio control is the cause of a problem with instability of the engine.If a problem with the oxygen sensor is suspected, set this parameter to "Feedback Disabled". This setting will place the engine control in open loop mode. Use the "Emissions Feedback Disable Fuel Actuator Position Command" parameter to adjust the air/fuel mixture for the engine. An emissions analyzer must be used to verify the emissions levels of the engine while the engine is operated in open loop mode.Do not leave an engine that is operating in open loop mode unattended.Aftertreatment #1 Outlet Oxygen Sensor Voltage Offset
Use the "Aftertreatment #1 Outlet Oxygen Sensor Voltage Offset" parameter to calibrate the control map for the oxygen sensor signal voltage while the engine is in "Oxygen Feedback" mode. Use an emissions analyzer to determine the emission levels of NOX that is in the exhaust. Increment the "After treatment #1 Outlet Oxygen Sensor Voltage Offset" parameter to increase the level NOX in the exhaust. Decrement the "After treatment #1 Outlet Oxygen Sensor Voltage Offset" parameter to decrease the level NOX in the exhaust.Emissions Feedback Disable Fuel Actuator Position Command
Use this parameter to adjust the fuel valve position while the Emissions Feedback Mode Configuration is set to Feedback Disabled.Speed Control
Low Idle Speed
Program this parameter to the desired low idle rpm.Engine Acceleration Rate
This parameter controls the rate for engine response to a change in the desired engine speed. For example, the engine can be programmed to accelerate at a rate of 50 rpm per second when the "Idle/Rated" switch is turned to the "Rated" position.This parameter is also used for the rate of deceleration.Maximum Engine High Idle Speed
Program this parameter to the desired maximum high idle rpm.Note: The actual engine speed is regulated by the desired speed control at the control panel. The desired engine speed is based on a linear scale and is in proportion to the setting of the desired