Usage:
Programming Parameters
Certain parameters that affect engine operation can be changed with an Electronic Service Tool. The parameters are stored in the ECM, NOT in the Personality Module. Any parameter can be read, but passwords protect certain parameters from unauthorized changes. Parameters which can be changed have a tattletale number following the parameter value that indicates how many times that parameter has been changed.
Parameters fall into two categories: System Configuration Parameters and Customer Specified Parameters. System Configuration Parameters are those that effect emissions or power ratings and can only be changed with the proper Factory Passwords. Customer Specified Parameters affect the low and high idle engine rpm setting and require Customer Passwords to change.
Electronic Technician (ET)
For details on how to read and change parameters using ET, Communication Adapter Tool and the appropriate software, refer to the instructions included with the JERD2129 ET Data Subscription and the JERD2124 ET Software.
Electronic Control Analyzer Programmer (ECAP)
For details on how to read and change parameters using ECAP, refer to Special Instruction SEHS9199, Using The NEXG4516 Marine/Industrial Engine Functions Service Program Module and Tool Operating Manual SEHS9264.
Passwords
System Configuration Parameters are protected by Factory Passwords and Customer Specified Parameters are specified by Customer Passwords.
Factory Passwords
Factory Passwords are required to perform the following functions:
- 1. Read Customer Passwords. If the owner looses his Customer Passwords he will no longer be able to program Customer Specified Parameters. Customer Passwords can be viewed on an electronic service tool with the proper Factory Passwords.
- 2. Clear certain diagnostic codes. Only diagnostic code 190-00 (Engine Overspeed Warning) requires factory passwords to clear once it is logged. The majority of logged codes require no password to clear. To obtain factory passwords, proceed as if you already have the password. If a factory password is needed, the electronic service tool will request factory passwords and display most of the information required to obtain the passwords.
NOTE: The passwords are only good for one programming or clearing session. A different set of passwords will be required after exiting the Electronic Service Tool Screen.
Customer Passwords
Customer Passwords are required to change Customer Specified Parameters. Contact the engine owner to obtain Customer Passwords. If the owner has lost his passwords, customer passwords can be read as follows:
1. Use an electronic service tool to access Read/Change System Configuration Parameters, then Read Customer Parameters.
2. When the Factory Passwords Screen appears, record the information listed on the Factory Passwords Worksheet.
3. Obtain the Factory Passwords. The information recorded above must be provided and generates a permanent record at Caterpillar of the access.
4. Enter the Factory Passwords at the Factory Passwords Screen.
5. When the Read Customer Passwords Screen appears, record the Customer Passwords. The Customer Passwords may then be used to change Customer Specified Parameters.
System Configuration Parameters
System Configuration Parameters are those that effect emissions or the power rating of the engine. They are programmed at the factory and normally would never need to be changed through the life of the engine. Proper values for these parameters are stamped on the engine information ratings plate located on the engine. Factory Passwords are required to change these parameters. Following is a description of the System Configuration Parameters
Full Load Setting
A number representing fuel system adjustment at the factory to fine tune the fuel system. The correct value for this parameter is stamped on the engine information ratings plate.
Full Torque Setting
Similar to the Full Torque Setting. It is a number representing an adjustment made at the factory to fine tune the fuel system. The correct value for this parameter is stamped on the engine information ratings plate.
Personality Module Code
This code prevents the use of the wrong Personality Module for the engine. Each power rating family and emission certification has a different code associated with it. The Personality Module Code is stored in the ECM and MUST match the code in the Personality Module or a 253-02 Diagnostic Code (56) will be generated. When rerating an engine or installing a new ECM, programming the Personality Module Code to 0 (zero) will prompt the ECM to read and match it's stored code to the Personality Module.
NOTE: This parameter DOES NOT need to be reprogrammed when a personality module is replaced with a personality module of the same rating. If the personality module is replaced with a new power rating, other mechanical modifications (pistons, etc) may also need to be made and the engine information ratings plate should be updated.
Engine Serial Number
Should be programmed to match the engine serial number stamped on the engine information ratings plate. A new ECM is delivered with the serial number programmed to 0XX00000.
Customer Specified Parameters
Customer Specified Parameters allow a customer to program some engine system related features.
Customer parameters may be changed repeatedly. Customer Passwords are required to change these parameters. The following is a brief description of the Customer Specified Parameters and their maximum, minimum, and default values.
Low Idle Engine RPM
Programs the engine idle speed.
Fuel To Air Ratio
This parameter selects an FRC Limit Map to control exhaust smoke during acceleration. It is similar to Fuel Ratio Control settings on a mechanically governed engine. The setting options are:
Replacing The ECM
The Electronic Control Module (ECM) is the center of the engine control system and it is easy to come to the conclusion that the ECM is responsible when a problem occurs. That is usually a wrong conclusion. The ECM has no moving parts inside and therefore seldom fails.
Most failures occur at a sensor input/output or in the wiring and connectors. Follow the troubleshooting procedures and do not replace an ECM on speculation!
However, when troubleshooting indicates that an ECM failure has occurred, temporarily mount a new ECM on the side of the engine and thoroughly retest. If the problem is no longer present, proceed with the following steps to permanently replace a faulty ECM.
ECM Replacement Procedure
1. Record Customer Specified Parameters from the failed ECM. If the electronic service tool is unable to communicate with the ECM, proceed to step 2.
A) Obtain and record the Customer Passwords Refer to Customer Passwords if the owner has lost them.
B) Use an electronic service tool to access Read Customer Specified Parameters from the ECM being replaced.
C) Use the Customer Specified Parameters Worksheet to record customer parameters.
2. Replace the faulty ECM
3. Obtain Factory Passwords
A) Record Engine Hours from the engine hourmeter.
B) Use an electronic service tool to access Read/Change System Configuration Parameters. When the Factory Passwords Screen appears, record the following information on the Factory Passwords Worksheet: ECM Serial Number, Engine Serial Number, Service Tool Serial Number, and Total Tattletales.
C) Leave the electronic service tool on the Factory Passwords screen and obtain the passwords by providing the information on the Factory Passwords Worksheet.
4. Program the new ECM.
A) Enter the Factory Passwords at the Factory Passwords Screen.
B) Enter the Full Load Setting, Full Torque Setting, and Engine Serial Number recorded on the worksheet. Program the Personality Module Diagnostic Code to 0 (zero) before leaving the screen. All the necessary System Configuration Parameters MUST be programmed before exiting this screen or a new set of passwords will be required.
NOTE: If the Customer Specified Parameters are entered before System Configuration Parameters, the Total Tattletales will change. It will then be necessary to obtain another set of Factory Passwords to access the System Configuration Parameters.
C) Access the Read/Change Customer Specified Parameters and enter the original values recorded on the worksheet.
D) Use the electronic service tool to access Calibrate/Monitor Sensors and calibrate the Boost Pressure Sensor.
5. Calibrate the Rack Position Sensor. Refer to P-531: Rack Position Sensor / Calibration for details.
Factory Passwords Worksheet
Customer Specified Parameter Worksheet
