SPACER 9W6371 - Caterpillar

The diagnostic code that is listed in Table 1 is for the in-line engines. The diagnostic codes that are listed in Table 2 are for the vee engines.
Table 1
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
591-12 EEPROM checksum fault or ECM not programmed     The Integrated Combustion Sensing Module (ICSM) detects a problem within the EPROM circuit.     The shutdown output is activated. The code is logged.
The ICSM may not function. If the ICSM does not function, the engine is shut down.    
Table 2
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
253-2 Personality Module : Erratic, Intermittent, or Incorrect     The software in the right side ICSM does not match the software in the left side ICSM.     The shutdown output is activated. The code is logged.
The engine is shut down.    
591-12 EEPROM checksum fault or ECM not programmed     An ICSM detects a problem within the EPROM circuit.     The shutdown output is activated. The code is logged.
An ICSM may not function. If an ICSM does not function, the engine is shut down.    Note: The ICSM contains no moving parts. Failure of the ICSM is unlikely. Before you replace an ICSM, load the flash file for the ICSM in order to be sure that the flash file is not the problem.Use the following guidelines to verify that the suspect ICSM is the cause of the problem:Install a test ICSM in place of the suspect ICSM. Transfer the software from the suspect ICSM to the test ICSM. Program all the parameters for the test ICSM in order to match the parameters of the suspect ICSM. The parameters must match. Refer to the following steps for details on programming the parameters.If the test ICSM resolves the problem, reconnect the suspect ICSM. Verify that the problem recurs. If the problem recurs, replace the suspect ICSM with the test ICSM.Use the following procedure to replace the ICSM:Note: If the parameters cannot be read from the suspect ICSM, the parameters must be obtained from records or from the factory.
Use the "Service/Copy Configuration/ECM Replacement" function of Caterpillar Electronic Technician (ET) in order to transfer the software from the suspect ICSM.You may also select the "Print" function in order to obtain a paper copy of the parameter settings.Note: Before you replace an ICSM, record all of the logged events.
Connect Cat ET with the communications adapter. Select "Service/Copy Configuration/ECM Replacement" from the pull-down menu.Cat ET will load the configuration parameters and the monitoring parameters from the ECM.
Select "Load from ECM" in the lower left corner of the screen. Select the suspect ICSM and select "OK".After the loading is complete, Cat ET will display this message: "The data has been successfully loaded from the ECM". Select "OK".
Select "File/Disconnect F8" from the pull-down menu.Note: Do not exit from Cat ET.
Replace the ICSM.
Turn the engine control switch to the "OFF/RESET" position.
Illustration 1 g00842289
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