TUBE AS 3300798 - Caterpillar

Which Generate This Code:This diagnostic code is activated when the ECM detects a problem with it's internal memory.The possible causes of this diagnostic code are listed:
There is an error with the internal memory.
The ECM has failed. This is unlikely.System Response:The machine response is listed:
Some functions may not work properly.
Some calibrated values may be reset to default values.Note: Ensure that the diagnostic code is active and that the diagnostic code indicator is active.Test Step 1. CHECK FOR THE COMPATIBILITY OF THE SOFTWARE.
For the correct software part numbers, refer to the Electronics Groups in the parts manual for the machine that is being serviced.Expected Result:The software is compatible.Results:
YES - The software is compatible. Proceed to Test Step 2.
NO - The software is not compatible.Repair: Install the correct software. If any modules have been replaced, ensure that the correct part number was used. Stop.Test Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Turn the key start switch to the OFF position.
Turn the disconnect switch to the OFF position.
Remove connectors J1 and J2 from the ECM. Check for connector damage or corrosion. Reconnect connectors J1 and J2.
Turn the key start switch and the disconnect switch to the ON position.
Clear all inactive diagnostic codes.
Operate the machine.
Observe the status of the CID 0591 FMI 12 diagnostic code.Expected Result:The he CID 0591 FMI 12 diagnostic code is not active at this time.Results:
YES - The diagnostic code is not active.Repair: The diagnostic code is not active now. The diagnostic code could have been caused by a poor connection at one of the connectors that was checked or recycling the power for the ECM could have cleared the internal memory problem. Resume normal machine operation. Stop.
NO - The diagnostic code is still active. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Repeat this procedure again. If the CID 0591 FMI 12 diagnostic code can not be cleared, replace the ECM. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.