RING-BACKUP 2674821 - Caterpillar

Probable Causes
The probable root causes are listed in order below:
Customer specified parameters (normal operation)
Cold mode operation
Individual malfunctioning cylinder
"Power train Data Link"
Personality module
Torque limit switchRecommended Actions
Perform the following diagnostic procedures in order:
Check customer specified parameters.
Verify that the complaint is not normal operation (programmed parameter).
Connect an electronic service tool.
Check the following parameters:
"Lower Gears Engine RPM Limit"
"Intermediate Gears Engine RPM Limit"
"Gear Down Protection Engine RPM Limit"
Set each parameter to the parameter's maximum value one at a time and determine whether the problem is corrected.
Check cold mode operation.Note: This is normal operation if the problem occurs only after start-up in cold weather.
Connect an electronic service tool.
Monitor the electronic service tool in order to verify that the engine has progressed from cold mode.An active cold mode is indicated in the upper corner of any status screen.
Check for an individual malfunctioning cylinder.
Ensure that the electronic unit injector connector (J5/P5) is fully connected and ensure that the electronic unit injector connector (J5/P5) is free of corrosion.
Ensure that the ECM engine harness connector (J2/P2) is fully connected and ensure that the engine harness connector (J2/P2) is free of corrosion.
Connect an electronic service tool. Use the cylinder cutout test. Access the cylinder cutout test by selecting the "Diagnostic Menu" and the "Diagnostics Test Menu". Run the cylinder cutout test in order to disable each cylinder. Disabling each cylinder allows the technician to isolate the misfiring cylinders.If the misfiring cylinder can be isolated to a specific cylinder, refer to Troubleshooting, "Injector Solenoid Circuit - Test".
Check the "Power train Data Link". Ensure that the SAE J1922 or the SAE J1939 Power train Data Link is not limiting the power.
Connect an electronic service tool.
Monitor the "Power train Data Link" status screen while the vehicle is experiencing problems.If the "Power train Data Link" status screen indicates that the "Power train Data Link" is limiting the power or the rpm, verify that this is not normal operation. If this is not normal operation, refer to the vehicle OEM for repairs.
Check the ECM or the personality module.
Connect an electronic service tool.
Verify that the correct personality module has been installed.Refer to Troubleshooting, "ECM Memory - Test".
Check the torque limit switch.
Connect an electronic service tool.
Check the setting for the customer parameter for the "Torque Limit".If the "Torque Limit" is programmed below 2720 N m (2000 lb ft), check the status screen for auxiliary input 1 and auxiliary input 2. Ensure that the status screen indicates "OFF". If the status is ON and a torque limit is programmed, the system is operating correctly. If the switch that is connected to this signal input is not switching ON and switching OFF, refer to Troubleshooting, "PTO Switch Circuit - Test".