YOKE ASSEM. 4V7078 - Caterpillar

Probable Causes
The probable root causes are listed in order below:
Customer Specified Parameters
Electronic system
Cold Mode operation
Malfunction of an individual cylinder
Power Train Data Link
ECM or Personality Module
Torque limit switch
Theft Deterrent
Injection actuation pressure
Combustion problemRecommended Actions
Perform the following diagnostic procedures in order:Customer Specified Parameters
Check Customer Specified Parameters.
Verify that the complaint is not normal operation (programmed parameter).
Connect Caterpillar Electronic Technician (ET) to the cab data link connector.
Check the following parameters:
"Rating Number"
"Top Engine Limit"
"Vehicle Speed Limit"
"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.Electronic System
Connect ET to the cab data link connector.
While the problem is occurring, check for diagnostic codes that are related to the boost pressure sensor and the atmospheric pressure sensor. If a diagnostic code is found, refer to Troubleshooting, "Engine Pressure Sensor Open or Short Circuit - Test".
Monitor the fuel position, the rated fuel limit and the fuel limit for fuel ratio control (FRC).While the vehicle is operating under full load, the parameters should meet the following conditions:
The fuel position is equal to the rated fuel limit.
The fuel position is less than the FRC limit.If the fuel position is equal to the rated fuel limit and the fuel position is less than the FRC limit, the electronics are operating correctly.
If the fuel position is not equal to the rated fuel limit and/or the fuel position is not less than the FRC limit, perform the following tests in order:
When the engine is OFF, turn the ignition key switch to the ON position. Check the boost pressure on the ET status screen. When the engine is OFF, the boost pressure should be 0 kPa (0 psi).Cold Mode Operation
Note: This is normal operation if the problem occurs only after start-up in cold weather.
Connect ET to the cab data link connector.
Use ET to verify that the engine has progressed from cold mode. An active cold mode is indicated in the upper corner of any status screen.Individual Cylinder Malfunction
Ensure that the electronic unit injector connector (J300/P300) is fully connected and ensure that the electronic unit injector connector (J300/P300) 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 ET to the cab data link connector. 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".
Perform a Performance Analysis Report (PAR).Power Train Data Link
Check the "Powertrain Data Link". Ensure that the SAE J1939