AIR CONDITIONER AR 1582960 - Caterpillar

Probable Causes
Diagnostic codes
Flash file
Air inlet or exhaust system
Cylinder performance
Turbocharger
Electronic unit injectorsRecommended Actions
Diagnostic Codes
Check for active diagnostic codes and/or logged diagnostic codes on Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.Flash File
Use Cat ET to verify the following information:
Check for the correct flash file
Check for the correct engine serial number
Check for the correct arrangement numberAir Inlet or Exhaust System
Check the air filter restriction indicator, if equipped. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting.Turbocharger
Note: The turbocharger that is installed on this engine is a nonserviceable item. If any mechanical fault exists, except for the wastegate actuator (if equipped), then the turbocharger must be replaced. The wastegate actuator (if equipped) can be replaced.
Check the following items:
Check for correct installation of the turbocharger.
Check that the turbine blades rotate freely.
Check that the oil drain is not blocked or restricted.
Check that the housing for the turbocharger is free of dirt and debris.
Ensure that the wastegate (if equipped) on the turbocharger is adjusted correctly.
If necessary, replace the turbocharger. Refer to Disassembly and Assembly.Cylinder Performance
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to service Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder. Refer to Disassembly and Assembly.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.
Perform a compression test. Refer to Testing and Adjusting. Possible causes of low compression are shown in the following list:
Faulty piston
Faulty piston rings
Worn cylinder bores
Worn valves
Faulty cylinder head gasket
Damaged cylinder head
Perform all necessary repairs. Ensure that the repairs have eliminated the problem.
If the repair does not eliminate the problem, reinstall the electronic unit injectors that were removed and continue with this test procedure.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.Electronic Unit Injectors
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized.
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder and install a new electronic unit injector. Refer to Disassembly and Assembly.Note: Discard all fuel injection lines after use. Fuel injection lines must only be used one time.
Ensure that the repairs have eliminated the problem. If there is still a problem, refer to the circuit test Troubleshooting, "Injector Solenoid - Test".