09494-00179 Suzuki Nozzle, Needle

Probable Causes
Diagnostic codes
Event codes
Derates
Cold mode and/or starting aids
Engine parameters
Throttle signal
Decelerator pedal
Intake manifold pressure sensor and atmospheric pressure sensor
Air inlet and exhaust system
Fuel supply
Cylinder performance
Electrical connectors
Accessory equipmentRecommended Actions
Diagnostic Codes, Event Codes and Derates
Certain diagnostic codes, event codes and/or derates may cause poor performance. Connect Caterpillar Electronic Technician (ET) and check for active codes and/or for logged codes. Troubleshoot any codes that are present before continuing with this procedure.If this application supports engine derates, use Cat ET to check for logged derates. Refer to Troubleshooting, "Event Code List" for the specific events that are applicable to this application. A status screen on Cat ET will display a derate if a derate is active.Cold Mode and/or Starting Aids
Connect Cat ET to the service tool connector. Verify that the engine has exited cold mode. This may limit engine speed.Check the operation of the air inlet heater (if applicable). Ensure that the air inlet heater is operating properly. For additional information on troubleshooting electrical problems with the air inlet heater, refer to Troubleshooting, "Air Inlet Heater - Test".Check the operation of the ether injection system (if applicable). Ensure that the ether injection system is operating properly. For additional information on troubleshooting electrical problems with the ether injection system, refer to ON position. For additional information, refer to Troubleshooting, "Ether Starting Aid - Test".Engine Parameters
Verify that the correct engine parameters are being used.Throttle Signal
Connect Cat ET to the service tool connector. View the status for the throttle position on the status screen. Operate the throttle from the low idle position to the high idle position. The status should be 0 percent at low idle and the status should be 100 percent at high idle. If the status can not operate in the full range, refer to Troubleshooting, "Throttle Position Sensor - Calibrate".Diagnostic codes that are related to the J1939 data link will prevent correct operation of the throttle if the throttle position is transmitted over the data link. If there is a problem with the data link, the engine will remain at low idle until the data link is repaired.Decelerator Pedal
Monitor the decelerator pedal on Cat ET. Verify that the decelerator pedal is operating properly.Intake Manifold Pressure Sensor and Atmospheric Pressure Sensor
Monitor the status of "Fuel Position", of "Rated Fuel Limit", and of "FRC Fuel Limit" on Cat ET while the engine is operating under full load. These parameters must reflect the information below.
Table 1
"Fuel Position" = "Rated Fuel Limit"
and
"Fuel Position" < "FRC Fuel Limit"    If "Fuel Position" equals "Rated Fuel Limit" and "Fuel Position" is less than "FRC Fuel Limit", the electronics are operating correctly. Otherwise, proceed with the next Step.
Use Cat ET in order to monitor the status of the "Boost Pressure". With the engine stopped, the correct "Boost Pressure" is 0 kPa (0 psi).
Start the engine and monitor the status of "Boost Pressure" while you vary the engine speed. Ensure that the pressure reading is fluctuating with the engine speed.
Use Cat ET in order to check the status of the "Atmospheric Pressure". Verify that the pressure reading is reasonable for the current conditions.Air Inlet and 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.Fuel Supply
Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the engine has been run out of fuel, it will be necessary to purge the air from the fuel system. Refer to Operation and Maintenance Manual.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Check the fuel lines for the following problems: restrictions, collapsed lines, pinched lines and loose connections. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Prime the fuel system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsNote: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Systems Operation/Testing and Adjusting.
Check the fuel tank for foreign objects which may block the fuel supply.
Check the fuel filters.
Check the diesel fuel for contamination. Refer to Systems Operation/Testing and Adjusting.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.Cylinder Performance
Check the valve lash and reset the valve lash, if necessary. Refer to Systems Operation/Testing and Adjusting for the procedure.
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM.
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.
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.Accessory Equipment
Check all accessory equipment for problems that may create excessive load on the engine. Repair any damaged components or replace any damaged components.