0324041 JOHNSON RING, Switch

Recommended Actions
Note: If the problem only occurs under certain conditions, test the engine under those conditions. Examples of certain conditions are high engine speed, full load and engine operating temperature. Troubleshooting the symptoms under other conditions can give misleading results.Diagnostic Codes and Event Codes
Certain diagnostic codes and/or event codes may cause poor performance. Connect the Caterpillar Electronic Technician (ET) and check for active codes and for logged codes. Troubleshoot any codes that are present before continuing with this procedure.Engine Rating
Verify that the correct engine rating is being used for the application.Programmable Parameters
Check the following parameters on Cat ET:
Verify that the injector codes are programmed.
"Throttle position sensor"
"Desired speed input configuration"
"Direct fuel control mode"Determine the type of throttle that is used in the application. Program the parameters to match the type of throttle that is used. Refer to Troubleshooting, "Throttle Position Sensor Circuit - Test" for more information.Note: If the parameters are not programmed correctly, then the engine will have poor performance.Starting Aids
Cold Mode
Use the electronic service tool to verify that the engine has exited cold mode. If the engine is operating in cold mode, an indicator will be displayed on the top of any of the status screens on the electronic service tool. Cold mode operation may slow throttle response.Air Inlet Heater
Ensure that the air inlet heater is operating correctly. For additional information on the air inlet heater, refer to Troubleshooting, "Air Inlet Heater Circuit - Test".Active Engine Derate
If an active derate occurs, the warning lamp will flash. "Engine Derate" will appear in the first engine status box on any Cat ET status screen. Verify that the set points for "Derate" that are in the programmable monitoring system have been programmed to the values that are correct. An SPN-FMI code will appear for an active derate on a J1939 receiving device that will display SPN diagnostic codes.Electrical Connections to the ECM
Check the associated wiring for damage, for abrasion, for corrosion or for incorrect attachment on the following connectors: Electronic Control Module (ECM) connectors, customer connector and throttle position sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for additional information.PTO Enable Switch
Connect Cat ET and verify that the PTO enable switch is not engaged. Remove the wire for the PTO enable switch and cycle the power to the ECM. Verify that the problem is still present. If the problem is still present, reattach the wires and continue to next step. If the problem is resolved, refer to Troubleshooting, "PTO Ramp Up/Down Switch Circuit-Test".Intermediate Speed Switch
Connect Cat ET and verify that the intermediate speed switch is not engaged. Remove J1:45 (intermediate speed) and cycle power to the ECM. Verify that the problem is still present. If the problem is still present, reattach the wires and continue to next step. If the problem is resolved, refer to Troubleshooting, "Switch Circuits - Test".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 cannot 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.Circuit for the Electronic Unit Injector
Inspect the J2/P2 ECM connector and the J300/P300 unit injector connector for proper connections. Refer to Troubleshooting, " Electrical Connectors - Inspect". Connect Cat ET and cut out each cylinder in order to isolate the misfiring cylinder or cylinders. If the results are inconclusive, shut off half of the cylinders and repeat the cylinder cutout test on the active cylinders in order to locate those cylinders that are malfunctioning. Refer to Troubleshooting, "Injector Solenoid Circuit - Test".Low Injection Actuation Pressure
Check the engine oil level. Engine oil is used to activate the high pressure hydraulic pump.
Ensure that the engine oil meets the recommendations of the Operation and Maintenance Manual.
Crank the engine and monitor the injection actuation pressure and the output of the injection actuation pressure control valve. The high pressure oil system is operating properly if the pressure output is a minimum of 6 MPa (870 psi).
Connect Cat ET and check for the CID 164-11 diagnostic code.If this diagnostic code has been logged recently, refer to Troubleshooting, "Injector Actuation Pressure System-Test".Fuel Supply
Check for a problem with the fuel supply and verify the fuel pressure. Verify that the fuel pressure sensor is installed. For further information, refer to Testing and Adjusting, "Fuel System".Turbocharger Outlet Pressure Sensor (Intake Manifold Air), Rated Fuel Position and/or FRC Fuel Position
With the engine at full load, monitor "Fuel Position" and "Rated Fuel Limit" on the status screen. If "Fuel Position" does not equal "Rated Fuel Limit", then check air inlet manifold pressure.
Verify that there are no active diagnostic codes that are associated with the turbocharger outlet pressure sensor (intake manifold air) or with the atmospheric pressure sensor.
Monitor air inlet manifold pressure and atmospheric pressure for normal operation on the status screen.Note: Atmospheric pressure is not a default parameter on the status screen. A new parameter screen must be set up in order to monitor the atmospheric pressure sensor.Air Inlet and Exhaust System
Check the air inlet and exhaust systems for restrictions and for leaks. Refer to the Operation and Maintenance Manual for more information. Look for an indication of the warning lamp or restriction indicators that are tripped if the filters are equipped with these devices. These indicators are associated with plugged filters. Replace the plugged air filters or clean the plugged air filters per the guidelines for theOperation and Maintenance Manual. Repair any leaks that are found in the system.