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CONTROL AR-AUX 2389779 - Caterpillar

2389779 CONTROL AR-AUX Caterpillar parts CONTROL
Alternative (cross code) number:
Caterpillar 2389779 CONTROL AR-AUX

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Probable Causes
Diagnostic codes
Event codes
Cold mode
Throttle signal
Electrical connectors
Unit injectors
Intake manifold pressure sensor
Air inlet and exhaust system
Fuel supplyRecommended 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.
Table 1
Troubleshooting Test Steps Values Results
1. Check for Diagnostic and Event Codes
A. Certain diagnostic codes and/or event codes may cause poor performance. Connect Cat® Electronic Technician (ET) and check for active codes and/or for logged codes.
Diagnostic and Event Codes
Result: There are no diagnostic or event codes.
Proceed to Test Step 2.
Result: There are diagnostic and/or event codes.
Repair: Troubleshoot any codes before continuing with this procedure.
2. Check for Cold Mode
A. Use Cat ET to verify that the engine has exited cold mode. Cold mode operation may cause the engine to run rough and engine power may be limited.
B. Observe the coolant temperature on the Cat ET status screen. Verify that the reading is valid.
Cold Mode
Result: The engine is not in cold mode.
Proceed to Test Step 3.
Result: The engine is in cold mode.
Repair: Troubleshoot the reason for the engine being in cold mode and make the necessary repairs.
3. Check the Throttle Signal
A. Monitor the status for "Throttle Position" on Cat ET. Verify that the status for "Throttle Position" is stable and that the engine is able to reach high idle speed.
Throttle Signal
Result: The throttle signal is OK.
Proceed to Test Step 4.
Result: The throttle signal is NOT OK.
Repair: Refer to the appropriate troubleshooting procedure for troubleshooting the throttle signal.
4. Check the Electrical Connectors
A. Check for correct installation of the J1/P1 and J2/P2 Electronic Control Module (ECM) connectors and the unit injector connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Electrical Connectors
Result: The electrical connectors are OK.
Proceed to Test Step 5.
Result: The electrical connectors are NOT OK.
Repair: Repair or replace any damaged or worn components.
5. Check the Unit Injectors
A.Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM.
B. Perform the "Cylinder Cutout Test" on Cat ET in order to identify any misfiring cylinder(s). Refer to Troubleshooting, "Injector Solenoids Circuit - Test" for more information.
Unit Injectors
Result: The unit injectors are OK.
Proceed to Test Step 6.
Result: The unit injectors are NOT OK.
Repair: Replace the unit injectors.
Table 2
"Fuel Position" = "Rated Fuel Limit"
"Fuel Position" < "FRC Fuel Limit"
Table 3
Troubleshooting Test Steps Values Results
6. Check the Intake Manifold Pressure Sensor
A. Monitor the status of "Fuel Position", "Rated Fuel Limit", and "FRC Fuel Limit" on Cat ET while the engine is operating under full load. These parameters should reflect the information that is contained in Table 2.
B. 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.
C. Monitor the status of "Intake Manifold Pressure" and "Atmospheric Pressure" for normal operation on Cat ET. When the engine is not running, the correct value for "Intake

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