PUMP GP-AUX -B 10R1673 - Caterpillar

Use this procedure in order to troubleshoot an unexpected engine shutdown or use this procedure if one of the following diagnostic codes is logged.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
970-31
Engine Auxiliary Engine Shutdown Switch The auxiliary engine shutdown switch is use to shut down the engine.
The emergency stop switch is use to shut down the engine.
An emergency stop command is received by the engine Electronic Control Module (ECM) over the CAN data link from the control panel. The code is logged.
The ECM disables injection. The engine is shut down. Probable Causes
Diagnostic codes
Engine shutdown using the customer stop switch
Electronic unit injectors
Engine shutdown using the emergency stop switch at the control panel
Faulty circuit for the emergency stop switch or the customer stop switch
Fuel supplyRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Activated Shutdown
A. Interview the operator and determine the reason for the shutdown.
Operator
Result: The shutdown was intentional.
Ensure that the reason for the shutdown has been corrected.
Reset the control system. Resume normal operation.
Result: The stop was accidental.
Reset the control system. Resume normal operation.
Result: The emergency stop shutdown was activated.
Reset the shutdown switch. Confirm that the condition for the emergency stop shutdown has been resolved.
Cycle the keyswitch in order to reset the control system.
Result: The emergency stop shutdown was not activated.
Proceed to Test Step 2.
2. Diagnostic Codes
A. Establish communication with Cat ET. Refer to Troubleshooting, "Electronic Service Tools".
B. Check for active codes on Cat ET.
Codes
Result: There are active codes.
Troubleshoot any active codes before continuing with this procedure.
Result: There are no active codes.
Proceed to Test Step 3.
3. Check the Circuit for the Stop Switches
A. Inspect the wiring between the switches and the connector of the ECM.
B. Look for damage and/or for corrosion. Refer to Troubleshooting, "Switch Circuit - Test".
Connectors and Wiring
Result: The connectors or wires are OK.
Proceed to Test Step 4.
Result: The connectors or wires are Not OK.
Repair: Make all necessary repairs.
Verify that the repair eliminated the problem.
4. Inspect the Stop Switches
A. Inspect the stop switches for evidence of damage that has been caused by vibration.
B. Disassemble the switches. Inspect the components for looseness, cracks, and abrasion.
Switches
Result: The switches are OK.
Proceed to Test Step 5.
Result: The switches are Not OK.
Repair: Make all necessary repairs.
Verify that the repair eliminated the problem.
5. Fuel Supply
A. Visually check the fuel level. Do not rely on the fuel gauge only. If the engine has been run out of fuel, air must be purged from the fuel system.
B. Inspect the fuel system. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for more information.
C. Check the fuel tank for foreign objects which can block the fuel supply.
Supply
Result: The fuel system is OK.
Proceed to Test Step 6.
The fuel system is NOT OK.
Repair: Make all necessary repairs.
Verify that the repair eliminated the problem.
6. Electronic Unit Injectors
A. Perform the "Injector Solenoid Test" in order to determine if all of the injector solenoids are being energized by the ECM.
B. Perform the "Cylinder Cutout Test" in order to identify any injectors that might be misfiring.
Fuel injectors
Result: The