STUD-TAPERLOCK 9M5854 - Caterpillar

Use this procedure in order to troubleshoot the following engine event.
Table 1
Engine Events
J1939 Code and Description Conditions Which Generate the Code System Response
971-31 Engine Derate Switch The engine shutdown override switch is activated while any engine derate is active.(1) The code is logged.
The Electronic Control Module (ECM) will suspend any request to shut down the engine from the shutdown switches.
1237-31 Engine Shutdown Override Switch Any of the engine shutdown switches are activated while the engine shutdown override switch is active.(1)
Note: Activation of the shutdown override switch will not disable an engine shutdown that is initiated by an engine overspeed condition.
(1) This code can be activated by a request from the control panel over the CAN data link to perform the associated task.Probable Causes
Engine Shutdown Override Switch
Activated engine shutdown override switch
Faulty circuit for the engine shutdown override switchRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.Activated Engine Shutdown Override Switch
Talk to the operator and ensure that the shutdown override switch has been activated.To resume engine shutdown monitoring, deactivate the engine shutdown override switch.Circuit for the Engine Shutdown Override Switch
Inspect the shutdown override switch for evidence of damage that has been caused by vibration, moisture, or corrosion.Troubleshoot the circuit for the shutdown switch. Refer to Troubleshooting, "Switch Circuits - Test".