STEP AS 6Y4986 - Caterpillar

Operation Description:PTO Shutdown TimerA programmable parameter for the PTO shutdown timer is provided. This timer will shut down the engine when all of the following conditions are met:
The PTO shutdown time that is programmed has expired.
The Engine Control Module (ECM) is programmed to use dedicated PTO parameters.
The PTO On/Off switch is on and the ECM is in the dedicated PTO mode.
The engine is not in the cold mode.During the last 90 seconds of the PTO shutdown timer, the check engine lamp will begin flashing. If the vehicle is equipped with a PTO switch on lamp, the PTO switch on lamp will begin flashing during the last 90 seconds.If the PTO shutdown timer is activated and the timer stops the engine, the following event code will be generated.
71-14 (47)Note: Fuel rates are not monitored while the PTO shutdown timer is active. Shutdown will occur regardless of load. Unlike the idle shutdown timer, the PTO shutdown timer cannot be overridden by using the clutch pedal or the brake pedal.Note: A parameter can be programmed to allow the timer to be reset above a specified engine speed. When the parameter for the "PTO Shutdown Timer Maximum RPM" is programmed to a value below the top engine limit, the timer can be reset by increasing engine rpm above a programmed limit. The timer will stay reset until engine rpm drops below the programmed value. At this point, the timer will begin to count again. The factory default setting of 2120 rpm (top engine limit) disables this feature.Test Step 1. Verify Activation of the PTO Shutdown Timer
Connect Caterpillar Electronic Technician (ET) to the data link connector.
Access the customer parameters on Cat ET. Access the following display screens in order:
"Service"
"Configuration"
Record the programmed PTO shutdown time. The PTO shutdown time must be between 3 and 1440 minutes. If the PTO shutdown time is programmed to zero, the timer is disabled.
Start the engine. Allow the engine to warm up until the coolant temperature is 38 °C (100 °F). Allow the engine to operate at the programmed low idle and turn off any unnecessary accessory devices.
Ensure that all unnecessary loads are turned off.
Use the following procedure in order to check the operation of the PTO shutdown:
Park the vehicle.
Ensure that the PTO configuration is programmed to cab switches, remote switches or remote throttle.
Ensure that the status of the PTO On/Off switch is on.
Observe the status of the PTO shutdown.Note: The "PTO Shutdown Timer Maximum RPM" can be programmed in order to allow the timer to be reset by increasing engine rpm above the programmed limit. Ensure that the accelerator is not being depressed in order to increase rpm beyond the programmed limit.Expected Result:Result 1 The status of the parameter for PTO shutdown indicates "COUNTING".Result 2 The ECM is not reading the