EDGE AS 1882388 - Caterpillar

PTO Mode 1PTO mode 1 uses the following switch inputs:
"PTO Enable"
"Ramp Up"
"Ramp Down"If the PTO enable switch is in the ON position, the throttle position sensor is disabled and the desired engine speed is controlled by the PTO ramp up/down switch. The ramp up input and the ramp down input cannot be connected to the -Battery at the same time. If this occurs, the Electronic Control Module (ECM) will generate a diagnostic code and the ECM will make no adjustments to the desired engine speed when the unit is in the PTO mode.Note: The ECM will use the selected speed that is higher when the ECM chooses between the throttle input or the PTO input. When the switch is toggled, the engine will respond according to the PTO rpm ramp rate that is programmed. When the switch is opened, the engine will maintain the current desired engine rpm. "Opened" in this case means that the switch is in the center position.PTO Mode 2PTO mode 2 uses the following switch inputs:
"PTO Enable"
"Set (Ramp up)"
"Resume (Ramp down)"
"PTO Interrupt""Set (ramp up)"
If the input is momentarily connected to -Battery, the desired engine speed will be set to the current engine speed.
If the input is connected to -Battery and held in that position, the desired engine speed will increase at the PTO ramp rate that is programmed.
If this input is connected momentarily to -Battery and after the desired engine speed has been set, the desired engine speed will increase by 20 rpm."Resume (ramp down)"
If this input is momentarily connected to -Battery, the desired engine speed will be set to the last known value that was used during operation of the PTO.
If this input is connected to -Battery and held in that position, the desired engine speed will decrease at the rate that is programmed for "Engine Accel. Rate".
After the desired engine speed is set, momentarily connecting this input to -Battery will decrease the engine speed in increments of 20 rpm.
Illustration 1 g00751867
Schematic for PTO switches in PTO mode 1 "Ramp Up/Ramp Down"
Illustration 2 g00751903
Schematic for PTO switches in PTO mode 2 "Set/Resume"
Illustration 3 g00743407
Terminal locations for customer connector
Illustration 4 g00743410
Terminal locations for ECM connectorTest Step 1. Check the Electrical Connectors and the Wiring
Place the engine control in the OFF/RESET mode and thoroughly inspect the J61/P61 customer connector, and J1/P1 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the customer connector and the ECM connector that are associated with the suspect switch circuits.
Check the J61/P61 customer connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.Check the ECM connector J1/P1 for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK -