RENR5042-02 165 Troubleshooting Section g01105373 Illustration 81 Schematic for the PTO inputs for the “Set/Resume” mode of operation Placing the PTO Enable switch to the “Enable” position transfers the control of the desired engine speed from the throttle position sensor to the PTO speed control function. The PTO Interrupt switch momentarily transfers control back to the throttle position sensor. The PTO Set/Resume switch controls the desired engine speed. The PTO Set/Resume switch is spring loaded to the normally open position. If the switch is momentarily placed in the “Set” position, the desired engine speed will be set to the current engine speed.
If the switch is held in the “Set” position, the desired engine speed will increase according to the value of the “Engine Accel Rate” parameter. After the desired engine speed has been set, the desired engine speed will increase by 20 rpm when the PTO ramp up/down switch is momentarily placed in the “Set” position. If the PTO Set/Resume switch is momentarily placed in the “Resume” position, the desired engine speed will be set to the current engine speed. If the switch is held in the “Resume” position, the desired engine speed will decrease according to the value of the “Engine Accel Rate” parameter.
After the desired engine speed has been set, the desired engine speed will decrease by 20 rpm when the switch is momentarily placed in the “Resume” position. If the “PTO Set” and “PTO Resume” inputs are connected to the −Battery at the same time, the ECM will ignore the inputs. The desired engine speed will not change. Test Step 1. Inspect the Electrical Connectors and the Wiring g01120532 Illustration 82 Left side view A. Turn the keyswitch to the OFF position. (1) P61 customer connector (1) J1/P1 ECM connectors