5035695 JOHNSON *FILTER, FUEL

Illustration 1 g01129896
Schematic for the PTO inputs for the "Ramp Up/Ramp Down" mode of operationPlacing 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 Ramp Up/Down switch controls the desired engine speed.The PTO Ramp Up/Down switch is spring loaded to the normally open position. When the switch is held in the "Ramp Up" position, the desired engine speed increases according to the value of the "Engine Accel Rate" parameter. When the switch is released, the desired engine speed maintains the set speed. After the desired engine speed has been set, momentarily placing the switch in the "Ramp Up" position increases the desired engine speed by 20 rpm.When the PTO Ramp Up/Down switch is held in the "Ramp Down" position, the desired engine speed decreases according to the value of the "Engine Accel Rate" parameter. When the switch is released, the desired engine speed maintains the set speed. After the desired engine speed has been set, momentarily placing the switch in the "Ramp Down" position decreases the desired engine speed by 20 rpm.If the "PTO Ramp Up" and "PTO Ramp Down" inputs are connected to the −Battery at the same time, the ECM will ignore the inputs. The desired engine speed will not change."Set/Resume" ModeThis mode uses four inputs. The inputs are provided by three switches. Refer to Illustration 2.
Illustration 2 g01105373
Schematic for the PTO inputs for the "Set/Resume" mode of operationPlacing 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.
The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.
Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 3 g01146374
Left side engine view (typical example) (1) J1/P1 ECM connector
Illustration 4 g01146383
Left side engine view (typical example) (2) P61 Customer connector
Thoroughly inspect connectors (1) and (2). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 5 g01102468
P1 terminals that are associated with the PTO (P1-41) PTO interrupt switch (P1-56) PTO enable switch (P1-58) PTO ramp up switch (set) (P1-60) PTO ramp down switch (resume)
Illustration 6 g01123458
J61/P61 terminals that are associated with the PTO (19) PTO interrupt switch (29) PTO enable switch (30) PTO ramp up switch (set) (39) PTO ramp down switch (resume)
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuits for the PTO switches.
Check the allen head screw on each ECM connector and the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
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 - The connectors and wiring are OK. If the engine is equipped with a customer connector, proceed to Test Step 2. Otherwise, proceed to Test Step 3.
Not OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Inputs from the Switches at the J61 Customer Connector
Disconnect the J61 connector.
Refer to Table 1. Connect a voltage test lamp between the input for the suspect switch circuit and J61-31 +Battery.