3817146 Volvo.Penta Housing

Illustration 1 g01383115
Schematic for the PTO inputs for the "Ramp Up/Ramp Down" 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 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 g01383123
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.
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
Remove the electrical power from the ECM.
Illustration 3 g01388291
Location of the ECM connectors (typical engine view)
(1) J1/P1 connectors
Thoroughly inspect connector (1). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 4 g01383146
P1 terminals that are associated with the PTO
(P1-41) Input from the PTO interrupt switch
(P1-56) Input from the PTO enable switch
(P1-58) Input from the PTO ramp up switch or set switch
(P1-60) Input for PTO ramp down switch or resume switch
Illustration 5 g01389270
Terminals at the customer connector that are associated with the PTO
(19) Input from the PTO interrupt switch
(29) Input from the PTO enable switch
(30) Input from the PTO ramp up switch or set switch
(39) Input for PTO ramp down switch or resume switch
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 for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
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 or 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 customer connector.
Refer to Table 1. Connect a voltage test lamp between the input for the suspect switch circuit and terminal J61-31.
Table 1
J61 Terminals for the Inputs from the PTO Switches
Switch J61 Terminals
PTO enable switch