POWER TAKE-OFF (PTO)
Peterbilt Motors Company 8-14
FIGURE 8-22. Interlock Example Diagram
If the Cab ECU detects the switch in the on position and if applicable, the park brake interlock is validated by the Cab
ECU, the Cab ECU will send a mux signal to the chassis node via F-CAN. The EOA valve will be the same number as on
the dash switch. Electronic Service Application (ESA) can be used to add or remove the PTO engage park brake
interlock. Depending on the application and the PTO type, the switches and wiring may differ.
FIGURE 8-23. PTO Control Example Diagram
For single acting PTO, the chassis node will energize the coil on the EOA valve allowing air to engage the PTO.
For dual acting PTO, the PTO's pilot valve will provide the air function to switch the air between engage and dis-
engage.
If the PTO is a forward/reverse PTO:
A protected PTO forward and a protected PTO reverse switch will be present in the dash. Each switch
controls a separate EOA solenoid, each solenoid is dedicated to either forward or reverse.
If the Cab ECU detects both the forward and reverse switches in the on position the Cab ECU will ignore the switch input
for the second switch thrown and provide a message in the cluster display informing the operator of the non-valid switch
configuration.
