Fault Code Guide

See Fig. 1 for a typical wiring diagram of an Allison
hydraulic PTO.
See Fig. 2 for a typical wiring diagram of an Allison
hydraulic PTO with a 4th generation TCU.
See Fig. 3 for a typical wiring diagram of a pneu-
matic PTO.
See Fig. 4 for a typical wiring diagram of a split shaft
PTO.
Chassis
Module
Bulkhead
Module
To Ignition
(vehicle dash)
PTO
Solenoid
Pressure
Switch
ON
f544722
Splice Pack
200
200E
200D
200D
J1939
Smart
Switch
Relay
Hydraulic
Hydraulic
Electric/
02/17/2006
Fig. 1, Typical Wiring Diagram of an Allison Hydraulic PTO
PTO and Pump Electrical Controls 54.38
Specifications
Business Class M2 Workshop Manual, Supplement 22, September 2012 400/1