Fault Code Guide

PTO Function Electrical Diagnosis
Test
No.
Test Procedure Test Result Action
4 In ServiceLink, open the "PTO Interlocks" Datalink Monitor
template.
Using Table 4, determine which PTO interlocks are used
based on the PTO reference parameter programmed in to the
BHM.
Engage the PTO using the switch in the dash.
Do any of the necessary interlocks drop out when the PTO
solenoid drops out?
Yes
Determine the cause for interlock
drop out and repair as necessary.
No
Check PTO solenoid output circuit
amperage. If it exceeds 0.85A, make
necessary repair or modification.
If amperage is OK, check for
mechanical problem.
5 In ServiceLink, open the "Chassis Module Battery Inputs"
Datalink Monitor template.
Is Battery Power Feed No. 3 at approximately battery
voltage?
Yes
The problem may be in the PTO
solenoid output circuit.
Make sure the PTO is wired to the
correct CHM output pin per the
ServiceLink CHM Configuration
screen.
Check PTO solenoid output circuit
from the CHM to the solenoid,
including the solenoid coil ground
circuit, for opens. If CHM solenoid
output circuit contains a relay, check
the relay and the rest of its circuits to
the solenoid.
Check the solenoid output circuit
between the CHM and solenoid (or
relay if equipped) for short to ground.
This will cause the CHM solenoid
output to shut off due to high current.
The current draw must not exceed
0.85A.
Check the solenoid. See
Section 42.19.
If all of the above is OK, replace the
CHM.
No
Check fuse 13 in the power
distribution module (PDM). If blown,
locate and correct the source of high
current.
If fuse 13 is OK, check wiring
between PDM fuse 13 and CHM pin
C4-J for open circuit.
Table 1, PTO Function Electrical Diagnosis
PTO and Pump Electrical Controls 54.38
Troubleshooting
Business Class M2 Workshop Manual, Supplement 22, September 2012300/2