Fault Code Guide

PTO and Fire Pump Control Switch and Interlocks Test
Test
No.
Test Procedure Test Result Action
2 Are any of the five SSn ID#s equal to 0? Yes Go to test no. 5.
No Go to test no. 3.
3 In ServiceLink, open the "Switch Expansion Module 1, Smart
Switches" Datalink Monitor template.
Look at each of the six SEM to BHM outputs: SS1 ID#, SS2
ID#, SS3 ID#, SS4 ID#, SS5 ID#, and SS6 ID#.
If diagnosing the PTO, are any of the five SSn ID#s equal to
38?
If diagnosing the fire pump controls, are any of the five SSn
ID#s. equal to 104?
Yes
Go to test no. 6.
No
Go to test no. 4.
4 Are any of the six SSn ID#s. equal to 0? Yes Go to test no. 5.
No
Repeat test no. 3 using the next
SEM template. For example,
"Switch Expansion Module 2,
Smart Switches."
5 Is fault code 164 s022 07 active?
Yes
Check the following and make
the necessary repairs:
• Check if PTO or PUMP
smart switch is installed
and connected.
• Check smart switch wir-
ing.
• Check the smart switch.
• If the smart switch is in-
stalled in SEM, check
SEM.
No
The PTO or fire pump controls
smart switch is not programmed
for the vehicle. Check and apply
the proper 26-01032-xxx refer-
ence parameter.
6 Toggle the PTO smart switch on and off several times while
observing the Datalink Monitor template which shows SSn ID#
equal to 38 for PTO diagnosis, or 104 for fire pump controls
diagnosis.
If using the Smart Switches template, look for a change under
the "BHM Inputs" heading in the input voltage for the smart
switch.
If using one of the Switch Expansion Modules templates
under "SEM to BHM" heading, look for a change in the state
of the "SSn Pos" annunciator for the smart switch.
Is there a change in voltage or state when toggling the PTO
switch?
Yes
Go to test no. 7.
No
Check the following and make
necessary repairs:
• Check smart switch wir-
ing.
• Check the smart switch.
• If the smart switch is in-
stalled in SEM, check
SEM.
PTO and Pump Electrical Controls 54.38
Troubleshooting
Business Class M2 Workshop Manual, Supplement 22, September 2012300/6