Fault Code Guide

PTO and Fire Pump Control Switch and Interlocks Test
Test
No.
Test Procedure Test Result Action
7 In ServiceLink, open one of the following Datalink Monitor
templates:
• If testing the PTO controls, open the "PTO Interlocks"
template.
• If testing fire pump controls, open the "Fire Pump Inter-
locks" template.
Using Table 4 for PTO controls or Table 5 for fire pump con-
trols, determine which interlocks are used based on the refer-
ence parameter programmed into the BHM.
While attempting to engage the PTO or fire pump using the
switch in the dash, are all of the interlocks associated with the
reference parameter met?
Yes
Reapply the PTO or fire pump
control reference parameter.
If the PTO or fire pump control
continues to be inoperable, con-
tact the Freightliner Customer
Assistance Center at 1-800-FTL-
HELP or 1-800-385-4357. There
may be an error in the reference
parameter.
No
Determine the reason for the in-
terlock not being met. Either re-
pair the problem or advise the
driver of proper operation.
Table 3, PTO and Fire Pump Control Switch and Interlocks Tests
PTO Interlocks by Reference Parameter
Reference
Parameter
*
Description
Interlocks
Neutral (from transmission)
Ignition
(BHM input)
Park Brake
(from
CHM)
J1939
Current Gear
J1939 Selected
Gear
26-01032-003
PTO End of Frame Air Control, w/Ign
Interlock (Smart Switch ID#38)
——On—
26-01032-005
PTO End of Frame Air Control, w/Neut
& Ign Interlocks (Smart Switch ID#38)
Neutral Neutral On —
26-01032-008
PTO End of Frame Air Control, AGS
†
Trans (Smart Switch ID#38)
— — On Set
26-01032-014
PTO End of Frame Air Control, w/Neut
Interlock (Smart Switch ID#38)
Neutral Neutral On —
26-01032-019
PTO End of Frame Air Control, w/Park
Brk Interlock (Smart Switch ID#38)
— — On Set
26-01032-020
PTO End of Frame Air Cont,AGS
Trans,Prk Brk & Neut Intlocks (Smart
Switch ID#38)
Neutral Neutral On Set
*
For a given reference parameter, all the interlocks for that parameter must be in the state shown in order for the PTO solenoid to engage.
†
The AGS and AGS2 designations refer to the same Mercedes-Benz transmission. References to AGS2 may be found in ServiceLink.
Table 4, PTO Interlocks by Reference Parameter
PTO and Pump Electrical Controls 54.38
Troubleshooting
Business Class M2 Workshop Manual, Supplement 22, September 2012 300/7