Fault Code Guide

PTO and Fire Pump Control J1939 Fault Codes
SA SPN FMI Description Action
33 6954 07 End of Frame (PTO and fire pump
control)–no air pressure feedback
Solenoid is not activated, but CHM senses that the
pressure switch is in an unexpected state. For
example, a normally closed solenoid is off, but air
pressure is detected.
Check the following:
• Air system
• Pressure feedback circuit including the
ground.
• Solenoid–pressure switch may be stuck.
6955 07 End of Frame (PTO and fire pump
control)–unexpected air pressure feed-
back
Chassis Module engages solenoid, but the pressure
switch does not change status indicating that the so-
lenoid supplied, or exhausted, air downstream.
Check the following:
• Air system
• Pressure feedback circuit including the
ground.
• Solenoid–pressure switch may be stuck.
Table 7, PTO and Fire Pump Control J1939 Fault Codes
PTO and Pump Electrical Controls 54.38
Troubleshooting
Business Class M2 Workshop Manual, Supplement 22, September 2012 300/9