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Diagnostics
Table 8: Pneumatic Control Unit Faults (continued)
J1939 SPN
SPN
Description
441
Auxiliary
Temperature #1
442
Auxiliary
Temperature #2
168
Battery
Potential/
Power Input 1
Page 34
J1939 FMI
FMI
Symptom
Description
System not
operative.
Data Valid But
Above Normal
0
Range - Most
Severe Level.
System not
operative.
Voltage Above
Normal, or
System not
3
Shorted to High
operative.
Source.
Meritor Maintenance Manual MM-0997 (Revised 12-09)
Cause
Component
Temperature
sensor #1
High manifold
detected above
temperature.
normal operating
temperature.
Temperature
sensor #2
High manifold
detected above
temperature.
normal operating
temperature.
Supply voltage
Overvoltage
above normal
condition.
operating range.
Section 4
Action
Wait until
temperature is
reduced.
External
heating
situation must
be addressed.
Wait until
temperature is
reduced.
External
heating
situation must
be addressed.
Vehicle supply
voltage
issues, such
as alternator
problems
must be
resolved.
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