User's Manual

Fault Isolation Procedures
1-5
Fault
Codes
Hand-Held Codes
Description Type of Code Driving TechniqueSID FMI
21 7 2 Right Turn Signal System Key on. If the fault is present, the
system should automatically detect the
problem and set the code. If the fault
is not present at key on, operate the
vehicle and attempt to duplicate the
driving conditions that triggered the
fault code. Possible triggers include
heat and vibration.
22 8 2 Left Turn Signal System Key on. If the fault is present, the
system should automatically detect the
problem and set the code. If the fault
is not present at key on, operate the
vehicle and attempt to duplicate the
driving conditions that triggered the
fault code. Possible triggers include
heat and vibration.
23 3 2 Brake Input Signal System Key on. Apply service brake for
a minimum of 8 seconds. If the
fault is present, the system should
automatically detect the problem and
set the code. If the fault is not present at
key on, operate the vehicle and attempt
to duplicate the driving conditions
that triggered the fault code. Possible
triggers include heat and vibration.
24 6 2 Speed Input Signal System Select a forward gear and drive at a
steady speed no slower than 10 MPH.
It may be necessary to operate the
vehicle for a prolonged period of time
if the cause of failure is related to heat
and vibration.
25, 32 231 2,12,14 J-1939 Data Link Signal System Key on. If the fault is present, the
system should automatically detect the
problem and set the code. If the fault
is not present at key on, operate the
vehicle and attempt to duplicate the
driving conditions that triggered the
fault code. Possible triggers include
heat, vibration, and varying levels of
throttle demand. It may take up to 75
seconds to set this fault.