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Observe all gauges during the initialization period. Then pick the symptom in Table
5-4 that best describes what you see.
SMC Fails Initialization
No pointer movement, message center
does not display the odometer, and no
message center illumination.
No pointer movement,message center
does display the odometer.
SMC Passes Initialization But—
Speedometer and odometers are both
inaccurate.
Speedometer is inaccurate (odometers
okay).
Odometers are inaccurate (speedome-
ter okay).
Odometer does not advance.
Odometer advances when PTO is
engaged and vehicle is stopped.
Speedometer does not change speed
when two-speed axle is engaged.
Engine Hours display shows 0 or does
not advance.
Pointer sweeps back and forth.
Message center missing segments, has
no illumination, or does not display
anything.
Clock gains or loses time.
No audible warning or clock alarm.
Probable Cause
Action
Power connection to
Go to Section 5.4.1 on
SMC.
page 5-20.
Defective SMC.
Replace the SMC.
Engine ECU not cali-
Go to Section 5.4.2 on
brated; 2-speed axle
page 5-21.
switch engaged.
Defective SMC.
Replace the SMC.
Go to Section 5.4.3 on
page 5-21.
Defective SMC.
Replace the SMC.
PTO input to SMC
Go to Section 5.4.4 on
open.
page 5-22.
Two-speed axle input
Go to Section 5.4.5 on
to SMC open.
page 5-23.
Engine ECU not send-
Go to Section 5.4.6 on
ing data.
page 5-24.
Various causes.
Go to Section 5.5 on
page 5-25.
Defective SMC.
Replace the SMC.
Defective SMC.
Replace the SMC.
Defective SMC.
Replace the SMC.
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