TM 5-6675-250-10
3-2. TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRONIC CONTROL UNIT (Continued)
b. Replace a defective GRU with a new one by disconnecting and
connecting power cables.
c. Report defective GRU to the next higher level of maintenance.
Check for a defective ECU.
Step 5.
Replace existing ECU with an ECU that is operable. If the system
a.
operates correctly with the new ECU, this indicates the original ECU
was defective.
b.
Replace a defective ECU with a new one by disconnecting and
connecting power cables.
c.
Report defective ECU to the next higher level of maintenance.
6. BRAKE ON INDICATOR FAILS TO LIGHT WHEN MODE SELECT SWITCH IS PLACED TO BRAKE ON.
Step 1.
Check for a defective BRAKE ON indicator lamp.
a. Unscrew the plastic lens from the indicator lamp assembly.
b. Visually inspect lamp for a burned out filament. If filament is defec-
tive replace with a new lamp.
c.
Place the new lamp in the socket of the lamp assembly. Screw the
plastic lens in place over the lamp and tighten the plastic lens finger
tight.
Step 2.
Check for a defective ECU.
a.
Replace existing ECU with an ECU that is operable. If the system
operates correctly with the new ECU, this indicates the original ECU
was defective.
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