TM 5-6675-250-10
3-2. TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRONIC CONTROL UNIT (Continued)
Step 2. Check for bad fuse.
a. Unscrew the cap on the fuse holder and remove the fuse.
b. Test fuse for continuity with an ohmmeter. Replace defective fuse.
c. Place the new fuse in the cap of the fuse holder. Insert fuse in ECU
panel, press, and turn the cap clockwise to secure the fuse holder.
Step 3. Check for a bad POWER-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 bad,
replace with a new lamp.
Place the new lamp in the socket of the lamp assembly. Screw the
c.
plastic lens in place over the lamp and tighten the plastic lens finger
tight.
Step 4. Check for a defective power cable.
a. Disconnect the power cable from the receptacle on the ECU and
power source.
b. Inspect power cable for damaged connectors and broken or frayed
wires and insulation. Replace damaged power cable.
c. Connect the power cable to the power source and ECU receptacle.
Step 5. 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.
3-3
Previous Page
