TM 5-6675-250-20
2 - 1 0 . T R O U B L E S H O O T I N G ( C o n t i n u e d)
T a b l e 2 - 3 . T r o u b l e s h o o t i n g ( C o n t i n u e d )
M A L F U N C T I O N
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRONIC CONTROL UNIT
1 . E C U S W I T C H E S I N O P E R A T I V E.
Step 1.
Check for loose knobs.
a. Rotate knob (1).
b.
If knob turns without operating switch, tighten setscrews (2).
S t e p 2. C h e c k f o r d e f e c t i v e s w i t c h e s.
a. Disconnect power cables (1, 2 and 3) from ECU (4).
b. Replace existing ECU with one that is operable. If system operates
correctly with new ECU, this indicates original was defective.
c. Reconnect power cables (1, 2 and 3) to ECU (4).
d. Report defective ECU to Direct Support Maintenance.
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