(1) Loosen screw and disconnect ATEC
ECU harness connector MC9.
(2) Set multimeter select switch to ohms.
(3) Is there continuity on wire 215
between relay R9, terminal 85 and
terminal 3H at ATEC ECU connector
(a) If there is no continuity, repair
wire 215 (see schematic Fig 2-41)
or notify DS Maintenance.
(b) If there is continuity, replace
ATEC ECU (Para 7-71).
(4) Connect connector MC9 and
(5) Install two ECB covers and 15 screws.
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical
circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.
Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23 and relays R3, R13 - R19, R26, R28, R32, R33
are always electrically hot and can cause severe injury to personnel. Care must be exercised when
working under the electrical circuit board cover.
Relay test must be performed with relay