Table 2-29. ECB/ATEC Wire Harness
(1) Suspect wire(s) in electrical control
box wire harness could be faulty from
connector MC50 to terminal 85 of the
following relay(s): RETARDER relay
R8, C.K. TRANS relay R9, REVERSE
relay R10, NEUTRAL START
(2) Is there continuity on wire 211
between connector MC50, terminal B
and relay R8, terminal 30?
(a) If there is no continuity, repair
wire (see schematic Fig 2-21) or
notify DS Maintenance.
(b) If there is continuity, wire is OK.
(c) If all wires are OK, perform
Steps (4) and (5) below and
replace shift selector (Para 8-2).
Go to Step 6 of this Fault.
(3) Repeat Step (2) for relays and
terminals listed in Table 2-29.
(4) Connect connector MC50.
(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.
Electrical control box connector MC50,
terminal F interfaces with dash lighting
circuits in cab through wire 1052. Go to
Electrical Troubleshooting (Para 2-20)
if problem with lighting controls or
illumination at shift selector.