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TM 9-2320-364-20-2
2-872
7. CODE 23: SHIFT SELECTOR (CONT).
2.
Repair wire(s) 230
and/or 234 (see
schematic Fig 2-20) or
notify DS
Maintenance.
Verify repair, go to
Step 7 of this Fault.
YES
NO
“CHECK TRANS” light ON.
Restricted gear shifts.
Torque converter lockup clutch
unlocked.
Transmission does not shift
properly or stays in N
(Neutral).
Wire 210A is OK.
Ground wire 230/234 to
electrical control box faulty.
Short/open in ATEC ECU wire
harness.
Short/open in control box wire
harness.
Shift selector faulty.
Transmission ECu faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If ground is faulty, shift selector
keypad will not operate
correctly. ATEC will register a
code 23 fault.
WARNING
Is continuity measured on
wires 230 and 234 between
connector MC12, terminals 10
and 14 and a known good
ground?
Read WARNING
on Page 2-873
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