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TM 9-2320-364-20-2
2-870
7. CODE 23: SHIFT SELECTOR.
INITIAL SETUP
1.
Repair wire 210A (see
schematic Fig 2-22) or
notify DS
Maintenance.
Verify repair, go to
Step 7 of this Fault.
START
YES
NO
“CHECK TRANS” light ON.
Restricted gear shifts.
Torque converter lockup clutch
unlocked.
Transmission does not shift
properly or stays in N
(Neutral).
Shift selector wire 210A faulty.
Open ground wire to electrical
control box.
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 not present to shift
selector keypad through wire
210A from ECU, ATEC will
register a code 23 fault.
2-15. ATEC TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Reader, Diagnostic (Item 53, Appendix G)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Left rear skirt removed, (Para 17-34)
Wheels turned fully to the right,
(TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Is continuity measured on
wire 210A between connector
MC9, terminal 2C and
connector MC12, terminal 1?
WARNING
Read WARNING
on Page 2-871
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