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TM 9-2320-364-20-2
2-854
5. CODE 21: THROTTLE SENSOR INOPERATIVE (CONT).
“CHECK TRANS” light ON.
“DO NOT SHIFT” light OFF.
“DO NOT SHIFT” light will not
go out at start up.
Transmission shifts delayed or
hard.
Throttle position sensor OK.
Wire 908 OK.
Wire(s) 104, 106A and 124
faulty.
DDEC ECM faulty.
Throttle position control faulty.
Transmission ECU faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If no signal count from throttle
position control module M4 to
ECU, ATEC ECU will register a
code 21 fault.
YES
NO
Repair wire(s) 104,
106A, and/or 124 (see
schematic Fig 2-22) or
notify DS
Maintenance.
Verify repair, go to
Step 6 of this Fault.
3.
Is continuity measured on
wires 104, 106A and 124
between connectors MC36
and MC10?
Go to Step 5 of this
Fault.
WARNING
Read WARNING
on Page 2-855
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