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TM 9-2320-364-20-2
2-856
5. CODE 21: THROTTLE SENSOR INOPERATIVE (CONT).
4.
Replace DDEC II
ECM (Para 7-56) or
DDEC III ECM (Para
7-57). Verify repair,
go to Step 6 of this
Fault.
YES
NO
“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 OK.
DDEC ECM faulty.
Throttle position control faulty.
Transmission ECU faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If there is no pulse modulated
signal count from throttle
position control module M4
terminal B to transmission ECU,
ATEC ECU will register a code
21 fault.
WARNING
Are 9.0 to 10.5 vdc measured
on wire 908 at TPC module?
Read WARNING
on Page 2-857
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