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TM 9-2320-364-20-2
2-850
5. CODE 21: THROTTLE SENSOR INOPERATIVE.
INITIAL SETUP
1.
Go to Step 4 of this
fault.
START
YES
NO
“CHECK TRANS” light ON.
“DO NOT SHIFT” light OFF.
Transmission shifts delayed or
hard.
Throttle position sensor faulty.
Wire 908 faulty.
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
DDR test.
If signal count is not within 30 to
40 at full throttle and 205 to 225
at idle, ATEC ECU will register a
code 21 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)
DDEC Repair Kit (Item 15, 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)
Top engine access cover opened,
(TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Is throttle position sensor
(TPS) count within 30 to 40 at
full throttle and 205 to 225 at
idle?
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