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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 21
J1587 CODE: P 9 1 3-
ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH
(VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR
(TPS)
NOTE - This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-III was started at step START-1, pg H-25 and you have now been referred here.
NOTE - Checks at the TPS connector must be made at MC36, not at the connector on the electronic throttle.
21-1
Multiple Code Check
Were there any other active
codes besides 91/3?
21-2
Sensor Check
Turn ignition off.
Disconnect TPS connector.
Turn ignition on.
Read active codes.
21-3
Return Circuit
Check
Turn ignition off.
Install a jumper wire between pins
A and B of the TPS harness
connector.
Disconnect the vehicle harness
connector at the ECM.
Read resistance between sockets
D2 and C3 on the vehicle harness
connector.
21-4
Check TPS
Adjustment
Reconnect vehicle harness
connector and plug TPS back in.
Hook-up DDR to the DDL
connector and select TPS CNTS.
Turn ignition on.
Getting 64-205
Go to 21-6.
counts at no throttle and
less than 968 counts at
full throttle.
Read TPS Counts at both no
Not getting the above
throttle and full throttle.
reading.
RESULT
WHAT TO DO NEXT
No other active codes.
Yes, any or all
of the following active
codes: 187/3, 91/4.
Go to 21-2.
Go to VEH5V-1 (page H-247).
Yes - But none
of the above.
Go to 21-2.
(except Code 91/3).
Go to 21-3,
Code 91/3 (and any
Go to 21-7.
Less than or
equal to 5 ohms.
Go to 21-4.
Greater than
5 ohms open.
Return line (ckt #952) and/or
signal (ckt #417) is open. Repair
open. Then go to 21-30.
Replace TPS (Electronic
Throttle) (para 7-28). Then go
to 21-30.
H-139
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