STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E.
FLASH CODE:
21
J1587 CODE:
P91 3 · ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH (VOLTAGE
HIGH)
ALSO CALLED THROTTLE POSITION SENSOR (TPS)
21-9
Check ECM
Connectors
Check terminals at the ECM
Terminals and
Reprogram ECM. Then go to
vehicle harness connector (both
connectors are okay.
21-30.
the ECM and harness side) for
damage; bent, corroded and
Problem found.
Repair terminals/connectors.
unseated pins or sockets.
Then go to 21-30.
21-30
Verify Repairs
Turn ignition off.
(No codes).
Repairs are complete.
Reconnect all connectors.
Turn ignition on.
Code 91/3 (and
All system diagnostics are
Clear codes.
any other codes).
complete. Please review this
Note status of "Check Engine"
section from the first step to find
light.
the error.
If "Check Engine" light does not
stay on, start engine and run until
Any other codes
Go to START-1, pg 3-345.41,
"Check Engine" light comes on
except Code 91/3.
to service other codes.
or 1 minute. Stop engine.
Read all codes.
Change 3 3-345.235
