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Page Title: ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH (VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR (TPS) (cont)
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TM 9-2320-364-20-1
Section IV. TROUBLESHOOTING CHARTS (Cont.)
E. FLASH CODE:
21
J1587 CODE:
P91 3 -
ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH
(VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR
(TPS)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
21-5
(Deleted)
21-6
Check TPS
Connectors
Inspect terminals at the TPS
Terminals and
Replace TPS (Electronic Throttle)
connectors (sensor side and
connectors are okay.
(para 7-58). Then go to 21-30.
harness side) for damage; bent,
corroded, and unseated pins of
Problem found.
Repair terminals/connectors
sockets.
(para 7-101). Then go to 21-30.
21-7
Check for Short
Turn ignition off.
Less than or
Signal line (ckt #417) is shorted
Disconnect the vehicle harness
equal to 10,000 ohms.
to the vehicle + 5 volt line (ckt
connector at the ECM.
#916). Repair short. Then go to
Read resistance between sockets
21-30.
D2 and A3 on the vehicle harness
connector.
Greater than
Go to 21-8.
10,000 ohms or open.
21-8
Check for Short to
Battery +
Disconnect batteries (para 7-90).
All readings are
Go to 21-9.
Disconnect the vehicle harness
greater than 10,000 ohms
and 5-way power harness
or open.
connectors at the ECM.
Read resistance between socket
Any reading is
A short exists between the
D2 of the vehicle harness
less than or equal to
sockets where less than 10,000
connector and socket B3 of the
10,000 ohms.
ohms resistance was read.
vehicle harness connector.
Repair short. Then go to
Also read resistance between
21-30.
socket D2 on the vehicle harness
connector and the following
sockets on the 5-way power
harness connector: A and C.
2-645

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