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Page Title: ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED LOW (VOLTAGE LOW) 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:
22
J1587 CODE:
P91 4 -
ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH
(VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR
(TPS)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
22-12
Check for Short
to Battery +
Turn ignition off.
All readings are
Go to 22-13.
Pull out both DDEC circuit breakers
greater than 10,000
(CB22 & CB23).
ohms or open.
Disconnect 5-way power harness
connector at the ECM.
Any reading is
A short exists between sockets
Read resistance between sockets
less than or equal
where less than 10,000 ohms
D2 and B3 on the vehicle harness
to 10,000 ohms.
resistance was read. Repair
connector.
short and reset circuit breakers.
Also read resistance between
Then go to 22-30.
socket D2 on the vehicle harness
connector and the following
sockets on the 5-way power
harness connector: B, C, D, & E.
22-13
Check for Outside
DDEC Battery +
Turn ignition off.
All readings
Go to 22-9.
Remove ECM 5-way power
less than 4.0 volts.
harness connectors.
Remove vehicle harness
Either reading
Outside power is shorted to
connector.
greater than or equal
either (ckt #952) or (ckt #916).
Turn ignition on.
to 4.0 volts.
Repair short. Then go to
Read voltage A3 (red lead) to a
22-30.
good ground (black lead).
Read voltage C3 (red lead) to a
good ground (black lead).
22-30
Verify Repairs
Turn ignition off.
No codes.
Repairs are complete.
Reconnect all connectors.
Turn ignition on.
Code 91/4 (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
light.
find the error.
If "Check Engine" light does not
stay on, start engine and run
Any other codes
Go to START-1, pg 2-539, to
(TM 9-2320-364-10) until
except Code 91/4.
service other codes.
"Check Engine" light comes on or
1 minute. Stop engine.
Read all codes.
2-655

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