ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED LOW (VOLTAGE LOW) ALSO CALLED THROTTLE POSITION SENSOR (TPS) (cont) -726280725

TM 9-2320-364-20-1

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

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