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

TM 9-2320-364-20-1

2-14. DDEC III/IV TROUBLESHOOTING (CONT).

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

J1587 CODE:

P91 4 -

ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED LOW

(VOLTAGE LOW) 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/IV was started at step START-1, pg 2-539, and you have now been referred here.

NOTE - Checks at the TPS connector must be made at MC6, not at the connector on the electronic throttle.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

22-1

Multiple Code Check

Were there any other active

No other active codes.

Go to 22-2.

codes besides 91/4?

Yes, any or all

Go to VEH5V-1 (page 2-767).

of the following codes:

187/3, 91/3.

Yes - But none

Go to 22-2.

of the above.

22-2

Sensor Check

Turn ignition off.

Code 91/4 and/or

Go to 22-6.

Disconnect the TPS

other codes.

connector.

Install a jumper wire between

sockets B and C of the TPS

Code 91/3 (and any

Go to 22-3.

harness connector.

other codes).

Turn ignition on.

Read active codes.

22-3

Check TPS Adjustment

Remove jumper and reconnect

Getting 64-205

Go to 22-5.

TPS.

counts at no throttle and

Hook-up DDR to the DDL

less than 968 counts at

connector and select TPS

full throttle.

CNTS.

Read TPS Counts at both no

Not getting the

Replace TPS (para 7-58).

throttle and full throttle.

above readings.

Then go to 22-30.

2-649