ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH (VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR (TPS) -726280713

TM 9-2320-364-20-1

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

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

J1587 CODE:

P91 3 -

ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH

(VOLTAGE HIGH) 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

21-1

Multiple Code Check

Were there any other active

No other active codes.

Go to 21-2.

codes besides 91/3?

Yes, any or all

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

of the following active

codes: 187/3, 91/4.

Yes - But none

Go to 21-2.

of the above.

21-2

Sensor Check

Turn ignition off.

Any code

Go to 21-3.

Disconnect TPS connector.

(except Code 91/3).

Turn ignition on.

Read active codes.

Code 91/3 (and any

Go to 21-7.

other codes).

21-3

Return Circuit

Check

Turn ignition off.

Less than or

Go to 21-4.

Install a jumper wire between pins

equal to 5 ohms.

B and C of the TPS harness

connector.

Greater than

Return line (ckt #952) and/or

Disconnect the vehicle harness

5 ohms open.

signal (ckt #417) is open.

connector at the ECM.

Repair open. Then go to 21-30.

Read resistance between sockets

D2 and C3 on the vehicle harness

connector.

21-4

Check TPS

Adjustment

Reconnect vehicle harness

Getting 64-205

Go to 21-6.

connector and plug TPS back in.

counts at no throttle and

Hook-up DDR to the DDL

less than 968 counts at

connector and select TPS CNTS.

full throttle.

Turn ignition on.

Read TPS Counts at both no

Not getting the above

Replace TPS (para 7-58).

throttle and full throttle.

reading.

Then go to 21-30.

2-643