ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED LOW (VOLTAGE LOW) ALSO CALLED THROTTLE POSITION SENSOR (TPS) (cont) -726280723

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

22-8

Check for Signal Open

Install a jumper wire between

Less than

Go to 22-9.

sockets B and C of the TPS

or equal to 5 ohms.

connector.

Read resistance between sockets

Greater than

Signal line (ckt # 417) is open.

D2 and C3 on the vehicle harness

5 ohms or open.

and/or signal return (ckt #952)

connector.

is open. Repair open. If no

open was found, check ECM

terminals A3, D2, C3, and TPS

pins. Then go to 22-30.

22-9

Check ECM

Connectors

Check terminals at the

Terminals and

Replace ECM (para 7-57).

vehicle harness connector (both

connectors are okay.

Then go to 22-30.

the ECM and harness side) for

damage; bent, corroded, and

Problem found.

Repair terminals/connectors

unseated pins or sockets.

(para 7-101). Then go to 22-30.

22-10

Check for Short

Turn ignition off.

Less than or

The vehicle +5 volt line

Disconnect the vehicle harness

equal to 10,000 ohms.

(ckt #916) is shorted to the return

connector at the ECM.

line (ckt #952). Repair short.

Read resistance between sockets

Then go to 22-30.

A and C on the TPS connector.

Greater than

Go to 22--11.

10,000 ohms or open.

22-11

Check for Open

+5 Volt Line

Install a jumper wire between

Less than or

Go to 22-9.

sockets A and C of the TPS

equal to 5 ohms.

connector.

Read resistance between sockets

Greater than

The vehicle +5 volt line (ckt

A3 and C3 on the vehicle harness

5 ohms or open.

#916) is open. Repair open.

connector.

Then go to 22-30.

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