P174 3 - FUEL TEMPERATURE CIRCUIT FAILED HIGH (HIGH VOLTAGE)

TM 9-2320-364-20-1

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

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

J1587 CODE:

P174 3 - FUEL TEMPERATURE CIRCUIT FAILED HIGH (HIGH VOLTAGE)

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.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

23-1

Sensor Check

Turn ignition off.

Code 174/4 and/or

Go to 23-2.

Disconnect FTS sensor connector

any codes except

(para 7-62) and install a jumper

Code 174/3.

wire between the FTS connector

sockets A and B.

Anything except

Go to 23-4.

Turn ignition on.

Code 174/4.

Read active codes.

23-2

Check for Short to

+5 Volt Line

Turn ignition off.

Less than or

Signal line (ckt #472) is shorted

Remove jumper wire.

equal to 10,000 ohms.

to the engine +5 volt line (ckt

Disconnect the engine harness

#416), and/or (ckt #472) signal

connector at the ECM.

is shorted to (ckt #452) sensor

Read resistance between sockets

return, and/or ground. Repair

R3 and W1 on the engine harness

short. Then go to 23-30.

connector.

Greater than

Go to 23-3.

10,000 ohms or open.

23-3

Check FTS Connectors

Inspect terminals at the FTS

Terminals and

Replace FTS (para 7-62).

connectors (both the sensor and

connectors are okay.

Then go to 23-30.

harness side) for damage; bent,

corroded, and unseated pins or

Problem found.

Repair terminals/connectors

sockets.

(para 7-101). Then go to 23-30.

23-4

Open Line Check

Turn ignition off.

Less than or

Go to 23-5.

Disconnect the engine harness

equal to 5 ohms.

connector at the ECM.

Read resistance between sockets

Greater than

Signal line (ckt #472) or return

R3 and Y2 on the engine harness

5 ohms or open.

line (ckt #452) is open. Repair

connector.

open. Then go to 23-30.

2-657