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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
24
J1587 CODE:
P174 4 - FUEL TEMPERATURE CIRCUIT FAILED LOW (LOW 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 was started at step START-1, pg H-25 and you have now been referred here.
STEP/SEQUENCE
24-1
Multiple Code Check
Were there any other active
codes besides Code 174/4?
24-2
Sensor Check
Turn ignition off.
Disconnect FTS connector.
Start engine and run
(TM 9-2320-360-10) until
"Check Engine" light comes on or
for 8 minutes.
Read active codes with engine
still running.
24-3
Check FTS Connectors
Inspect terminals at the FTS
connectors (both the sensor and
harness side) for damage; bent,
corroded, and unseated pins or
sockets.
24-4
Open Line Check
Turn ignition off.
Disconnect the engine harness
connector at the ECM.
Read resistance between sockets
R3 and Y2 on the engine harness
connector.
Also read resistance between
socket B of FTS connector and
a good ground.
RESULT
WHAT TO DO NEXT
No other codes.
Go to 24-2.
Yes, any or all
Go to VEH5V-1 (page H-247).
of the following codes:
110/3, 175/3, 174/3,
102/3, 187/4, 91/4, 100/4,
102/4, 110/4, 175/4.
Yes - but none
Go to 24-2.
of the above.
Code 174/3 (or any
other codes except
Code 174/4).
Code 174/4 (and any
other codes).
Go to 24-3.
Go to 24-4.
Terminals and
connectors are okay.
Problem found.
Replace FTS (para 7-33).
Then go to 24-30.
Repair terminals/connectors
(para 7-77). Then go to 24-30.
Less than or
equal to 10,000 ohms
on either reading.
Signal line (ckt #472) is shorted
to the return line (ckt #452) or
battery ground. Repair short.
Then go to 24-30.
Greater than
10,000 ohms or open
on both readings.
Go to 24-5.
H-157
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