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Section 4
TM 9-2320-360-20-3
TROUBLESHOOTING CHARTS
E. FLASH CODE:
23
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 was started at step START-1, pg H-25 and you have now been referred here.
STEP/SEQUENCE
23-1
Sensor Check
Turn ignition off.
Disconnect FTS connector and
install a jumper wire between
the FTS connector sockets A
and B.
Turn ignition on.
Read active codes.
23-2
Check for Short to
+5 Volt Line
Turn ignition off.
Remove jumper wire.
Disconnect the engine harness
connector at the ECM.
Read resistance between sockets
R3 and W1 on the engine harness
connector.
23-3
Check FTS Connectors
Inspect terminals at the FTS
connectors (both the sensor and
harness side) for damage; bent,
corroded, and unseated pins or
sockets.
23-4
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.
RESULT
WHAT TO DO NEXT
Code 174/4 and/or
any codes except
Code 174/3.
Go to 23-2.
Anything except
Code 174/4.
Go to 23-4.
Less than or
equal to 10,000 ohms.
Signal line (ckt #472) is shorted
to the engine +5 volt line (ckt
#416), and/or (ckt #472) signal
is shorted to (ckt #452) sensor
return and/or ground. Repair
short. Then go to 23-30.
Go to 23-3.
connectors are okay.
Replace FTS (para 7-33).
Then go to 23-30.
Repair terminals/connectors
(para 7-77). Then go to 23-30.
Less than or
Go to 23-5.
equal to 5 ohms.
Greater than
5 ohms or open.
Signal line (ckt #472) or return
line (ckt #452) is open. Repair
open. Then go to 23-30.
H-153
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