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TM 9-2320-364-20-1
2-14. DDEC III/IV TROUBLESHOOTING (CONT).
Section IV. TROUBLESHOOTING CHARTS (Cont.)
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/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.

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