STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 38
J1587 CODE: P94 4 - FUEL PRESSURE CIRCUIT FAILED LOW
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 3-345.41 and you have now been referred here.
38-0 Multiple Code Check
Check Fuel Filter
Are fuel filters plugged?
Yes.
Replace Fuel Filters.
Then go to 38-30.
No.
Go to 38-1.
38-1 Multiple Code Check
Were there any other active
No other codes.
Go to 38-2.
codes besides Code 94/4?
Yes, any or all
Go to ENG5V-1, page 3-345.
of the following codes:
413.
110/3 or 4, 175/3 or 4,
174/3 or 4, 100/3 or 4,
94/3 or 4, 101/3 or 4.
Yes - but none
Go to 38-2.
of the above.
38-2 Sensor Check
Turn ignition off.
Code 94/3 (and any
Check to be sure ECM and FPS
Disconnect FPS connector and
codes except Code 94/4.
connectors are wired properly.
Install a jumper wire between
If wired properly then go to 38-3
sockets B and C of the FPS
harness connector.
Code 94/4 (and any
Go to 38-4.
Turn ignition on.
other codes).
Read active codes.
If active Code 94/3 or 4 exists,
No codes.
Go to 38-4.
go to RESULT column.
If no active Code 94/3 or 4 exists,
start and run engine until either
active Code 94/3 or 4 appears or
engine temperature COOLANT
TEMP OIL on DDR) has been
greater than 60 degrees C (140
deg F) for more than 1 minute.
Change 3 3-345.303
