STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
87
J1587 CODE:
P 73
4 - PUMP PRESSURE CIRCUIT FAILED LOW. (BELOW)
P108 4 - BAROMETRIC PRESSURE CIRCUIT FAILED LOW . (TBD)
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.
87-1
Multiple Code Check
Were there any other active codes
No other codes.
Go to 87-2.
besides Code 73-4?
Yes, 73-3.
Go to VEH5V-1, pg 3-345.419.
Yes - but not 73-3.
Go to 87-2.
87-2
Sensor Check
Turn ignition off.
Code 73-3 (and any .
Check to be sure the ECM and
Disconnect the PGC sensor
code except Code 73-4.
PGC sensor connectors are wired
connector and install a jumper
properly. If wired properly, go to
between sockets B and C of the
87-3.
PGC sensor connector.
Turn ignition on.
Code 73-4 (and any
Go to 87-4.
Start engine and operate the PGC
other codes).
in the "PRESSURE" mode.
Read ACTIVE CODES.
No codes.
Go to 87-4.
87-3
Check PGC Sensor
Connectors
Turn ignition off.
Terminals and
Replace PGC sensor. Then go
Inspect terminals at the PGC
connectors okay.
to 87-30.
sensor connectors (sensor and
harness side) for damaged, bent,
Problem found.
Repair terminals/connectors.
corroded, and unseated pins or
Then go to 87-30.
sockets.
Change 3 3-345.403
