STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E.
FLASH CODE: 17
J1587 CODE:
P723 - BYPASS POSITION 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 3-345.41 and you have now been referred here.
18-1
Multiple Code Check
Were there any other active
No other codes.
Go to 18-2.
codes besides 72/4?
Yes, any or all
Go to ENG5V-1 pg 3-345.413.
of the following codes:
110/3or4, 175/3or4,
174/3or4, 72/3,
102/3or4, 100/3or4,
94/3or4, 73/3or4,
Yes - But none
Go to 18-2.
of the above.
18-2
Sensor Check
Turn ignition off.
Code 72/3 (and any
Go to 18-3.
Disconnect BPS connector.
other codes except
Install a jumper wire between
72/4).
sockets B and C of the BPS
harness connector.
Code 72/4 (and any
Go to 18-4.
Turn ignition.
other codes).
Read active codes.
If active Code 72/3or4 exists go
to RESULT column.
If no active Codes 72/3or4 exists,
start engine and run until either
the "Check Engine" light comes
on or the engine has been running
warm for at least one minute at
greater than 1000 RPM.
Read active codes.
18-3
Check BPS Connectors
Inspect terminals at BPS
Terminals and connectors
Replace BPS. Then go to
connectors (sensor side and
are okay.
18-30.
ECM side) for damaged; bent,
corroded, and unseated pins
Problem found.
Repair terminals/connectors.
or sockets.
Then go to 18-30.
Change 3 3-345.223
