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)
17-5
Check for Short to
+5 Volt Line
Turn ignition off.
Less than or equal
Signal line (ckt#907) is
Disconnect the engine
to 10,000 ohms.
shorted to the +5 Volt line
harness connector at the
(ckt#416). Repair short.
ECM.
Then go to 17-30.
Read resistance between
cavities W1(416) and
Greater than
Go to 17-6.
R1 (907) on the engine
10,000 ohms or open.
harness connector.
17-6
Check for Short to
Battery
Remove both fuses to the
All readings are
Go to 17-7.
ECM.
greater than 10,000 ohms
Disconnect the vehicle harness
or open.
and 5 way power harness
connectors at the ECM.
Any reading is less than
A short exists between the
Read resistance between cavity
or equal to 10,000 ohms
cavities where less than 10,000
R1 (ckt#907) of the engine harness
ohms resistance was read.
connector and cavity 83(439) of
Repair short and reinsert
the vehicle harness connector.
fuses (or reset circuit breakers).
Also read resistance between
Then go to 17-30.
cavi ty R1 (ckt#907) of the engine
harness connector and cavities
A and C on the 5 way power
harness connector.
17.7
Check ECM Connectors
Inspect terminals at ECM
Terminals and connectors
Reprogram ECM. Then go to
(sensor side and ECM side)
are okay.
17-30.
for damaged; bent, corroded,
and unseated pins
Problem found.
Repair terminals/connectors.
or sockets.
Then go to 17-30.
Change 3 3-345.219
