STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 46
J1587 CODE:
P168 1 - BATTERY VOLTAGE LOW
46-4
Check for Bad Battery
+ Line
Remove both ECM fuses.
Less than or
The Battery + line near
Read voltage at socket A of one
equal to 11.5 volts on
Battery is open, or a corroded
fuseholder (red lead) to a good
either reading.
connection exists at Battery +
ground (black lead).
terminal. Repair problem.
Repeat voltage reading at
Then go to 46-30.
other fuseholder.
Greater than
The Battery + line between the
11.5 volts on both
fuseholder and ECM has an
readings.
open, or ECM power connector
has a corroded connection.
Repair problem. Then go to
46-30.
46-5
Ground Check at
ECM
Disconnect the 5-way power
Less than or
The ground wire (ckt #150) is
harness connector at ECM (if
equal to 11.5 volts on
open or has a corroded
you have not previously done so).
either reading.
connection. Repair ground wire.
Read voltage on socket C
Then go to 46-30.
of 5-way power harness connector
(red lead) to socket (black lead).
Greater than
Go to 46-6.
Also read voltage on socket A (red
11.5 volts on both
lead) to socket D (black lead).
readings.
46-6
Check ECM Connectors
Check terminals at ECM 5-way
Terminals and
Replace ECM
Then to 42-6.
power harness connector (both
connectors are okay.
the ECM and harness side) for
damage; bent, corroded, and
Problem found
Repair terminals/connectors
unseated pins or sockets.
Then go to 46-30.
Change 3 3-345.341
