Section 4
TROUBLESHOOTING
E. CODE 46 . LOW BATTERY VOLTAGE
NOTE — This chart is onfy to be used if:
1) All basic mechanical checks and physical inspections have been performed with no probtem found, and
2) Diagnosis of DDEC-II was started at step Start-1 (page 3-121) and you have now been referred here.
46.1 Battery Check
l Start and run engine for 1 minute.
l Measure voltage on Battery +
terminal to Battery -
terminal.
46.2 Voltage Check at ECM
l Keep engine running.
l Select ECM INPUT VOLT
(Mode 5) on the DDR for display.
l observe ECM voltage reading on
DDR.
46-3 Voltage Check at ECM
Harness
l Turn ignition off.
. Disconnect the 6-way power
harness connector at the ECM.
l Read voltage from socket E, F,
A and B of the 6-way
power harness connector and a
good battery ground.
Don’t use ckt#150 as the ground
reference.
Engine does not start. —
Less than or
equal to 10.0 wits.
Greater than
10.0 volts.
L e s s t h a n o r —
equal to 10.0 volts.
G r e a t e r t h a n —
10.0 volts.
L e s s t h a n o r —
equal to 11.5 volts.
G r e a t e r t h a n —
11.5 volts.
TM 9-2320-363-20-1
WHAT TO DO NEXT
- Determine cause for no-start.
Start with an inspection of the
battery (possibly discharged)
and/or starting/charging system.
Refer to Chart 2, page 3-141, as a
further aid in no-start diagnosis if
the battery and starting/ charging
system are okay. .
-Service discharged battery and/
or starting/charging system.
-Go to 46-2.
-Go to 46-3.
-Go to 46-5.
-Go to 46-4.
- -Go to 46-5.
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