Fault Code 441 Battery 1 Voltage - Data Valid But Below Normal Operational Range - Moderately Severe Level
Fault Code 441 Battery 1 Voltage - Data Valid But Below Normal Operational Range - Moderately Severe Level
Fault Code 441 Battery 1 Voltage - Data Valid But Below Normal Operational Range - Moderately Severe Level
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Circuit Description
The ECM receives constant voltage from the batteries through the unswitched battery wires
that are connected directly to the positive (+) battery post. There is one 30-amp fuse in the
unswitched battery wires to protect the OEM harness. In marine applications this is a 25
ampere fuse on 12V systems and a 15 ampere fuse on 24V systems. The ECM receives
switched battery input through the vehicle keyswitch wire when the vehicle keyswitch is
turned on. The battery return wires are connected directly to the negative (-) battery post.
Component Location
The ECM is located on the intake side of the engine. The ECM is connected to the battery
by the OEM harness. This direct link provides a constant power supply for the ECM. In
marine applications only circuits 1 and 3 are used for unswitched battery. The location of
the battery will vary with the OEM. Refer to the OEM manual for battery location.
Shop Talk
This fault code is logged when the ECM battery supply voltage drops below 6 volts.
z Verify that the ECM unswitched power is coming from the batteries and not the
starter or other device. Check for possible weak batteries.
z If the ECM unswitched battery supply is taken from the starter, check for low voltage
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during cranking. Low voltage during cranking can cause the ECM power supply to
drop below specifications and log Fault Code 441.
WARNING
Batteries can emit explosive gases. To reduce the possibility of
personal injury, always ventilate the compartment before servicing the
batteries. To reduce the possibility of arcing, remove the negative (-)
battery cable first and attach the negative (-) battery cable last.
CAUTION
To reduce the possibility of pin and harness damage, use the following
test lead when taking a measurement:
Part Number 3822758 - male Deutsch/AMP/Metri-Pack test lead.
Troubleshooting Steps
STEPS SPECIFICATIONS
STEP 1. Check the battery.
STEP 1A. Check the battery Connections tight and corrosion-free?
connections.
STEP 1B. Check the battery Battery voltage acceptable in normal
voltage. and cranking conditions?
STEP 2. Check the fuse.
STEP 2A. Verify that the fuse is Fuse installed correctly?
installed correctly.
STEP 2B. Check for a blown fuse. Fuse blown?
STEP 3. Check the OEM power harness.
STEP 3A. Inspect the OEM power Dirty or damaged pins?
harness and ECM connector pins.
STEP 3B. Check for an open Less than 10 ohms?
circuit.
STEP 3C. Check for a short circuit Greater than 100k ohms?
in the power harness.
STEP 3D. Check for a short circuit Greater than 100k ohms?
to ground.
STEP 3E. Check for a short circuit Greater than 100k ohms?
from pin to pin.
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Conditions
Action
Go to 1B Go to 4A
Conditions
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z Turn
keyswitch
ON.
Action
z Measure the
voltage from
the positive
(+) battery
terminal to
the negative
(-) battery
terminal
while trying
to start
engine.
Normal conditions:
z At least 12
VDC (12-
VDC
systems)
z At least 24
VDC (24-
VDC
systems).
Cranking
conditions:
z At least 6.2
VDC (12-
VDC
systems)
z At least 12
VDC (24-
VDC
systems).
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Go to 2A Go to 4A
Conditions
z Turn
keyswitch
OFF.
Action
z Inspect the
30-amp fuse
for correct
installation.
Go to 2B Go to 4A
Conditions
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Action
Go to 4A Go to 3A
Guided Step 3A - Inspect the OEM power harness and ECM connector pins.
Conditions
Action
z Corroded pins
z Bent or broken pins
z Pushed back or expanded pins
z Moisture in or on the connector
z Missing or damaged connector
seals
z Dirt or debris in or on the
connector pins
z Wire insulation damaged
z Connector shell broken.
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Go to 4A Go to 3B
Conditions
z Turn
keyswitch
OFF.
z Disconnect
the OEM
power
harness
connector
from the
ECM.
Action
z Measure the
resistance
from the
positive (+)
battery
terminal post
to all ECM
battery
SUPPLY (+)
pins, one at
a time, in the
OEM power
harness
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ECM
connector.
z Measure the
resistance
from the
negative (-)
battery
terminal post
to all ECM
battery
SUPPLY (-)
pins, one at
a time, in the
OEM power
harness
ECM
connector.
For general
resistance
measurement
techniques, refer
to the Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
Go to 3C Go to 4A
Conditions
z Turn
keyswitch
OFF.
z Disconnect
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the OEM
power
harness
connector
from the
ECM.
z Disconnect
the battery.
Action
z Measure the
resistance
from the
ECM battery
SUPPLY (+)
pins in the
OEM power
harness
ECM
connector to
the ECM
battery
SUPPLY (-)
pins.
For general
resistance
measurement
techniques, refer
to the Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
Go to 3D Go to 4A
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Conditions
z Turn
keyswitch
OFF.
z Disconnect
the OEM
power
harness
connector
from the
ECM.
Action
z Measure the
resistance
from the
ECM battery
SUPPLY (+)
pins in the
OEM power
harness
ECM
connector to
engine block
ground.
For general
resistance
measurement
techniques, refer
to the Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
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Go to 3E Go to 4A
Conditions
z Turn
keyswitch
OFF.
z Disconnect
the OEM
power
harness
connector
from the
ECM.
z Disconnect
the OEM
harness
connector
from the
ECM.
z Disconnect
the battery.
Action
z Measure the
resistance
from one of
the ECM
battery
SUPPLY (+)
pins in the
OEM power
harness
ECM
connector to
all pins in the
OEM
harness
ECM
connector.
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z Measure the
resistance
from the
second ECM
battery
SUPPLY (+)
pin in the
OEM power
harness
ECM
connector to
all pins in the
OEM
harness
ECM
connector.
For general
resistance
measurement
techniques, refer
to the Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
Go to 3F Go to 4A
Guided Step 3F - Check the add-on or accessory wiring at the positive (+)
terminal of the battery.
Conditions
Action
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Go to 4A Go to 4A
Conditions
Action
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No Repair No Repair
Go to 4B Go to 1A
Conditions
Action
Copyright© 2005
Cummins, Inc.
All rights reserved
12:54:03 2007-07-20