Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect Page 1 of 12
FAULT CODE 319
Real-Time Clock Power Interrupt - Data Erratic,
Intermittent or Incorrect
Overview
CODE REASON EFFECT
Fault Code: 319 Real-Time Clock Power Interrupt - None on performance. Data in
PID: P251 Data Erratic, Intermittent or the ECM will not have accurate
SPN: 251 Incorrect. Real-time clock lost time and date information.
FMI: 2/2 power.
LAMP: Amber
(Maintenance
Flashout)
SRT:
Real-Time Clock Power Circuit
Circuit Description
Under ordinary operating conditions, the real-time clock in the electronic control module
(ECM) is powered by the vehicle's batteries. If battery power to the ECM is lost, then the
real-time clock will be powered by a battery in the engine harness (if equipped).
Component Location
The real-time clock battery is secured to the engine harness near the ECM. Refer to
Procedure 100-002 for a detailed component location view.
Shop Talk
This fault indicates that the real-time clock in the ECM lost power. Possible causes for this
fault are weak or failed real-time clock battery, failed wiring or connectors between the
battery and ECM, or the engine is not equipped with a real-time clock battery and the
vehicle battery power to the ECM is lost.
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Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect Page 2 of 12
Cautions and Warnings
CAUTION
To reduce the possibility of damaging a new ECM, all other active fault
codes must be investigated prior to replacing the ECM.
CAUTION
To reduce the possibility of pin and harness damage, use the following
test leads when taking a measurement:
Part No. 3822758 - male Deutsch/AMP/Metri-Pack test lead
Part No. 3822917 - female Deutsch/AMP/Metri-Pack test lead.
Troubleshooting Steps
STEPS SPECIFICATIONS
STEP 1. Check the real-time clock battery
and connections.
STEP 1A. Inspect the ECM and Dirty or damaged pins?
engine harness connector pins.
STEP 1B. Check the real-time Between 3.3 and 3.6 VDC?
clock battery voltage at the ECM
harness connector.
STEP 1B-1. Inspect the real-time
clock battery and engine wire
harness connector pins.
STEP 1B-2. Check the real-time
clock battery voltage at the battery
module connector.
STEP 2. Check the battery module
harness.
STEP 2A. Check for an open Less than 10 ohms?
circuit in the engine harness.
STEP 2B. Check for a short circuit More than 100k ohms?
in the engine harness.
STEP 2C. Check for a short circuit More than 100k ohms?
to ground.
STEP 3. Clear the fault codes.
STEP 3A. Disable the fault code. Fault Code 319 inactive?
STEP 3B. Clear the inactive fault All fault codes cleared?
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codes.
Guided Step 1 - Check the real-time clock battery and
connections.
Guided Step 1A - Inspect the ECM and engine harness connector pins.
Conditions
z Turn keyswitch OFF.
z Disconnect the engine harness
from the ECM.
Action
Inspect the engine harness and ECM
connector pins for the following:
z Loose connector
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 damage
z Connector shell broken.
For general inspection techniques, refer
to Component Connector and Pin
Inspection, Procedure 019-361.
Dirty or damaged pins? Dirty or damaged pins?
YES NO
A defective connection has been detected No Repair
in the sensor harness connector.
Clean the connector and pins.
Repair the damaged pins harness,
connector, or pins if possible.
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Refer to Procedure 019-043.
Go to 3A Go to 1B
Guided Step 1B - Check the real-time clock battery voltage at the ECM
harness connector.
Conditions
z Engine
equipped
with optional
real-time
clock battery.
z Turn
keyswitch
OFF.
z Disconnect
the engine
harness from
the ECM.
Action
Measure the
voltage between
the real-time clock
battery SUPPLY
pin and the real-
time clock battery
RETURN (-) pin at
the ECM
connector of the
engine harness.
Refer to the wiring
diagram for
connector pin
identification.
Between 3.3 and 3.6 Between 3.3 and 3.6 VDC?
VDC?
YES NO
No Repair No Repair
Go to 3A Go to 1B-1
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Guided Step 1B-1 - Inspect the real-time clock battery and engine wire
harness connector pins.
Conditions
z Turn keyswitch OFF.
z Disconnect the real-time clock
battery from the engine harness.
Action
Inspect the real-time clock battery and
engine harness connector pins for the
following:
z Loose connector
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 damage
z Connector shell broken.
For general inspection techniques, refer
to Component Connector and Pin
Inspection, Procedure 019-361.
Dirty or damaged pins? Dirty or damaged pins?
YES NO
A defective connection has been detected No Repair
in the sensor or harness connector.
Repair or replace the real-time clock
battery or engine harness.
Refer to Procedure 019-311 or 019-043.
Go to 3A Go to 1B-2
Guided Step 1B-2 - Check the real-time clock battery voltage at the battery
module connector.
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Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect Page 6 of 12
Conditions
z Engine
equipped
with optional
real-time
clock battery.
z Turn
keyswitch
OFF.
z Disconnect
the real-time
clock battery
from the
engine
harness.
Action
Measure the
voltage between
the real-time clock
battery SUPPLY
pin and the real-
time clock battery
RETURN (-) pin at
the real-time clock
battery connector.
Refer to the wiring
diagram for
connector pin
identification.
Between 3.3 and 3.6 Between 3.3 and 3.6 VDC?
VDC?
YES NO
No Repair Replace the real-time clock battery.
Refer to Procedure 019-311.
Go to 2A Go to 3A
Guided Step 2 - Check the battery module harness.
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Guided Step 2A - Check for an open circuit in the engine harness.
Conditions
z Turn
keyswitch
OFF.
z Disconnect
the engine
harness from
the ECM.
Action
Measure the
following
resistance:
z The
resistance
between the
real-time
clock battery
SUPPLY pin
at the battery
connector of
the engine
harness to
the real-time
clock battery
SUPPLY pin
at the ECM
harness
connector
z The
resistance
between the
real-time
clock battery
RETURN (-)
pin at the
battery
connector of
the engine
harness to
the real-time
clock battery
RETURN (-)
pin at the
ECM
harness
connector.
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Refer to the wiring
diagram for
connector pin
identification.
For general
resistance
measurement
techniques, refer
to Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
Less than 10 Less than 10 ohms?
ohms?
YES NO
No Repair An open circuit has been detected in the engine harness.
Repair or replace the engine harness.
Refer to Procedure 019-043.
Go to 2B Go to 3A
Guided Step 2B - Check for a short circuit in the engine harness.
Conditions
z Turn
keyswitch
OFF.
z Disconnect
the engine
harness from
the ECM.
z Disconnect
the real-time
clock battery
from the
engine
harness.
Action
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Using a
multimeter,
measure the
resistance from
the real-time clock
battery SUPPLY
pin at the ECM
connector of the
engine harness to
all other pins in the
connector.
Refer to the wiring
diagram for
connector pin
identification.
For general
resistance
measurement
techniques, refer
to Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
More than 100k More than 100k ohms?
ohms?
YES NO
No Repair A short circuit has been detected in the engine harness.
Repair or replace the engine harness.
Refer to Procedure 019-043.
Go to 2C Go to 3A
Guided Step 2C - Check for a short circuit to ground.
Conditions
z Turn
keyswitch
OFF.
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Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect Page 10 of 12
z Disconnect
the engine
harness from
the ECM.
z Disconnect
the real-time
clock battery
from the
engine
harness.
Action
Using a
multimeter,
measure the
resistance from
the real-time clock
battery SUPPLY
pin at the ECM
connector of the
engine harness to
engine block
ground.
Refer to the wiring
diagram for
connector pin
identification.
For general
resistance
measurement
techniques, refer
to Resistance
Measurements
Using a Multimeter
and Wiring
Diagram,
Procedure 019-
360.
More than 100k More than 100k ohms?
ohms?
YES NO
No Repair A short circuit has been detected in the engine harness.
Repair or replace the engine harness.
Refer to Procedure 019-043.
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Go to 3A Go to 3A
Guided Step 3 - Clear the fault codes.
Guided Step 3A - Disable the fault code.
Conditions
z Connect all components.
z Connect INSITE™ electronic
service tool.
Action
Disable the fault code.
z Use INSITE™ electronic service
tool to set real-time clock to the
correct date and time.
z Verify that Fault Code 319 is
inactive.
Fault Code 319 inactive? Fault Code 319 inactive?
YES NO
No Repair Return to the troubleshooting steps or
contact a local Cummins Authorized Repair
Location if all steps have been completed
and checked a second time.
Go to 3B Go to 1A
Guided Step 3B - Clear the inactive fault codes.
Conditions
z Connect all components.
z Turn keyswitch ON.
z Connect INSITE™ electronic
service tool.
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Action
Clear the inactive fault codes.
z INSITE™ electronic service tool to
erase the inactive fault codes.
All fault codes cleared? All fault codes cleared?
YES NO
No Repair No Repair
Repair complete. Appropriate troubleshooting steps
Last Modified: 30-Jan-2006
Copyright© 2006
Cummins, Inc.
All rights reserved
12:56:14 2007-07-20
