Table 149
Diagnostic Trouble Codes for the CAN Data Link Circuit
J1939
Code
PDL
Code
Code Description
(code descriptions may vary)
Comments
639-9 247-9 J1939 Network #1 : Abnormal Update Rate Another controller has incorrectly stopped transmitting an expected
J1939 message or another controller has incorrectly started transmit-
ting a conflicting J1939 message.
The ECM will log the diagnostic code.
The engine will not start.
1235-9 5856-9 J1939 Network #3 : Abnormal Update Rate The Pump and Electronics Unit (PEU), the ammonia sensor, the soot
sensor, or a NOx sensor has incorrectly stopped or started transmit-
ting a data request.
The ECM will log the diagnostic code.
3360-9 3820-9 Aftertreatment #1 DEF Controller : Abnormal Up-
date Rate
The Dosing Control Unit (DCU) has incorrectly stopped or started
transmitting a data request.
This diagnostic code applies to the CAN A datalink.
The ECM will log the diagnostic code.
The following background information is related
to this procedure:
The CAN data links are also known as J1939 data
links. A data link is an industry standard for sending
data between different devices in the same
application.
High-speed data is transferred via the data links. The
data links cannot be accurately tested without
complicated equipment. The data links require a
resistance of 60 Ohms between the two wires to
transmit the data correctly. This resistance is made
up of two 120 Ohm resistors. The two resistors are
known as “Terminating Resistors” . The terminating
resistors should be at opposite ends of a data link
circuit. If this resistance is not present, then the data
will be intermittent or unreadable.
Note: The wiring for a J1939 data link is a shielded
twisted-pair cable. If the wiring is damaged, the
replacement type must be shielded twisted-pair
cable.
272 UENR4469-36
Circuit Tests
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