KENR6933 111
Troubleshooting Section
•
Not OK – At least one intermittent fault was
indicated.
Repair: Repair the harness or the connector.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair elimin
ates the fault.
STOP.
i02490176
CAN Data Lin k Circu it - Test
System Operat
ion Description:
Use this procedure under the following
circumstance
s:
Use this procedure if another procedure has directed
you here. Use
this procedure if any of the following
diagnostic codes are active:
•
0247-09 SAE J
1939 Data Link abnormal update
rate
•
0247-12 SAE J
1939 Data Link failure
The following background information i s related
to this proce
dure:
The CAN Data Link is also known as J1939 Data Link.
Thedatalin
k is an industry standard for sending data
between different devices in the same application.
High speed d
ataistransferedviathedatalink.
The data link cannot be accurately tested without
complicated equipment. The data link requires a
resistanc
eof60Ohmsbetweenthetwowiresto
correctly transmit the data. This resistance is made
up of two 120 Ohm resistors. The two resistors are
known as “T
erminating Resistors”. The terminating
resistors should be at opposite ends of a data link
network. If this resistance is not present, then the
data will b
e intermittent or completely unreadable.
Note: The wiring for the J1939 data link is a shielded
twisted p
air cable. If the wiring is damaged the
replacement type must be shielded twisted pair cable.
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