114 KENR6933
Troubleshooting Section
Results:
•
OK – The other devices are operating correctly.
Restart the diagnostic process. STOP.
•
Not OK – The other devices are not working
correctly.
Repair: Use the appropriate service tools in order
to diagnose other devices on the data link.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair elimi
nates the fault.
STOP.
i02656282
Data Link Circuit - Test
System Opera
tion Description:
Use this procedure under the following
circumstanc
es:
Use this procedure if the electronic service tool will
not communic
ate with the Electronic Control Module
(ECM) through the data link.
The followin
g background information is related
to this procedure:
The data lin
k is the standard data link that is used by
the ECM in order to communicate with the electronic
service tool.
The ECM provides multiple connections for the data
link. The technician must ensure that the correct
connector
is being tested. The connection that is
used is dependent on the application.
If the diag
nostic connector is on the engine, the
positive data link signal will be from P2:21 to J23:D.
The negative data link signal will be from P2:20 to
J23:E.
If the diagnostic connector is off the engine, the
positive
data link signal will be from P1:23 to pin “D”
of the diagnostic connector. The negative data link
signal will be from P1:24 to pin “E” of the diagnostic
connecto
r.
The following information refers to the pin number.
Ensure th
at the correct connector is used.
Communication
The electronic service tool may indicate the following
error message:
The version of the ECM is not recognized and the
integrity of t
he changed parameters and displayed
data is not guaranteed.
This message w
ill indicate that the version of the
software that is in the electronic service tool is not
the same version of the software that is in the ECM.
Install the l
atest version of the electronic service tool
software in order to rectify the fault.
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