(Table 150, contd)
Troubleshooting Test Steps
Values Results
If one of the terminating resistors is incorrect, replace the
faulty terminating resistor.
If the two terminating resistors are between 110 and 130
Ohms, proceed to Test Step 4.
Result: The resistance is greater than 150 Ohms.
Proceed to Test Step 3.
Result: The resistance is between 50 and 70 Ohms
The resistance is correct. The fault may be in the connection
to other devices on the data link.
Proceed to Test Step 3.
3. Check the Data Link Wiring
A. Disconnect each of the connectors that connect other devices
on the data link.
B. Use a multimeter to measure the resistance between P1:25
and each of the CAN+ pins on other devices on the CAN A data
link.
C. Use a multimeter to measure the resistance between P1:25
and pin (G) on the diagnostic connector.
D. Use a multimeter to measure the resistance between P1:26
and each of the CAN- pins on other devices on the CAN A data
link.
E. Use a multimeter to measure the resistance between P1:26
and pin (F) on the diagnostic connector.
F. Use a multimeter to measure the resistance between P1:17 to
each of the CAN+ pins on other devices on the CAN C data link.
G. Use a multimeter to measure the resistance between P1:18 to
each of the CAN- pins on other devices on the CAN C data link.
Less than 2
Ohms
Result: At least one of the resistance measurements is
greater than 2 Ohms - there is an open circuit or high resist-
ance in the wiring.
Repair: Repair the connectors or the harness and/or replace
the connectors or the harness.
Ensure that all seals are correctly in place and ensure that
the connectors are correctly connected.
Use the electronic service tool to clear all logged diagnostic
codes and then verify that the repair has eliminated the fault.
Result: All measured resistances are less than 2 Ohms.
Proceed to Test Step 4.
4. Check the Other Devices on the CAN Data Link
A. Use the appropriate service tools to diagnose other devices on
the data link.
Other devi-
ces are OK
Result: At least one of the other devices is not operating
correctly.
Repair: Use the appropriate service tools to repair other de-
vices on the data link.
Use the electronic service tool to clear all logged diagnostic
codes and then verify that the repair eliminates the fault.
Result: The other devices are operating correctly.
Contact the Dealer Solutions Network (DSN).
UENR4469-36 275
Circuit Tests
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