(Table 218, contd)
Troubleshooting Test Steps
Values Results
6. Check the Wiring Between the Suspect Component and
the 31-Pin Connector for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the 31-pin connector and the connector for the
suspect component.
C. Use a multimeter to check the resistance between the sig-
nal terminal on the 31-pin connector and all other terminals in
the 31-pin connector. Check the resistance between the signal
terminal on the 31-pin connector and a known good ground.
D. Use a multimeter to check the resistance between the re-
turn terminal on the 31-pin connector and all other terminals in
the 31-pin connector. Check the resistance between the return
terminal on the 31-pin connector and a known good ground.
Short circuit Result: One of the measured resistances is less than 1
k Ohms. There is a fault in the wiring between the 31-pin
connector and the suspect component.
Repair: Repair or replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All measured resistances are greater than 1 k
Ohms.
Proceed to Test Step 7.
7. Check the Wiring Between the 31-Pin Connector and
the Dosing Control Unit (DCU) for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the 31-pin connector and the DCU connector.
C. Use a multimeter to check the resistance between the sig-
nal terminal on the 31-pin connector and the signal terminal
on the DCU connector.
Refer to Illustration 144 .
D. Use a multimeter to check the resistance between the re-
turn terminal on the 31-pin connector and the return terminal
on the DCU connector.
Refer to Illustration 144 .
E. Reconnect the connectors.
Open circuit Result: One of the measured resistances is greater than
2 Ohms - There is a fault in the wiring between the 31-
pin connector and the DCU connector.
Repair: Repair or replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All measured resistances are less than 2 Ohms.
Proceed to Test Step 8.
8. Check the Wiring Between the 31-Pin Connector and
the Dosing Control Unit (DCU) for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the 31-pin connector and the DCU connector.
C. Use a multimeter to check the resistance between the sig-
nal terminal on the 31-pin connector and all other terminals in
the 31-pin connector. Check the resistance between the signal
terminal on the 31-pin connector and a known good ground.
D. Use a multimeter to check the resistance between the re-
turn terminal on the 31-pin connector and all other terminals in
the 31-pin connector. Check the resistance between the return
terminal on the 31-pin connector and a known good ground.
Short circuit Result: One of the measured resistances is less than 1
k Ohms. There is a fault in the wiring between the 31-pin
connector and the DCU connector.
Repair: Repair or replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All measured resistances are greater than 1 k
Ohms.
Contact the Dealer Solutions Network (DSN).
408 UENR4469-36
Circuit Tests
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