(Table 69, contd)
Troubleshooting Test Steps Values Results
9. Create a Short Circuit at the Harness Connector for the
GCU
A. Turn the keyswitch to the OFF position.
B. Disconnect the GCU.
C. Fabricate a jumper wire that is 15 cm (6 inch) long.
D. Install the jumper wire between pin 5 and pin 8 on the har-
ness connector for the GCU.
E. Turn the keyswitch to the ON position.
F. Use the electronic service tool to override the glow plug
starting aid.
G. Check for active diagnostic codes.
H. Use the electronic service tool to turn off the glow plug start-
ing aid.
I. Turn the keyswitch to the OFF position.
J. Remove the jumper wire.
Diagnostic
codes
Result: A 676-6 diagnostic code is active with the jumper
installed.
Install a replacement GCU.
Use the electronic service tool to override the glow plug starting
aid and verify that the repair eliminates the fault.
Clear all logged diagnostic codes.
Result: A 676-5 diagnostic code is active with the jumper
installed.
Proceed to Test Step 10.
10. Check the Resistance Between the GCU and the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the GCU. Disconnect the P1/J1 connector.
C. Measure the resistance between pin 8 on the harness con-
nector for the GCU and P1:52.
Less than 5
Ohms
Result: The measured resistance is not within the expected
range.
There is an open circuit or high resistance in the wiring between
pin 8 on the harness connector for the GCU and P1:26.
Inspect the 9-pin engine interface connector. Repair the faulty
wiring or replace the faulty wiring.
Result: The measured resistance is within the expected range.
Contact the Dealer Solution Network (DSN).
11. Create an Open Circuit at the GCU Harness Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the GCU.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to override the glow plug
start aid.
E. Check for active diagnostic codes.
F. Use the electronic service tool to turn off the glow plug start
aid.
G. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: A 676-5 diagnostic code is active with the GCU
disconnected.
Install a replacement GCU.
Use the electronic service tool to override the glow plug starting
aid and verify that the repair eliminates the fault.
Clear all logged diagnostic codes.
Result: A 676-6 diagnostic code is active with the GCU
disconnected.
Proceed to Test Step 12.
(continued)
136 UENR0612
Circuit Tests
This document has been printed from SPI2. NOT FOR RESALE
To Next Page
