
Navigate to the following menu options in the
electronic service tool in order to access the
“
Glow
Plug Starting Aid Override
”
:
• Diagnostics
• Diagnostic Tests
• Override Parameters
Table 69
Troubleshooting Test Steps
Values
Results
1. Inspect Electrical Connectors and Wiring
A. Check the fuses.
B. Inspect the terminals on the GCU. Refer to Troubleshoot-
ing, “Electrical Connector - Inspect” for details.
C. Inspect the connectors between the GCU and the glow
plugs.
D. Inspect the terminals on the P1/J1 ECM connector and all
other connectors associated with the glow plug circuit.
E. Perform a 30 N (6.7 lb) pull test on each of the wires in the
ECM connector that are associated with glow plug circuit.
F. Check the harness for abrasion and for pinch points from
the glow plugs to the GCU, and from the GCU to the ECM.
Damaged wire
or connector
Result:
A damaged wire or damaged connector was found. A
fuse is blown.
Repair the damaged wire or the damaged connector. Replace
any blown fuses
Use the electronic service tool to clear all logged diagnostic co-
des. Verify that the repair eliminates the fault.
Result:
All connectors, pins, and sockets are correctly con-
nected and/or inserted and the harness is free of corrosion, of
abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes or Logged Diagnos-
tic Codes
A. Connect the electronic service tool to the diagnostic
connector.
B. Turn the keyswitch to the ON position. Do not start the
engine.
C. Use the electronic service tool to override the glow plug
start aid.
D. Check for active diagnostic codes or recently logged diag-
nostic codes.
E. Use the electronic service tool to turn off the glow plug start
aid.
F. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result:
A 5324-7, 5325-7, 5326-7, or 5327-7 diagnostic code is
active or recently logged.
Proceed to Test Step 3.
Result:
A 676-XX diagnostic code is active or recently logged
Proceed to Test Step 6.
Result:
An active diagnostic code or a recently logged diagnos-
tic code was not displayed.
In order to identify intermittent faults, refer to Troubleshooting,
“Electrical Connector - Inspect”.
(continued)
UENR0612
133
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