Troubleshooting

Activate this override using the electronic service
tool. This override is used to check that the glow
plugs are functioning correctly. The override will
remain active until switched off using the electronic
service tool.
Navigate to the following menu options in the
electronic service tool 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: 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 Diag-
nostic 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 diagnostic code is active or recently logged
Proceed to Test Step 6.
Result: An active diagnostic code or a recently logged diag-
nostic code was not displayed.
Repair: To identify intermittent faults, refer to Troubleshooting,
“Electrical Connector - Inspect”.
(continued)
136 UENR0612-07
Circuit Tests
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