Table 35
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool
and the Electronic Control Module (ECM) . Refer to Troubleshoot-
ing, “Electronic Service Tools”, if necessary.
B. Use the electronic service tool to check for active diagnostic
Diagnostic codes Result: There are active diagnostic codes.
Troubleshoot any active codes before continuing with
this procedure. Refer to Troubleshooting, “Diagnostic
Trouble Codes”.
Result: There are no active diagnostic codes.
Proceed to Test Step 2.
2. ECM Flash File
A. Verify that the latest flash file is installed in the ECM.
Flash file Result: The latest flash file is not installed.
Install the latest flash file. Refer to Troubleshooting,
“ECM Software - Install” for the correct procedure. Verify
that the repair eliminates the fault.
Result: The latest flash file is installed.
Proceed to Test Step 3.
3. Glow Plugs
A. Check the operation of the glow plug circuit. Refer to Trouble-
shooting, “Glow Plug Starting Aid - Test”.
Glow plugs Result: The glow plugs are not operating correctly.
Make the necessary repairs. Verify that the repair cor-
rected the fault.
Result: The glow plugs are operating correctly.
Proceed to Test Step 4.
4. Coolant Temperature
A. Check that the water temperature regulator is operating cor-
rectly. Refer to Systems Operation, Testing, and Adjusting, “Water
Temperature Regulator - Test”.
Coolant
temperature
Result: The water temperature regulator is not operat-
ing correctly.
Replace the water temperature regulator. Verify that the
repair corrected the fault.
Result: The water temperature regulator is operating
correctly.
Proceed to Test Step 5.
5. Cooling System
A. Check for an internal coolant leak into the cylinder and/or the ex-
haust. Refer to Systems Operation/Testing and Adjusting, “Cooling
System”.
Internal coolant
leak
Result: There is an internal coolant leak.
Make the necessary repairs. Verify that the repair elimi-
nated the fault.
Result: There is not an internal coolant leak.
Proceed to Test Step 6.
(continued)
UENR0612 83
Symptom Troubleshooting
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