Table 76
Troubleshooting Test Steps
Values Results
1. Proceeding Down Steep Grades (If Applicable)
Engaging the engine brakes on a steep grade may be neces-
sary. Not all applications have engine brakes.
A. Make sure that the operator understands the correct oper-
ation of the machine while using the engine brakes.
Steep grades Result: Steep grades are the cause of the overspeed.
Repair: Control the engine speed during steep grades.
Result: Steep grades are not the cause of the overspeed.
Proceed to Test Step 2.
2. Diagnostic Codes
A. Download the Warranty Report and the Product Status Re-
port with Histograms before performing any troubleshooting
or clearing any diagnostic codes.
Note: The downloaded information will be required by the
Dealer Solutions Network (DSN) if troubleshooting assis-
tance is needed.
B. Use the electronic service tool to check for active or
logged codes.
Diagnostic codes Result: A diagnostic code is not active or logged.
Return the unit to service.
Result: At least one of the diagnostic codes listed in Table
75 is active or recently logged.
Proceed to Test Step 3.
3. Turbocharger or Turbochargers
Note: The turbocharger or turbochargers that are installed on
the engine are nonserviceable items. If any mechanical fault
exists, then the faulty turbocharger must be replaced.
A. Check for any oil that may be leaking into the intake air.
Turbocharger Result: A turbocharger is leaking oil into the intake air.
Repair: Replace the faulty turbocharger.
Proceed to Test Step 5.
Result: A turbocharger is not leaking oil into the intake air.
Proceed to Test Step 4.
4. Combustible Gases or Liquid in the Intake Air
A. Check for combustible gases in the surrounding
atmosphere.
B. Check for combustible liquid in the air intake.
Air quality Result: The atmosphere has combustible gases.
Repair: Do not operate the engine in an environment with
combustible gases.
Result: There is combustible liquid in the air intake.
Repair: Remove the liquid. Investigate and rectify the cause
of liquid ingestion
Result: The intake air does not contains combustible gases.
Contact the Dealer Solutions Network (DSN).
(continued)
UENR4469-36 155
Symptom Troubleshooting
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