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TM 9-2320-312-24-2
Troubleshooting Section
Air Inlet Leaks
Note: If the problem only occurs under certain
conditions, test the engine under those conditions.
Inspect the air filter for leaks. Inspect all gaskets
Examples of certain conditions are high rpm,
and connections. Make repairs if leaks are found.
full load and engine operating temperature.
Troubleshooting the symptoms under other
conditions can give misleading results.
Fuel Leakage into the Engine Oil
Individual Cylinder Malfunction
Fuel leakage into the engine oil will cause high
fuel consumption and low engine oil pressure. This
condition may also increase the oil level in the
1. Check for an individual cylinder malfunction.
crankcase. Make repairs if leaks are found. Install
new parts, as required.
2. Ensure that the hydraulic electronic unit injector
connector (J300/P300) is fully connected and
Incorrect Engine Oil
ensure that the hydraulic electronic unit injector
connector (J300/P300) is free of corrosion.
Check oil recommendations for the proper oil
3. Ensure that the ECM engine harness connector
specifications for the engine operating conditions.
(J2/P2) is fully connected and ensure that the
engine harness connector (J2/P2) is free of
Incorrect Maintenance Interval
corrosion.
Review the oil change intervals in relation to the
4. Connect Caterpillar Electronic Technician (ET) to
nature and severity of the engine application.
the cab data link connector. Use the Cylinder
Review the records for the engine in order to verify
Cutout Test. Access the Cylinder Cutout Test
that the recommended intervals are being followed.
by selecting the "Diagnostic Menu" and the
"Diagnostics Test Menu". Run the Cylinder Cutout
Test in order to disable each cylinder. Disabling
i01641917
each cylinder allows the technician to isolate the
Engine Misfires, Runs Rough
misfiring cylinders.
or Is Unstable
If the misfiring cylinder can be isolated to
a specific cylinder, refer to Troubleshooting,
SMCS Code: 1000; 7569
"Injector Solenoid Circuit - Test".
Probable Causes
Fuel Supply
The probable root causes are listed in order below:
1. Monitor the exhaust for smoke while the engine
is being cranked.
Note: If the problem is intermittent and the problem
can not be duplicated, refer to Troubleshooting,
If no smoke is present, there may be a problem
"Intermittent Low Power or Power Cutout".
with the fuel quality or there may be a problem
with the fuel supply.
Individual cylinder malfunction
2. Check the fuel quality. Refer to the Truck
Fuel supply
Performance and Driveability Diagnostic Guide,
LEBT3477.
Low injection actuation pressure
3. Check the fuel pressure. Refer to Testing and
Accelerator pedal position sensor
Adjusting, "Fuel System Pressure - Test".
Power train data link
4. Ensure that the fuel system has been primed.
Refer to Testing and Adjusting, "Fuel System -
Camshaft position sensor
Prime".
Valve lash
5. Check for fuel supply lines that are restricted.
Recommended Repairs
6. Check the fuel filters.
Perform the following diagnostic procedures in
7. If the temperature is below 0 C (32 F), check
order:
for solidified fuel (wax).

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