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Fault mode 8˖Engine power output low
Possible cause Correction
Inquire the driver or operator Obtain all the information related to the problem
Overloaded operation Reduce the load to allowed range
The engine runs on the plateau beyond the
specification
Run the engine on the specified plateau. Engine
power decreases with increase of altitude
The drive system has been changed and cannot
match the engine
Check the transmission gears for mismatch of the
engine
Oil level is too high Check and lower oil level to the specified range
The accelerator pedal doesn’t arrive at the
bottom
Check accelerator pedal for restriction
Accessories load is too big
Check the cooling fan for abnormal operation and
vehicle braking for friction
Air in the fuel system
Check for air in the system. Tighten or replace the
fuel joints, fuel pipes if necessary and then prime
the system
Fuel inlet temperature is high Add fuel into the fuel tank
The fuel supply is blocked
Check the fuel inlet resistance and replace the fuel
filter (first stage) and fuel filter (second state) if
necessary
Leakage of the exhaust manifold or turbocharger
Check the exhaust manifold and boost pressure to
find and eliminate the source of leakage
The resistance of exhaust system fails to meet
the requirements
Check the exhaust system resistance
The resistance of intake system exceeds the
specified value
Check the intake system resistance and replace the
air filter element if necessary
Leakage in the intake system
Check the connection of intake manifold, intake
pipe, intercooler, its pipeline for looseness or
leakage
Fault of the turbocharger Check the boost pressure
Fuel is not proper or its quality is poor
Use the fuel specified in this manual and fill a
temporary tank with right high-quality one, with
which to run the engine and verify the fuel issue
Incorrect injection pump timing
Check and adjust injection timing. Refer to 5.2 for
the procedure
Intake/exhaust valve clearance error (s) Check and adjust valve clearance
Fault mode 9˖Rough running and misfiring
Possible cause Correction
Only happens at idle speed
Refer to the fault mode “Rough running at idle” for
correction
Low running temperature
Refer to the fault mode “Coolant temperature below
normal”
Intake/exhaust valve clearance error (s) Check and adjust valve clearance
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