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Fault mode 21˖Fuel consumption too much
Possible cause Correction
Something related to driving technique
Check driver’s operation for gear shift, deceleration
and idle speed
Display error of the odometer Adjust or replace the odometer
The drive system cannot match the engine
Check the transmission gears and make sure that
the components of the engine and drive system are
correct
Leakage of fuel
Check the fuel system pipeline for leakage and
tighten connectors if loosened
The resistance of intake or exhaust is too great
Check the intake and exhaust systems, especially
the air filter and exhaust muffler
Oil level is too high Check and adjust the oil level
Injection pump timing is not correct
Check and adjust injection timing. Refer to 5.2 for
the procedure
Poor seal of intake valve or exhaust valve Check and adjust valve clearance
Fuel is not correct 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
Fault mode 22˖Coolant temperature above normal -- gradual overheat
Possible cause Correction
Overload operation Reduce the load
Coolant level is too low
Check the coolant level and engine external for
leakage, eliminating the leakage and adding the
coolant to be within the specified range
Oil level is too high or too low
Check oil level and adjust it to be within the
specified range
The radiator core is broken or blocked
Check the radiator core and repair or replace it if
necessary
The coolant pipe is collapsed and there is
leakage
Check the pipe and replace it if necessary
The drive belt is loose Check the drive belt and replace it if necessary
Fault of the pressure cap of radiator and pressure
calibration is too low
Check the function of the pressure cap
Fault of the thermometer or temperature sensor
Check the thermometer and sensor, and make
replacement when necessary
Air in the cooling system
Check the connector at water pump inlet for
leakage
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