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Fault phenomenon—Too high or too low idle
speed (idle speed is obviously inconsistent
with target idle speed)
Too high
idle speed:
When the water temperature is
lower than 68 degrees, the system
will increase idle speed to
accelerate warming-up process,
which is normal phenomenon.
Check the items according to the
following items except that
Check whether it needs to adjust
the negative pressure equilibrium
of cylinder
Check whether valve clearance,
especially exhaust valve clearance
is too large
Too low
idle speed:
Check fuel quantity in fuel tank,
fuel filter, fuel line pressure and
nozzle
Checking Valve Clearance and
confirm whether it is too small
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