Chevrolet Low Cab Forward 2023 Manual page 149

148 Driving and Operating
Although the DPF filter automatically
undergoes regeneration (burning of the
accumulated PM) when a certain amount of
PM has accumulated, driving conditions can
prevent completion of regeneration.
The DPF warning light will come on when
regeneration cannot be completed
automatically. Perform Running or Switch
regeneration in accordance with the proper
procedure. This is to restore DPF function
and is normal.
The exhaust pipe mixes air with the exhaust
gas to lower its temperature before it leaves
the exhaust pipe.
The frequency of regeneration increases
especially under the following environments:
Midwinter.
Continuous low-speed driving for long
hours (The frequency of regeneration
increases particularly with special
equipment vehicles such as sweeper
vehicles which mainly travel at low speed.
The frequency of regeneration is higher
as compared to delivery vehicles which
mainly travel at standard high speed).
Under normal driving conditions DPF
regeneration is automatic. However, you
should perform the Switch regeneration
procedure when the DPF warning light
comes on. The DPF warning light may be
displayed under the following driving
conditions
During continuous driving at or under
15 km/h (9 MPH).
When frequent engine start and stop are
performed.
When the engine stops every time before
the engine is warmed up.
When continuous idling (over 1 hour) is
frequently performed.
If the vehicle is stationary with the engine
idling during DPF regeneration, the exhaust
brake or exhaust throttle operates.
Operating sounds will be heard when the
exhaust brake or exhaust throttle is
activated or deactivated. The sounds do not
indicate a fault.
White smoke could be emitted briefly from
the exhaust pipe in the following situations,
but it is not indicating a fault.
Combustion of PM during DPF
regeneration.
During DPF regeneration of a new vehicle
which has been driven a certain distance.
The vehicle may not emit white smoke
during its initial operation when new.
Long continuous idling.
The exhaust brake may automatically be
activated in order to prevent emission of
white smoke if the engine idles continuously
over an extended period of time.
White smoke may be produced during
switch regeneration; do not perform switch
regeneration in any poorly ventilated indoor
place.
White smoke may be produced during DPF
regeneration when a new vehicle has been
driven a certain distance, but this is not a
malfunction. The vehicle may not emit white
smoke immediately after purchase.