Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 81
1A-271 Engine General Information and Diagnosis: For Diesel Engine Model
Diesel Particulate Filter Regeneration
Description
S6JB0A1121006
As Diesel Particulate Filter is a device to trap the diesel
particulate (PM), it is necessary that the accumulated
PM is burned and diesel particulate filter regenerated.
There are three ways to regenerate diesel particulate
filter.
• “Natural regeneration” by catalysis and exhaust gas
temperature
• “Forced regeneration” by post-injection
• “After-sales regeneration” by using SUZUKI scan tool
And, here is the mechanism to regenerate diesel
particulate filter.
1. Diesel particulate filter, trapping PM, carries out
“Natural regeneration” according to the driving
condition. The driver will not find it.
2. ECM consistently monitors the exhaust gas
temperature, injection quantity, driving time, vehicle
speed, PM mass etc. In case of the long-time idling
and traffic jam at low speed that cause lowering the
exhaust gas temperature, PM is accumulated
gradually.
When “Natural regeneration” becomes insufficient
(PM mass exceeds 25 g), ECM will perform “Forced
regeneration” by the post-injection at the point of
appropriate driving condition. The post-injection will
heat the exhaust gas temperature to enable “Forced
regeneration”. In this situation, any warning indicator
will not come on. Therefore, the driver will not
recognize that “Forced regeneration” is performed.
3. If “Forced regeneration” is interrupted by the engine
stop, long-time idling and traffic jam at low speed
that do not keep the specified exhaust gas
temperature, ECM will memorize it as “Regeneration
failure”. When the “regeneration failure” number (5
times) or PM mass reach at the specified conditions
(PM mass exceeds 42 g), ECM will find it as
“impossible to regenerate by diesel particulate filter
itself and incapable of continuing the driving” and
ask the driver for a help. This is “Speed request”
announced to the driver by diesel particulate filter
warning light (1) in combination meter. Then, the
driver will be asked to increase the vehicle speed
more than 75 km/h (47 MPH) on the average for
heating the exhaust gas temperature. If the
regeneration is completed by “natural regeneration”
or “Forced regeneration” when accumulating
“regeneration failure”, the accumulation of
“regeneration failure” will be reset.
4. After the driver fulfills “speed request” for the
regeneration and PM mass falls to the specified
amount (5 ~ 8 g), the regeneration will complete and
diesel particulate filter warning light be turned OFF. It
will take about 20 minutes to complete the
regeneration if the regeneration driving is performed
properly. During the regeneration driving, “Forced
regeneration” will go simultaneously to hasten the
increase of exhaust gas temperature and shorten
the time of regeneration. When the engine stops
before diesel particulate filter warning light is turned
OFF, PM mass that should be decreased will be
calculated at starting the engine next time. At that
time, if PM mass does not fall to the specified
amount, diesel particulate filter warning light will
come on again and the vehicle continue to ask the
driver for regeneration driving.
5. If the regeneration driving is not achieved and diesel
particulate filter becomes almost clogged while
“Speed request” is on, injection warning light (Gravity
1 Fault) (2) in combination meter will come on. Also,
to prevent diesel particulate filter from melting and
cracking, ECM will take following actions;
1) EGR (Exhaust Gas Recirculation) will be cut off to
avoid generating the extra PM.
2) “Forced regeneration” function will stop.
3) Driving performance will be limited by lowering the
engine torque to avoid “Natural regeneration”.
Therefore, the driver will recognize the malfunction of
diesel particulate filter.
In this situation, “After-sales regeneration” using
SUZUKI scan tool will be necessary or diesel particulate
filter has to be replaced in the worst case.
Schematic and Routing Diagram
Electronic Control System Diagram
S6JB0A1122001
NOTE
For vehicle without diesel particulate filter, numbers / parts with asterisk (*) below are not equipped.
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I5JB0B110016-01