The PM reduction device collects the soot (particulate matter) that is part of exhaust gas through the aftertreatment diesel particulate fil-ter (DPF) located in the muffler, and then continuously regenerates (burns) the soot by oxidation catal-ysis.
When continuous DPF regenera-tion cannot be performed due to low speed driving, the automatic DPF regeneration starts to burn (regenerate) the soot to prevent excessive accumulation in the DPF that is located inside the muf-fler.
When automatic regeneration does not operate due to low speed driving or starting/stopping the engine many times while driving, manual regeneration must be per-formed after stopping the vehicle.
Based on the amount of soot accu-mulated in the DPF, perform DPF regeneration following the table below.
NOTE:
If a certain amount of soot from exhaust gas accumulates in the DPF, the PM reduction device automatically burns (regener-ates) the collected soot.
Depending on the driving condi-tion, soot may not be com-pletely burned (regenerated). In that case, the DPF clogging warning light and the indicator light that is built in the manual forced regeneration switch will flash to indicate that manual DPF regeneration is needed.
INSTRUMENTS AND CONTROLS
Device information
Manual forced regeneration switch
DPF clogging warning light
The DPF clogging warning light will blink if manual DPF regenara-tion should be performed due to soot accumulation in the DPF.
When the warning light blinks, per-form the following procedure.
Also, when the ignition key is turned to the ON position, it illumi-nates for 1 second for a bulb check.
Procedure
Stop the vehicle in a safe location, and then perform manual DPF Soot deposit
accumulation Status of the vehicle Cleaning method
Little
Large
Normal driving (Continuous regeneration is performed while driving at a high speed or with a high load, therefore, soot is burned and cleaned.)
Automatic DPF regeneration When a certain amount of soot is accumulated, the soot is automatically burned and cleaned.
Flashing of the DPF clogging warning light and the indicator light that is built in the manual forced regeneration switch
Stop the vehicle in a safe location, and then perform manual DPF regeneration.
DPF system warning (Amber) and warning
message are displayed Contact your nearest UD Trucks dealer for inspection.
INSTRUMENTS AND CONTROLS
regeneration by operating the man-ual forced regeneration switch.
Manual forced regeneration switch
By operating this switch, the soot collected in the DPF is manually burned (regenerated) to keep the function of the exhaust gas clean-ing device properly.
For details on how to use this switch, refer to the “Manual DPF regeneration operation” section.
The indicator light that is built in the switch will blink just as the DPF clogging warning light blinks if manual cleaning should be per-formed due to soot accumulation in the DPF.
DPF soot level gauge
The DPF soot level gauge indi-cates the accumulation level of the soot in the DPF. Check if neces-sary.
For details on how to display, refer to the “Multi-display monitor” sec-tion in “INSTRUMENT AND CON-TROLS”.
Automatic DPF regeneration
To prevent excessive accumula-tion of soot in the DPF, the soot is automatically burned and cleaned.
Though engine noise and engine speed at idle will vary, the vehicle can be driven as usual.
NOTE:
While performing automatic regeneration, engine noise will vary and engine speed at idle will increase. This does not indi-cate a malfunction.
WARNING
Immediately after the vehicle is stopped or while the system is in the cleaning mode, the area around the muffler and exhaust gas are extremely hot.
Do not stop the vehicle in a location where there are flam-mable materials such as dried grass or paper waste.
If there are flammable materi-als around the vehicle, a fire may occur. This could cause burns from the heated exhaust gas.
INSTRUMENTS AND CONTROLS
Manual regeneration (when the DPF clogging warning light blinks)
If the vehicle is driven at a low speed or the engine is started/
stopped many times while driving, the soot in the DPF may not be burned and cleaned automatically.
In this case, the DPF clogging warning light informs the driver that the soot in the DPF must be burned and cleaned manually.
NOTE:
If the vehicle is driven under any of the following conditions, the DPF clogging warning light may blink many times because the automatic regeneration may not operate.
・The vehicle is frequently driven at a low speed.
・The engine is started/stopped many times while driving.
・The vehicle is driven many times for only a short distance.
・The engine is always stopped before it warms up.
Manual DPF regeneration operation
When the DPF clogging warning light blinks, perform manual DPF regeneration according to the fol-lowing procedure, and then burn and clean the soot in the DPF.
Note that manual regeneration can be performed when the indicator light blinks or automatic DPF regeneration is started.
The approximate time required for manual DPF regeneration depends on the conditions the last time the vehicle was driven and the engine idling status, however normally it takes 25 minutes.
1.Stop the vehicle in a safe location, and then keep the engine idling.
2.Be sure to apply the parking brake.
Place the gearshift lever in the neutral position. Do not depress the accelerator pedal.
3.Press the ON side of the manual forced regeneration switch.
4.When the DPF regeneration starts, the warning of DPF regeneration appears on the multi-display moni-tor. The engine speed at idle will increase.
CAUTION
When the DPF clogging warn-ing light blinks, operate the manual forced DPF regenera-tion switch to perform the cleaning manually, and then burn and clean the soot in the DPF.
If driving is continued, clog-ging in the DPF or a system malfunction may occur.
INSTRUMENTS AND CONTROLS
5.When the warning of DPF regener-ation by the exhaust gas cleaning device is no longer displayed on the multi-display monitor, manual DPF regeneration is completed.
The engine speed at idle will return to normal.
6.After manual regeneration is com-pleted, the vehicle can be driven as usual.
7.To stop manual regeneration part-way, press the CANCEL side of the manual forced DPF regenera-tion switch. When manual DPF regeneration is stopped partway, the warning of regeneration restric-tion of the exhaust gas cleaning
device appears on the
multi-dis-play monitor. WARNING
Do not perform manual DPF regeneration in a location with poor ventilation. Exhaust gas may cause carbon monoxide poisoning especially in an enclosed location, such as in a garage, indoors, etc.
Do not perform manual DPF regeneration in a location where there are flammable materials such as dried grass or paper waste. The tempera-ture of the exhaust gas and the area around the exhaust pipe and muffler become high dur-ing the cleandur-ing mode. There-fore, if there are flammable materials nearby, a fire may occur.
In addition, never allow your body to contact the exhaust gas and the area around the exhaust pipe and muffler.
Doing so may cause burn inju-ries. If the vehicle is stopped over a road surface that is painted, the road surface may be discolored.
INSTRUMENTS AND CONTROLS
NOTE:
The engine speed at idle increases while manual DPF regeneration is being per-formed. This is due to a temper-ature increase of the exhaust gas to burn (regenerate) the col-lected soot. This does not indi-cate a malfunction.
While performing manual DPF regeneration, the aftertreatment hydrocarbon doser system sup-ports the manual DPF regenera-tion by automatically injecting fuel in the exhaust pipe.
If the temperature of the inside of the muffler is higher, the man-ual DPF regeneration is com-pleted in a shorter time.
Manual DPF regeneration is completed in a shorter time when the engine is hot immedi-ately after the vehicle is stopped than when the engine is cool.
When the engine is cool, the time required for DPF regenera-tion takes longer because the DPF regeneration is performed after the engine warms up.
the engine depends on the out-side temperature, but generally it takes about 5 to 10 minutes.
Therefore, manual DPF regener-ation should be performed immediately after the vehicle is stopped (while the engine is still warm).
Manual cleaning cannot be per-formed under the following con-ditions.
・The engine coolant temperature (ECT) is low.
(Perform after the engine warms up.)
・The accelerator pedal (AP) is depressed.
・The parking brake is released.
・The transmission gear is placed in any position other than the neutral position.
For the models equipped with the PTO switch, be sure to turn the PTO switch off when turning the manual forced aftertreat-ment DPF regeneration switch on. The regeneration process does not start.
When manual aftertreatment
partway, it is not completed.
Resume manual regeneration soon.
If the vehicle is driven before the regeneration is completed, the DPF clogging warning light will blink again.
Manual DPF regeneration can be performed as stated above even if automatic cleaning is being performed.
When the DPF system warning is displayed
If the soot accumulation level reaches a specified limit by driving the vehicle with the DPF clogging warning light blinking, the DPF system warning, warning message and comment are displayed on the multi-display monitor to alert the driver. The warning appears in two different steps, amber and red.
When it appears, clogging in the DPF or system malfunction may occur.
INSTRUMENTS AND CONTROLS
When the amber DPF system warning appears, contact your nearest UD Trucks dealer for inspection.
While the amber DPF system warning appears, engine torque is reduced to protect the DPF.
When the red DPF system warning appears, immediately stop the vehicle in a safe location and con-tact your nearest UD Trucks dealer.
NOTE:
If the DPF system warning appears, the exhaust gas clean-ing device may be damaged.
Manual DPF regeneration is not possible.
LEVERS AND CONTROL