GENERAL INFORMATION (DIESEL PARTICULATE FILTER SYSTEM)


The Diesel Particulate Filter (DPF) system is used to adsorb and remove the Particulate Matter (PM) contained in the exhaust gas. The engine-ECU anticipates the amount of PM accumulated in the DPF through the input signal from each sensor.
If the PM accumulates more than the standard, the engine-ECU carries out the control that automatically regenerates the DPF under certain conditions to remove the PM. At the DPF regeneration, the DPF temperature gets high and high temperature exhaust gases are given off.

SYSTEM DIAGRAM




DPF WARNING SIGNAL

When the anticipated PM accumulation becomes larger in amount and reaches the specified level, the engine-ECU encourages the driver to drive under the driving conditions required for the DPF regeneration by showing the DPF warning mark on the multi information display <High contrast meter> or illuminating the DPF warning indicator <Standard meter>. When the PM accumulated in the DPF reaches its clogged or damaged level, the engine-ECU warns the driver that the vehicle must be brought to the workshop by showing the DPF warning mark in the multi information display <High contrast meter> or illuminating the DPF warning indicator <Standard meter> and illuminating the engine warning lamp. When the vehicle is brought into the shop with the DPF warning mark shown, service the vehicle in accordance with the following procedures.
DPF warning mark or DPF indicator
Engine warning lamp
 State and service
Shown/Illuminate
 Being lit
 The engine-ECU estimates that the PM will excessively be accumulated in the DPF.
At that time, the engine-ECU should store the diagnosis codes (P1498 and P2463). Carry out the troubleshooting regarding the stored diagnosis codes (Refer to GROUP 13D Diesel Fuel <4N1> - Troubleshooting - Diagnosis Code Chart ).
note The diagnosis code P2463 should be stored if the engine-ECU estimates that the PM will more excessively be accumulated after the P1498 is stored and the PM will reach the level where the DPF cannot be regenerated.
Shown/Illuminate
 Not being lit
 The status is that the driver is advised to drive the vehicle under the driving conditions in which the DPF automatic regeneration can be carried out because it is assumed that the PM is accumulated more than the specified value in the DPF. In this case, the DPF regeneration must be carried out using one of the following two methods:

  • After the engine warm-up, the vehicle must be driven at more than 40 km/h until the DPF warning mark is extinguished. The driving time is approximately 20 minutes. It is all right that the vehicle or the engine stops during the driving.

  • Using the MUT-III, the forcible DPF regeneration must be carried out (Refer to ).