Page 795 - Foton Workshop Manual - Auman EST-M

Engine section - Exhaust purification device EG - 279

Component description IN

1. Urea pump assembly
DI
a. Post-treatment AdBlue injection unit of urea pump
assembly. The post-treatment AdBlue injection unit pumps
the AdBlue through the suction port and pressurizes it. The EG
filtration of post-treatment AdBlue injection unit is achieved

through the AdBlue to be sprayed into the exhaust system
TR
via the pressure hole.

b. The main components of the post-treatment AdBlue
AX
injection unit:

① Coolant connector
FR
② Post-treatment nozzle AdBlue connector

③ Compressed air supply connector
ST
④ Electrical connector of air stop valve

⑤ Electrical connector of post-treatment AdBlue injection unit
BR
⑥ Urea tank level and temperature sensor.

2. Catalytic and muffler assembly (EGP)
BW
a. Nozzle

The post-treatment injection unit supplies the correct amount
EL
of urea to the post-treatment nozzle. The post-treatment

nozzle sprays the AdBlue into the exhaust system.

b. SCR catalyst

The SCR catalyst mixes and converts urea to eliminate

unwanted gases and avoid emissions to the atmosphere. In
the exhaust stream, the SCR catalyst will require
temperature in excess of 200 ° C to properly convert
nitrogen oxides (NO x).

c. SCR intake air temperature sensor

The temperature sensor is part of the post-treatment system

and is used to monitor the temperature of the catalyst.

d. Nitrogen oxide sensor

NO x sensor is used to measure the nitrogen oxide discharge

of engine control and post-process system. With this

technical support, the vehicle manufacturers can meet the

strict global emission standards. The nitrogen oxide sensor
is a unitary device which consists of two parts. It is a small
module which is connected to the metal body of exhaust
system sensor with a piece of wire. Parts shall not be

separated NO x sensor not possible to repair. If the failure is

confirmed, replace the part.

EG-279