Chery A21 2005, Service Manual, Page: 269 / 475

The fuel pressure is too low or too high, and start difficultly.
Because lacking of maintenance for a long time, it results in that: 1 The filter screen
jammed ; 2 Grain impurity result in the serious leakage; 3 Manmade mechanical
damage and so on.
（ 1 ） It is forbidden to impact the diaphragm with high
pressure gas; （ 2 ） It is forbidden to clean it with causticity fluid; （ 3 ） It is forbidden to force
on it and result in distortion.
Connect the fuel pressure gauge at the oil intake pipe and start the engine to let it work on
idle speed, check whether the fuel pressure is about 350kPa; step the accelerate pedal until
the engine reaches the speed of 2500rpm, check whether the fuel pressure is about 350kPa
then.
（ ）
（ ） （ ）
In the maintain procedure:
Fault description
Troubleshoot
：
Fault analysis ：
Notice for maintenance ：
：
The carbon canister only has two pins,
with one connecting to the 87th p in of main
electric equipment output port , and the othe r
connecting to the 5th pin of ECU.
Canister purge valve controls the volume of cleaning air flow from charcoal
canister to air int ake main pipe. Th e adsorb ing capab ility of carbon canister is l imited,
if the oil steam ad sorbed in the carb on canister can't be consumpt, the oil will volatilize
to outside and pollute the air.
（ 5 ） Cooling fan control module
ECU Controls the running of fan according to the engin e coolan t temperature
and A/C requirement signal, it controls the relay of fan system if conditions are met.
Figure8-2 0 Cooling fan control module circ uit
1 ． High speed relay line is short circui t to power ；
2 ． High speed relay line is short circui t to groun d ；
3 ． High speed relay line is op en circuit ；
4 ． Low speed relay li ne is short circuit to power ；
5 ． Low speed relay li ne is short circuit to ground ；
6 ． Low speed relay li ne is open circuit ；
7 ． Engine coolant temperature sensor f ault ；
8 ． Engine air intake temperat ure sensor fault ；
Common troubles ：
（ 6 ） Canister purge valve
46
ECU
Figure8-2 1 Canister purge valveand its circuit
To main relay
M M
86 30
85 87
A6 A5
86 30
85 87
B/O W
68 50
High electrical
fan relay
FrontGround/
DC/2
ECU
Fan control
m odule
To Ground
To Main Re lay To Main Power
21
Low electrical
fan relay
Canister pu ge valve
r
Canister purge valve