CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
59
3. It is hard to start the heating car.
General failure component: 1) water inside of fuel; 2) fuel pump; 3) coolant
temperature sensor; 4) fuel pressure regulator vacuum pipe; 5) ignition coil.
General diagnostic flow
No. Operating steps Result
Follow up
steps
Yes Next step
1
Connect the fuel pressure meter ( connecting point is the
front end of fuel distributing pipe assembly fuel intake
pipe); starting the engine and check fuel pressure at idle
speed if it is around 260kpa; take off the vacuum pipe
from fuel pressure regulator check the fuel pressure if it
is around 300kpa.
No
Repair the
fuel supplying
system
Yes Next step
2
Pull off one of the cylinder separating line and connect
spark plug to it; keep the spark electrode around 5mm
away from engine body; start the engine and check if
there is blue and white high pressure fire.
No
Repair the
ignition
system
Yes
Repair circuit
or replace
sensor
3
Take off the coolant temperature sensor joint and start
the engine; observe if the engine can be started
successfully. (or serial connecting a 300Ωresistance at
the joint of coolant temperature sensor; observe if we
can start the engine)
No Next step
Yes
Repair or
replace
4
Check if there if loosen or leaking of the fuel pressure
regulator vacuum pipe..
No Next step
Yes Change fuel
5
Check fuel conditions and check if the failure is
appeared after the fuel refilling
No
Diagnosis
help
Yes
Diagnosis
help
6
Connect EFI system adaptor, turn on the ignition switch;
check the power supply of pin No.12, 13, 44, 45 and
No.63 if it is in right conditions; check pin armature of
No.3, 51, 53, 61 and No.80 if it is in right conditions.
Check
correspond
circuit
