CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
60
4. It’s hard to start the cold car.
General failure component: 1), water in the fuel; 2), fuel pump; 3), coolant temperature
sensor; 4), injector; 5), ignition coil; 6), throttle valve and idle speed by pass port; 7),
engine mechanical part.
General diagnosis 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); start 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
Check and repair
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 2500Ωresistance at the joint of
coolant temperature sensor; observe if we can start the
engine)
No Next step
Yes
Clean throttle
valve and idle
speed air port
4
Step on the accelerator slightly and observe if it is easy to
be started
No Next step
Yes Replace the part
5
Disassemble the injector, check the injector using the
injector special cleaning analysis meter and observe if it
is leaking or jammed.
No Next step
Yes Change fuel
6
Check fuel conditions and check if the failure is appeared
after the fuel refilling
No Next step
Yes Trouble shoot
7
Check pressure conditions of every cylinder and observe
if there is insufficient pressure
No Next step
Yes Diagnosis help
8
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.
No
Check correspond
circuit
