CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
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2. The engine can draw rotating but can not start successfully when it is started.
General failure component: 1) no fuel in fuel tank; 2) fuel pump; 3) speed sensor; 4)
ignition coil; 5) engine mechanical part.
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); starting the engine by starter and check
fuel pressure 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
Connect EFI diagnostic meter; observe “engine speed”
data item and start the engine and check if there is
rotation speed signal is output.
No
Repair the
sensor cable
Yes Next step
3
Pull off one of the cylinder separating line and take off
this cylinder injector joint and connect spark plug to it;
keep the spark electrode around 5mm away from
engine body; start the engine by starter and check if
there is blue and white high pressure fire.
No
Repair the
ignition system
Yes
Eliminate
engine
mechanical
failure
4 Check the pressure of each engine cylinder; check if
there is engine cylinder insufficient pressure.
No Next step
Yes Diagnosis help
5
Check if the power supply to ECU pin No.12, 13, 44,
45, 63 is correct; check if the pin armature of No. 3,
51, 53, 61, 80 are working correctly.
No
Check the
corresponding
line
