Chery automobile Service Manual page 180

(the connecting point will depend on
the types of car models). Ground the
86# pin of the fuel pump relay
directly. Connect the ignition switch
to operate the fuel pump relay and the
fuel pump in order to verify that the
fuel pressure is maintained at about
350kPa.
Provide a voltage supply of 12V with
special connector between the battery
9
and the fuel injector, and verify that
the fuel injector functions normally.
After washing and cleaning the fuel
10 injector, verify again that it can
function normally.
Verify that the fuel is deteriorated or
11
contaminated with water.
Verify that the fuel pressure is lower
12
than 350kPa.
Close the fuel manometer valve.
Connect the ignition switch again to
13 re-operate the fuel pump in order to
verify that the fuel pressure can be
established.
Open the fuel manometer valve and
clamp the fuel return pipe with the
14
fuel tube clamp to stop the fuel return
in order to verify that the fuel
pressure can be established quickly.
Verify that the fuel inlet pipe has any
15
leakage or blockage.
Verify that the fuel return pipe has
16
any leakage or bending.
Verify that the pressure of engine
17
cylinder is normal.
Verify that the engine air intake
18
system has any leakage.
Verify that the absolute pressure and
19 temperature sensor of air intake
manifold have any blockages.
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Replace the fuel pressure
Yes
No
Repair or replace the fuel
Yes
No
Repair or replace the fuel
Yes
Replace the fuel pressure
No
Yes
No
Yes
No
Yes
No
G-71
Proceed to Step 12
Proceed to Step 11
Proceed to next step.
Proceed to next step.
Replace the fuel injector
Replace the fuel
Proceed to Step 17.
Proceed to next step.
Proceed to Step 16.
Proceed to next step.
Proceed to Step 15
regulator.
Repair or replace fuel
injector or fuel pipe
air inlet pipe
Replace the fuel pump
return pipe
regulator
Proceed to next step.
Fix the malfunction
Repair
Proceed to next step.
Repair or replace
Replace the ECU.