Engine Electrical System

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