Maintenance Manual for Chery·Windcloud Marelli EFI System
4). Rotating speed is normal, but starting is difficult all along
Step Operation Result Solution
Yes Eliminate failure
displayed
1 Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.
No Go to next step
Yes Go to next step 2 Check if air filter is smooth.
No Replace
Yes Go to next step 3 After successful starting, check to see if intake
manifold pressure is between 35-55kPa when
idling.
No Eliminate intake
system air leakage
failure
4 Slightly step down on throttle to see if the
starting is easy.
Yes Replace/check
throttle and idle
speed passage
Yes Go to next step 5 Connect fuel pressure gauge valve. Strap the
30# and 87# pins of fuel pump relay to make
fuel pump work, and then check if fuel pressure
is at about 350kPa.
No Go to step 9
Yes Go to step 8 6 Provide 12V voltage directly from accumulator
to injector with special connector, and check if
injector is working in good order.
No Go to next step
Yes Go to next step 7 Recheck injector to see if it is working in good
order after cleaning.
No Replace injector
Yes Replace fuel 8 Replace fuel and check if fuel is deteriorated or
contains water.
No Go to step 14
Yes Go to next step 9 Check if fuel pressure is lower than 350kPa
No Go to step 13
Yes Go to next step 10 Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once
more, and check if fuel pressure is established.
No Go to step 12
Yes Replace fuel
pressure regulator
11 Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
return, and check if fuel pressure is formed
rapidly.
No Repair/ replace
injector or fuel pipe
Yes Repair or replace
fuel inlet pipe
12 Check if leakage or clogging occurs in fuel inlet
pipe.
No Replace fuel pump
Yes Repair or replace
fuel return pipe
13 Check if fuel return pipe is blocked up or bent.
No Replace fuel
pressure regulator
Yes Go to next step 14 Pull out the idle speed stepper motor connector
on wire harness before engine coolant
temperature reaches 35℃ to see if engine speed
declines.
No Repair or replace
idle speed stepper
motor
Yes Go to next step 15 Set ignition switch in “ON”. Check if the
voltages of the following pins of ECU are in
good order: if the accumulator voltage is about
12V on 15#, 29# and 47#, while 0 on 27# and
28#.
No Check wire harness
and socket
connector
40
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