Maintenance Manual for Chery·Windcloud Marelli EFI System
8). Idle speed is instable after the completion of warming-up
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 Set ignition switch in “ON”. Connect
commutator between ECU and wire harness,
and then check to see if the voltages of ECU’s
intake manifold absolute pressure sensor output,
intake air temperature sensor output, coolant
temperature sensor output, oxygen sensor output
pins and ECU output to idle speed actuator pins
are in good order.
No Repair or replace
wire harness and
relevant parts
Yes Go to next step 3 Shut down the engine and check if air filter is
smooth.
No Replace
Yes Go to next step 4 Check if intake manifold pressure is between
35-55kPa when idling (when idling, the intake
pressure of old and new camshafts of A11
series varies from each other).
No Eliminate intake
system air leakage
failure
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 Replace 7 Recheck injector to see if it is working in good
order after cleaning.
No Replace injector
Yes Replace fuel 8 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
13 Check if fuel return pipe is blocked up or bent. Yes Repair or replace fuel
return pipe
47
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