Chery A11 2003 Repair Manual page 774

Maintenance Manual for Chery · Windcloud
8). Idle speed is instable after the completion of warming-up
1 Set ignition switch in "ON". Check with scanner
to see if there is failure information record.
2 Set ignition
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.
3 Shut down the engine and check if air filter is
smooth.
4 Check if intake manifold pressure is between
35-65kPa when idling.
5 Connect fuel pressure gauge valve (connecting
point may differ among models). 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.
6 Provide 12V voltage directly from accumulator
to injector with special connector, and check if
injector is working in good order.
7 Recheck injector to see if it is working in good
order after cleaning.
8 Check if fuel is deteriorated or contains water.
9 Check if fuel pressure is lower than 350kPa.
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.
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.
12 Check if leakage or clogging occurs in fuel inlet
pipe.
switch in "ON".
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M7.9.7 EFI System
Eliminate failure
displayed
Go to next step
Go to next step
Repair or replace
wire harness and
relevant parts
Go to next step
Replace
Go to next step
Eliminate intake
system air leakage
failure
Go to next step
Go to step 9
Go to step 8
Go to next step
Replace
Replace injector
Replace fuel
Go to step 14
Go to next step
Go to step 13
Go to next step
Go to step 12
Replace fuel pressure
regulator
Repair/ replace
injector or fuel pipe
Repair or replace fuel
inlet pipe
Replace fuel pump
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