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Chery A11. Manual - part 184

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

if ignition advance angle is normal after coolant
temperature reaches normal value.

No Adjust

ignition

advance angle

Yes

Go to next step

Check if cylinder compression pressure of
engine is normal.

No Troubleshooting

Yes

Repair or replace

Check if intake manifold absolute pressure and
intake air temperature sensor is blocked up.

Go to next step

Yes Replace

ECU

Check if coolant temperature sensor is in good
order.

Repair or replace

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

5). Vehicle cold starting is difficult

Step Operation

Result

Solution

Yes Eliminate

failure

displayed

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

Go to next step

Yes

Go to next step

Check with multimeter to see if coolant
temperature sensor is in good order. (Or connect
in series a 1.5K ohmic resistance between pins of
39# and 35# of ECU to replace coolant
temperature sensor and then start engine.) If
starting is OK, it shows coolant temperature
sensor is out of order.

No Replace

sensor

Yes

Go to next step

Switch on the ignition switch and connect
commutator between ECU and wire harness.
Check if the voltages of the following pins of
ECU are in good order: if the accumulator voltage
is about 12V on 13#, while 0 on 80# and 61#.

Check wire harness
and socket
connector

Yes

Go to next step

Check if air filter is smooth.

No Replace
Yes

Go to next step

After successful starting, check to see if intake
manifold pressure is between 35-65kPa during
idling.

No Eliminate

intake

system air leakage
failure

Yes

Check throttle and
idle speed passage

Slightly step down on throttle to see if the starting
is easy.

Go to next step

Yes

Go to next step

Pull out the idle speed actuator connector on wire
harness before engine coolant temperature reaches
35℃ to see if engine speed declines.

No Repair

replace

idle speed actuator

Yes

Go to next step

Connect fuel pressure gauge valve (connecting
point may differ among models). Ground directly
the 86# pin of fuel pump relay. Switch on the
ignition switch to make fuel pump relay and fuel
pump work, and then check if fuel pressure is at
about 350kPa.

Go to step 12

Yes

Go to step 11

Provide 12V voltage directly from accumulator to
injector with special connector, and check if
injector is working in good order.

Go to next step

Yes

Go to next step

Recheck injector to see if it is working in good
order after cleaning.

No Replace

injector

Yes Replace

fuel

Check if fuel is deteriorated or contains water.

Go to step 17

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

Yes

Go to next step

Check if fuel pressure is lower than 350kPa

Go to step 16

Yes

Go to next step

Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once more,
and check if fuel pressure is established.

Go to step 15

Yes Replace fuel

pressure regulator

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

replace

fuel inlet pipe

Check if leakage or clogging occurs in fuel inlet
pipe.

Replace fuel pump

Yes Repair

replace

fuel return pipe

Check if fuel return pipe is blocked up or bent.

No Replace

fuel

pressure regulator

Yes

Go to next step

Check if cylinder pressure of engine is normal.

No Troubleshooting

Yes Repair

Check if leakage occurs in engine intake system.

Go to next step

Yes

Repair or replace

Check if intake manifold absolute pressure and
intake air temperature sensor is blocked up.

No Replace

ECU

Maintenance Manual for Chery · Windcloud

M7.9.7 EFI System

6). Instable idle speed occurs anytime

Yes Eliminate

failure

displayed

Set ignition switch in “ON”. Check with scanner
to see if there is failure information record.

Go to next step

Yes Repair

replace

idle speed actuator

Check if EWD3 idle speed actuator or idle speed
actuator of idle speed stepper motor is stuck.

Go to next step

Yes

Check wire harness
and socket
connector

Switch on the ignition switch, and check if the
connections between water temperature sensor,
idle speed stepper motor and ECU are in good
condition.

Go to next step

Yes

Go to step 8

Make engine run at idle speed, and stall cylinders
one by one to see if engine speed declines or
fluctuates.

Go to next step

Yes

Go to next step

Check the injector working condition of each
cylinder to see if it is in good order.

Check injector and
wire harness

Yes

Go to next step

Check to see if the high voltage line resistance of
each cylinder is in good order.

No Replace
Yes Replace

Check if ignition coil is damaged.

Go to next step

Yes

Go to next step

Check if spark plug is in good order.

Replace spark plug

Yes

Go to next step

Connect fuel pressure gauge valve. Strap the 30#
and 87# pins of pump relay to make fuel pump
work, and then check if fuel pressure is at about

350kPa.

Go to step 13

Yes

Go to step 12

Provide 12V voltage directly from accumulator to
injector with special connector, and check if
injector is working in good order.

Go to next step

Yes

Go to next step

Recheck injector to see if it is working in good
order after cleaning.

No Replace

injector

Yes Replace

fuel

Check if fuel is deteriorated or conatians water.

Go to step 18

Yes

Go to next step

Check if fuel pressure is lower than 350kPa.

Go to step 17

Yes

Go to next step

Shut down fuel gauge valve. Switch on ignition
switch again to make fuel pump work once more,
and check if fuel pressure is established.

Go to step 16

Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel

Yes Replace fuel

pressure regulator

Content .. 182 183 184 185 ..