Maintenance Manual for Chery·Windcloud Marelli EFI System
6). Instable idle speed occurs anytime
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 Repair or replace
idle speed actuator
2 Check if idle speed actuator of idle speed stepper
motor is stuck (in case binding occurs in idle
speed stepper motor, this failure can not be read
from scanner, neither does it have failure code).
No Go to next step
Yes Check wire harness
and socket
connector
3 Switch on the ignition switch, and check if the
connections between water temperature sensor,
idle speed stepper motor and ECU are in good
condition.
No Go to next step
Yes Go to step 8 4 Make engine run at idle speed, and stall cylinders
one by one to see if engine speed declines or
fluctuates.
No Go to next step
Yes Go to next step 5 Check the injector working condition of each
cylinder to see if it is in good order.
No Check injector and
wire harness
Yes Go to next step 6 Check to see if the high voltage line resistance of
each cylinder is in good order.
No Replace
Yes Replace 7 Check if ignition coil is damaged.
No Go to next step
Yes Go to next step 8 Check if spark plug is in good order.
No Replace spark plug
Yes Go to next step 9 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.
No Go to step 13
Yes Go to step 12 10 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 11 Recheck injector to see if it is working in good
order after cleaning.
No Replace injector
Yes Replace fuel 12 Check if fuel is deteriorated or conatians water.
No Go to step 18
Yes Go to next step 13
Check if fuel pressure is lower than 350kPa.
No Go to step 17
Yes Go to next step 14 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 16
15 Turn on fuel guage valve, clamp fuel return pipe
with fuel return interceptor to ensure no fuel
Yes Replace fuel
pressure regulator
44
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