Chery A11. Manual — part 37
CAC Gasoline Engine Maintenance And Servicing Manual
103
——engine idling speed actuator doesn’t work
——shorted fuel injector +12V circuit
——opened or shorted ignition coil circuit
also, monitor the following failure：
——with engine cycling start or engine working,
signal wheel is not synchronous.
——opened or shorted λsensor circuit
——opened fuel pump circuit
If a sensor failure(except the speed sensor/ TDC sensor) is
indicated, ECU will substitute the preset value for the input data
from the faulted sensor to keep engine operating. Also ECU
will store the failure in the memory permanently. At the same
time, the sensor will be kept out of the system until the sensor
signal matches the signal from ECU again.
If the actuator or the corresponding signal channel fails,
the above program is also applied.
When a failure is detected and the corresponding substitute
value is applied, the warning light on the instrument panel will
turn on.
Warning light will go out only when the component was
replaced by the dealer or the failure is non long-term .
No matter whether the failure is long-term, the failure data
will be stored permanently in the memory.
communicate with CHECK—UP1 actively
Connecting CHECK—UP1 diagnosis tool to the system
may fulfill the following operations:
——display the short-term or long-term malfunctions or
parameters
—— active diagnosis：
—— fuel injector
—— fuel pump
——
ignition module
—— idling
speed actuator
I.A.W
system warning light
—— fuel
vapor recirculation solenoid
Fig. 162
Fig. 163
CAC Gasoline Engine Maintenance And Servicing Manual
104
Removal and reinstallation for fuel pump：
Fuel pump is installed inside the fuel tank.
Removal procedure is as following:
—— switch off the power supply
—— remove quick release fuel
Outlet pipe and fuel return pipe
Remove and reinstall filter
—— loosen and remove the filter mounting bolt from the
bracket
—— remove the sealing clip of fuel pipe from the filter
—— during operating, use an appropriate container to
collect the fuel drained
The fuel filter must be replaced every 30,000km.
Note: The filter must not be installed reversely , it must
be replaced even for the reverse installation of short time. The
arrow on the case indicates the direction of fuel flow .
replace oxygen sensor orλsensor:
—— remove the electric connections (1) and (2) from theλ
sensor
—— removeλsensor from the case
——during reassembling, grease should be applied on
threads. antiseize boron nitrogen grease is recommended.
Fig.164
Fig. 165
CAC Gasoline Engine Maintenance And Servicing Manual
105
tightening torque 0.5—0.6Nm
at ambient temperature, The resistance indicated by
digital multimeter should be 2.5—4.5Ω.
Note: Even though little lead exists in the fuel, the
sensor may fail soon. the function inspection is specified
every 45,000km and 90,000km.
The throttle valve cable adjustment
Adjust the throttle cable according to the following:
—— Loosen two lock nuts(2)，hexagonal lever(3) is retained in the protective sleeve
—— tighten or loosen hexagonal lever (3) to adjust the end position of protective boot (4) insuring the cable
(1) is not too loose or too tight when pedal is released.
—— tighten the two lock nuts (2) in the hexagonal lever (3)
—— depress accelerator pedal fully. Check for throttle valve operation while it is fully open.
sensor
Fig. 166
CAC Gasoline Engine Maintenance And Servicing Manual
106
5.malfaction, cause and correction
Malfuction
cause
Correction
Fuel pump. fuel
injector IVM523
check for operation by CHECK—UP1
Tachometer
senser.
Check wring, sensor resistance and installation of the sensor.
Dual relays
Check for function, connector connection and blown fuse.
Vehicle cannot start
35——pin
connection
Check for the wiring connection to ECU.
Difficult to start;
idling speed too
high or too low
Engine
idling
speed
control
solenoid.
check for solenoid operation and 4—pin connection by
CHECK—UP1.
warning light on
During idling,
λsensor
Check for the wiring, proper sensor tightening torque and the
sensor heater’s operation
warning light on for
a long time
Diagnosis
warning light
Check for the signal wiring grounding.
warning light
doesn’t turn on
Diagnosis
warning light
The bulb is broken or circuit is open
Rough idling at high
temperature.
Throttle
valve
sensor or water
temperature
sensor
the throttle valve opening angle and water temperature signal
displayed by CHECK—UP1 should match the engine operation.
Rough idling at low
temperature.
coolant
temperature
sensor or intake
air temperature
sensor
The temperature indicated should be in the vicinity of the
ambient temperature.
Idle intermittent
wave
1—throttle
valve body
30MM4
1.check the throttle valve cable for proper adjustment, smooth
movement.
2.if the throttle valve cable is correctly adjusted and may move
smoothly, remove it. Check the throttle valve for resistance by
turning it with a hand (for friction)；
3.display the throttle valve position by CHECK—UP1. If both 1
and 2 are correct and engine speed is still high , while
CHECK—UP1 displays “angle is greater than the allowable
angle”, then the malfunction is positively determined. It is
necessary to replace the throttle valve potentiometer. If the angle
is within the specified range, sensor wiring and connector should
be checked.
Idling speed
fluctuates
continuously at high
temperature.
1.throttle valve
body
1.2 seal
1.3
vacuum
connection
1. check the above item 1,2,3 for intermittent idling speed
functions;
1.2 check the seal between cylinder head and throttle valve body;
1.3check the vacuum lines to the two vacuum passages,
which are of absolute pressure. check the fuel vapor
recirculation
passages, which are connected to the throttle
valve body and intake manifold.
Check the vacuum tube sealing in intake manifold for brake
servo .
Vehicle performance
deteriorates
1—fuel supply
system
1. Check for fuel supply. If fuel pressure is 1±0.1bar, it is ok;
2. If malfunction still remains after upper throttle body
(30mm12) is replaced, with a pressure regulator in the upper
throttle body, check fuel filter and fuel pipes.
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