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Chery QQ Maintenance Manual 465 EFI System

Chapter 1 The principle for EFI and actuator

1. Intake air pressure and intake
temperature sensor

Usage: Measure baro pressure equal or
below 115kPa in manifold and intake air
temperature to supply load information for
engine.
Constitute and pricinple:The sensor consists
of two sensors, MAP and IAT, which
mounted on voltage stablizer box.
MAP: Map consists of one silicon chip that
etched a film on the chip. There are 4
piezoelectric resistances that consist of a
Wiston bridge. The information processing
circuit is also on the chip. The chip consists
of closed reference space with a metal shell.
The air absolute pressure in the space is
nearly to zero. In this way, a micro
electric-mechanic system is formed. The
active face of the chip is endured a pressure
nearly to zero, and MAP pressure applies on
the back of the chip through a connecting
pipe. The thickness of the chip is only
several microns（　um），so the change of
MAP pressure will result the mechanical
deform for the chip together with 4
resistances to change their resistance. The
voltage signal that is linearity with pressure
is formed after processing by information
processing circuit in the chip.
Intake air pressure: IAT is a resistor with
NTC. Like coolant temperature sensor, the
resistance decreased with the temperature
increasing. ECU in engine monitors the
change of intake air temperature
(corresponding in series circuit).
Diagnosis: The open, short or wear of sensor
could be detected by the rear electronic unit
of MAP.
ECU will judge the malfunction of sensor if

the out put signal exceeds the signal outside
the curve of output feature. For example, if
the intake air pressure is higher than the up
limit or lower than lower limit,ECU will
judge that sensor is malfunction ( The intake
air pressure is below lower limit in starting,
but ECU can judge starting condition),
“CHECK ENGINE”light will on at same
time and engine will run at malfunction
mode.

MAP/IAT

The circuit for MAR/IAT
Pins: No.1 Ground
No.2 Output signal of temperature
No.3 To 5V

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Chery QQ Maintenance Manual 465 EFI System

No.4 Output pressure signal

Out view of TPS

The section plane of MAP/IAT

1. Seal 2. Stainless steel bush

3. PCB plate 4. Sensor 5. Shell

6. Support 7. Welding connection

8. Felt connection

2. TPS

Usage: TPS is used to supply Throttle angle
signal. According to this signal, ECU will
receive engine load signal and working
condition signal such as starting, idle, back
up, partial load, and full load) as well as
acceleration and deceleration signal.
Constitute and pricinple:TPS is a angle
sensor with linear output. It consists of 2 arc
slide resistors and 2 slide arms. The shaft of
arm and throttle shaft connect to one axes.
When running throttle, arm run together and
slides on resistor. Putout UP as output
voltage. So it is a angle potentiometer.

Diagnosis: ECU check if throttle angle

exceeds the up limit or lower limit of output
signal. If so, ECU will judge TPS
malfunction, engine will run at malfunction
mode, MIL will on (Knock sensor or dirty
will cause engine malfunction).
Install: Screw torque for bolts:

1.5Nm-2.5Nm

Pins: Run throttle counterclockwise (see
from one side of sensor on shaft into
throttle):1.Ground 2. 5V source 3. 5V
source

3. Coolant temperature sensor TF-W
Usage: ECT is used to supply Coolant

temperature information for the timing and
fuel inject pulse width control on engine
start, idle, normal running.
Constitute and principle: ECT is a thermal
sense resistor with NTC. The resistance
decreases with coolant temperature increases,
but it is not in linearity. The resistor is
enclosed in copper bush. The change of
resistance is transformed into changing
voltage to ECU by a voltage distribute
circuit to monitor the change of water
temperature.

Diagnosis: When coolant temperature is

over up limit, or below lower limit, MIL is
on, engine run at malfunction mode. ECU
control ignition and fuel inject according to
set temperature. Fan runs at high speed.
Limit data: 2.5±5%KΩ

Diagram of TPS

Hint: Screw torque: 15±2Nm
Hint: There are 2 sensors in vehicle. One is
single pin water temperature and supply
water temperature signal for water temp
meter; The other is double pins and supplies
the temp signal to ECU.

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Chery QQ Maintenance Manual 465 EFI System

on engine. The sense element is a
piezoelectricity element. The vibration of
cylinder is transformed to piezoelectric
crystal through mass block in sensor. The
pressure of crystal produce voltage on two
polar faces and change vibration signal into
output AC voltage signal. Because the
frequency of vibration caused by engine
knock is much higher than normal frequency

Diagram of ECT

of engine vibration signal, so ECU can
distinguish knock and non-knock signals
after filtering the signal of KS. When engine
load, speed and coolant temperature exceed
gate value, and not set KS malfunction
information record, the signal of KS will be
used to close loop control for knocking.
When the control is actuated, the signal of
KS will input to ECU for integral after
amplify and filter. When certain integral
value in crank angle exceeds gate value,
ECU will consider the knock happens, and

The diagram of coolant tem sensor

Pins: There are 2 pins that could be

inter-exchangeable.

reduce 1 degree of ignition advanced-angle.
If knock happens on next cycle, ECU will
reduce 1 degree of ignition advanced-angle
again; If no knocks happen in next cycles,
ECU will resume the angle to normal value.

Diagnosis: ECU monitors each sensor,

actuator, power amplifier and check circuit.
KS will mark malfunction position once
following situations happen:

KS malfunction
KS control data process circuit

malfunction

Cylinder identification signal is

Coolant temp sensor

1. Connector 2. Sleeve 3. NTC resistor

4. KS
Usage: Supply knock signal to ECU for

knock control.
Constitute and principle:
KS is vibration acceleration sensor mounted

non-trustable
After KS marks the malfunction position,
knock close loop control will shut off and
reduce 1 safety degree for ignition
advanced-angle stored in ECU. When wrong
frequency is below set value, malfunction
position will resume.
Hint: Screw torque 20± 5Nm　 .

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three venomous ingredients such as HC, CO
and NOX in catalyzer.
Constitute and principle: The sense element
is a ceramic pipe with bores. The outside of
pipe is surrounded by exhaust of engine, and
inside is touched with atmosphere. The pipe
wall is one kind of solid electrolyte with
electric heating pipe in it to heat ceramic
body to 300 Cº for ceramic body to work.
The oxygen ion can pass pipe freely.
The concentration differential is transformed

KS with cable

into electric differential with this feature to
form electric signal. If mix air is richer,
electric differential and output voltage are
higher; if mix air is leaner, electric
differential and output voltage are lower.
The working voltage of sensor fluctuates
between 0.1-0.9V with 5-8 times every 10
seconds. Sensor is aging if the frequency is
below this value and needs replacing. The
sensor cannot be repaired.

Diagnosis: ECU monitors each sensor,

actuator, power amplifier and check circuit.
ECU will mark the malfunction position
for oxygen sensor once one of following
situations happen:
Battery voltage is not trustable.

The diagram of KS
Pins: pin 1 and pin 2 connect ECU, pin 3
connects shield.
The shield wire of sensor is folded on
outside of signal wire and connects to pin
19 on ECU. All shield wires on shielded
sensors connect to pin 19 on ECU.

5. Oxygen sensor
Usage: The sensor is used to supply the

information that if oxygen is superfluous
after the fuel in cylinder combusted
completely in intake air.ECU uses the
information to close-loop control for

MAP signal is not trustable.
Coolant temperature signal is not
trustable.
Injector driver is fault.
After marking malfunction position for
oxygen sensor, fuel ration close-loop
control will shut off and will be carry on
according to basic inject time stored in
ECU.
Install hint: The screw torque of sensor
is 50-60Nm. Smear anti-corrosion oil on
the sensor after replacing.

quantitative fuel and transforms or purifies

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6、ECU
Usage: ECU is central part of electronic

control system. Sensors supply every signal
for ECU. After calculation, ECU will
control the action of actuator such as
injector and ignition coil to control engine
operation.

Oxygen sensor

Constitute: There are shield shell and PC

board in ECU. Many electronic control units
are interated on the board to control EFI
system.

Install: ECU is fixed under instrument panel

by screws. Note to insert pins vertically
during installation, otherwise it will cause
terminals getting out to influence the normal
operation of engine.

The diagram of oxygen sensor
Oxygen sensor connects with cable. The
other end of cable is electric connector.
There is asbestos
Cover on outside.
Pins on connector:
No.1: Connect heat source (+)/white
No.2: Connect heat source (-)/white
No.3: Connect signal (-)/gray
No.4: Connect signal (+)/black

Output

Feature curve of oxygen sensor at 600 C　

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Out view and internal construction of ECU

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Chery QQ Maintenance Manual 465 EFI System

p

N

N

N

N

N

Pins on ECU

Power: The battery supplies voltage to ECU through pin 18. When main relay is on, battery
supplies voltage through pin 37 and when ignition switch is on, battery supplies voltage
through pin 27.
Attention: Pin 8 and pin 52 are used for making richer fuel/air mix during after-sale service.
They are mainly used on bad engine starting condition because of aging parts or bad part.

in Method 1 Method 2 Method 3 Method 4

degree

ot used Ground

ot used

ormal Thick Thicker Thickest

ot used Ground Ground

ot used Ground

Control method for pin 8 and pin 52

7. Fuel pump
Usage: Fuel pump feeds fuel with certain pressure and quantity to engine.
Constitute and principle: The pump consists of DC motor, vane motor and cover (together

with stop return valve, leak valve and anti-electromagnetic interference elements). The pump
and motor are mounted on same shaft and sealed in same shell. Pump and motor in shell are
surrounded by fuel for radiation and lubrication.
Battery supplies voltage to pump through pump relay. The relay only switches on pump
circuit during engine starting and running. When engine stops for malfunction, pump will stop
automatically. The maximum pressure on outlet of pump is decided by leak valve that is
between 450kPa and 650 kPa. But the pressure in whole fuel system fluctuates with the
fluctuating of intake manifold pressure. Fuel regulator decides the differential (usually is
300kPa ) between system pressure and manifold pressure.

Note: The temperature of fuel has great influence on pump function. When working under

high temperature for a long time, the pump pressure will drop rapidly if fuel temperature is
over certain value. If engine cannot be heat started, please check carefully whether the high
temperature working function is good.

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Fuel pump

The diagram of fuel pump

Pins: There are 2 pins on pump to connect pump relay. Marks “+”and“-”are cut on the shell
of pump.

8. Injector
Usage: Injector injects atomized fuel to engine in specified time according to instruction of

ECU.

Constitute and principle: ECU sends pulses to injector coil to form magnetic field force.

When the force increased enough to overcome the resultant force of spring pressure, weight of
needle valve and friction, needle valve begins to lift and inject process starts. The maximum
lift height of needle valve does not exceed 0.1mm. When inject pulses stop, needle valve
closes again by the pressure of return spring.
Install hint: The injector must use suitable connector.
In order to mounting easily, recommend to smear non-silicon clear oil on the surface of
O-ring connected with fuel distribution pipe. Pay attention to not pollute internal injector and
injector hole by oil.
Install injector to the seat vertically to injector seat, then clamp injector on the seat by clip.

Note: For long stopped vehicle, please check carefully if the fuel cohered blocks injector.

Diagnosis: S11 EFI system does not diagnose the injector itself, but diagnoses for injector

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driver. When injector driver is short to battery voltage or overload, short to ground or open,
ECU will mark malfunction position. Oxygen sensor close-loop control and self-study
pre-control will shut off. The last self-study data is effective. After troubleshooting,
malfunction position resumes.

Injector

The diagram of injector

Pins: There are 2 pins on each injector. One of pins marked (+) on side of shell connects pin
87 on pump relay, and another connects pin 17,16, 35, 34 on ECU.

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9. Step motor DLA
Function: Step motor with idle actuator offers by-pass intake air channel. When throttle

closes, air will enter engine through the channel. ECU can regulate the section of channel to
adjust mass airflow and adjust inject fuel amount. When engine works, ECU will control step
motor according to different working conditions to change the operation of engine. ECU
increases or reduces the section area of by-pass channel to increase or reduce engine speed to
realize engine close-loop control at idle.

Constitute and principle: Step motor is a micro motor that consists of several steel stators

and one rotor. A coil is reeled on each stator. Rotor is a permanent magnet with a nut on the
center. All stator coils is always connected with electricity. If changing current direction in
one coil, rotor will turn a degree. When current direction in each stator coil is changed in
suitable order, revolutionary field is formed to run rotor in certain direction.

Disgnosis: ECU can monitor the short or open of two coils for step motor and lights MIL.

Engine runs at malfunction mode.

Pins:
PinA: Connect pin 29 on ECU.
PinB: Connect pin 4 on ECU.
PinC: Connect pin 26 on ECU.
PinD: Connect pin 21 on ECU.

Step motor

The diagram of step motor

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10. Ignition coil ZSK-ROV
Function: Ignition coil transforms low voltage on primary coil into high voltage on

secondary coil and produces sparks through spark plug to light fuel-air mix in cylinder.
Constitute and principle: Ignition coil consists of primary coil, secondary coil, iron core and
shell. When battery voltage supplies on primary coil, the coil is charged. Once ECU cuts off
the return loop of primary coil, charging stops. The high voltage is induced in secondary coil
at same time.

Diagnosis: ECU does not have diagnosis function for ignition coil. So if ignition coil is fault,

DTC does not exist. It can judge if the coil works normally only by checking resistance of
ignition coil. Usually, ignition coil produces more heat during the working, but over heat of
coil will result in increasing for coil resistance. It will cause unstable running and
automatically stopping work for engine.
Primary coil: 0.47 ohms.
Secondary coil: 8 ohms.

Ignition coil( with distributor)

The diagram of ignition coil( with distributor)
Pins: There are 2 pins on low voltage side of coil. Pin marked (+) connects battery and the
other connects ECU.

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11. Canister control valve
Usage: The valve is used to control flux to clean canister. The valve is controlled by ECU

according to engine load, lasting time and frequency of pulses. The fuel vapor in canister will
accumulate to leak fuel for polluting environment. The function of canister solenoid is to open
the solenoid to pass superfluous vapor into intake air pipe to be in combustion.

Constitute an principle: The valve consists of magnetic coil, iron core and valve body.

There is filter on inlet. Mass flow through the valve is related with the frequency of electric
pulses that put out to control valve by ECU and with the pressure differential between inlet
and outlet. If no pulses, canister control valve will close. ECU controls the electrify time for
canister solenoid to indirectly control the mass flow of clearing air.

Diagnosis: ECU does not have diagnosis function for canister control valve, but can

diagnoses canister control valve driver. When canister control valve driver is short to battery
voltage or over load, short to ground and open, the basic self-study of fuel metering
close-loop control is shut off. If canister solenoid is fault, engine will be unstable idle or over
high idle.

Canister contorl valve

The diagram of canister control valve TEV-2
Pins: There 2 pins on canister control valve. One connects pin 87 on main relay and the other
connects pin 5 on ECU.

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12． Fuel pressure regulator
Usage: This regulator is not electric component, but it is used to regulate the fuel pressure in

fuel distribution pipe for gasoline engine electronic control system to keep constant value
with the differential of manifold. It controls fuel rate and makes easy for ECU to control fuel
inject pulse width.

Constitute and principle: As shown in the figure, a film made of rubber-fiber separates the

regulator to up and down chambers. The up chamber connects manifold through connector
with hose. There is a spring in the up chamber. The down chamber is filled with the fuel that
flows from the regulator through fuel inlet. The lower part of film gets the fuel pressure in
fuel distribution pipe and the upper part of film gets the pressure of manifold and spring force.
Film deforms to open or close the valve. Since the degree of deforming is very small, the
action force of the spring could be taken as constant. So the open and close of valve is
decided by the difference between the fuel pressure both in the lower chamber and the upper
chamber. If the valve is closed at first, the differential of pressure will increase because of
engine load reducing or fuel pressure increasing, which results lifting the film by fuel pressure
to open the valve. In this way, even the engine working condition is changed, the pressure
differential between fuel distribution pipe and manifold keeps constant. This is the basic
precondition for control fuel fixing quantity. In fact, when fuel flow increases, the differential
increases a little with linearity. When MAP pressure changing, the differential will change
little too.

Fuel request: The regulator can use the fuel according to the standard of “ Non-lead fuel for

vehicle” in GB 17930-1999 and “ The standard for controlling injurant in fuel” in GWKB
1-1999.

Fuel pressure regulator

The section of fuel pressure regulator

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Mounting position: The regulator is mounted on fuel supplying pipe with one end

connecting with the pipe, one with return fuel pipe to fuel tank, and the other end connecting
with intake air pipe to supply vacuum for the regulator.

13. Steel fuel distribution pipe assembly
Usage: To store and distribute fuel and return superfluous fuel into fuel tank. Injector and fuel

pressure regulator are mounted on the tank to offer stable pressure circumstance to balance
the fuel pressure and amount of fuel for smooth running of engine.

Constitute: The fuel distribution pipe assembly consists of injector(EV) , regulating valve

(DR) and fuel supply pipe assembly( KVS-S).

Install request: Clamp in/out fuel pipe and rubber hose with clip. The type of clip should be

matched with rubber hose to insure the seal between in/out fuel pipe and the hose.

Diagnosis: Usually, fuel supply pipe assembly is seldom to be fault. Mostly bad installing

causes the fuel leakage. Pay more attention during installation. Don’t install the seal that are
used.

Chapter 2 Basic principle for EFI diagnosis

(1) Fault information record

ECU continually detect the sensors, actuator, related circuit, MIL and battery voltage as well
as ECU itself, and carry on reliability test for sensor output signal, actuator drive signal and
internal signal such as oxygen close loop control, knock control, idle control and battery
voltage control. Once the malfunction in one point is found, or one signal is not true, ECU
will set the malfunction information record on RAM memory. The record exists as DTC form
and displays as the order of DTC appearing. 12 malfunction information records at most can
be stored in memory.
Malfunction can de divided as stable malfunction or temporary malfunction such as the fault
caused by short-lived, harness open or bad contact for inserters according to the frequency

(2) Malfunction statues

If the lasting time for one malfunction detected exceeds stable time settled, ECU will consider
it as a stable fault and stores it as “stable malfunction”. If it disappears, ECU will store it as
“temporary malfunction” or “not existing”. If it is detected again, it will be “temporary
malfunction”, but the existing history malfunction does not influence the normal use of
engine.

(3) Malfunction types

Short to positive pole of battery
Short to ground
Open (In the case of up or down resistors, ECU will identify the open fault in input terminal
as short between input terminal and battery positive pole or short to ground).

(4) Malfunction frequency counter

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Foe each malfunction detected, one independent frequency counter value (Hz) will be set.
The frequency counter value (Hz) will decide the storing time for store the malfunction
information to the stores when this malfunction disappears or eliminates.
When malfunction is detected first time, Hz is set to initial value 40. If fault statues do not
change, the value will keep on.
Once the malfunction detected disappears and keeps for a while, HZ will be deducted 1 when
starting engine or engine speed exceeds the speed after starting. ECU will consider the
malfunction disappears, but the record still exists.
If the fault such as bad contact frequently appears and disappears, Hz will increase 1 but does
not exceeds up limit 100.
If Hz is deducted to zero, the fault information records in the store will be cleared completely.

(5) Limp drive home

For some important faults detected, if their lasting time exceeds the setting stable time, ECU
will apply some software methods, for example, to close some control function of oxygen
sensor close loop control and set substitute value for some unbelievable value. At the moment,
through the working condition of engine is not so good, but the vehicle can be drive home. In
this way, vehicle can drive home or service station for repairing to void stop on road. Once
the fault detected disappears and Hz deducted to 40, the normal values will be used again.

(6) Warning

Some M1.5.4 system vehicles equip MIL. When some important parts such as ECU, MAP,
TPS, ECT, KS, O2, phase sensor, injector, idle actuator, 2 drive poles of step motor, canister
control valve, fan repay are fault, ECU will turn MIL on and warning until the faults
disappear.

(7) Fault read out

The malfunction information records can be read out from ECU by tester, or be read by
flashing DTC codes. If the faults relate the function of fuel/air mix ratio regulator, engine will
read malfunction information records after running at least 5 minutes.

Fig. 3 ISO 9141-2 Standard diagnosis connector

Read DTC by flashing light
The flashing DTC is the DTC which could be read out by flashing light in MIL. In the vehicle

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equipped MIL, MIL will be flashing light. The other end of K terminal connects pin 55 of
ECU.

Method: Turn on ignition switch, but not run engine. Use K terminal to ground pin 55 of

ECU for 2.5s or more. The light will flash. Flashing DTC is 2 digits with hexadecimal, and
each digit consists with o or 1-9. Every light on will last 0.3s, and is on again after 0.3s. The
flashing times mean one digit. If flashing 10 times, it means 0. First flashing means high
position number and later flashing means low position number. There 1 second between 2
digits. After 2 numbers displayed, it will flash again after stopping 3s and display some
number. One number will flash 2 times (totally flash 3 times). Then the next one. The process
circles until engine start again or ignition switch turns off, or ground pin 55 with K line for
more than 2.5s. According to DTC, the malfunction, position, condition, solving or reset
condition can be found in “malfunction information record set condition” in this manual can
be found.

(8) Clear DTC

When eliminate the faults, DTC should be cleared. There are 5 methods:
For DTC appears on igniting but not keeps on to stable time, it will not be recorded.
When Hz reach to zero, DTC in store will be cleared automatically.
Clear DTC by using tester with the order of “clear DTC”.
Remove ECU terminals or battery terminals to clear DTC outside of RAM.
Ground pin 55 of ECU 2 times for more than 2.5s.

(9) Finding faults

Getting above DTC means only to know the faults position, but not the real fault because the
reason for one fault may be the electric or mechanical one such as sensor, ECU or actuator
damage, or open circuit or short circuit or even mechanical damage.
Fault is internal, but the appearances are various. Firstly use tester or flashing light to check if
existing any DTC, and troubleshoot the faults accord to DTC, then find the reason of fault
according to engine symptom.

4． The condition for malfunction information record

No.

1

Malfunction

information

name

Knock
control ， test

pulse, zero

test

malfunction(

Condition:

The condition for

marking malfunction

position

In continues test pulse

measuring, the

frequency that pulse

integral value is equal or

below gate value of

voltage exceeds the set

value.

Software method during

malfunction happens

Setting KS, harness or

hardware malf-

unction:

Ignition advanced angle

reduced to a safety value:

If load signal( mass flow for

Flash

- ing

code

1

The resume

position

condition

Fault frequency

does not exceed

set value

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2

3

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Chery QQ Maintenance Manual 465 EFI System

Engine RPM

is below

5000, Engine

temp is equal

or below gate

value for

actuating

knock control,

or mass flow

for each turn

is equal or

below gate

value for

knock control

No

malfunction

A/C

evaporator

temp is not

trustable

TPS signal is

In continues zero test,

the f

integral value is over

gate value of voltage

exceeds the set value.

In thcontinues integrator

original voltage testing,

the frequency that

integrator original

voltage is below the

maximum value exceeds

e set value.

In continues integrator

original voltage testing,

the frequency that

integrator original

voltage is over the

maximum value exceeds

the set value.

11

A/C evaporator temp is

below low trustable limit

A/C evaporator temp is

over up trustable limit

TPS angle is over the

upper limit

requency that pulse

each turn) is over gate value

for knock control, and engine

temp is over gate value for

actuating knock control, the

ignition will put off a safety

angle for knock control.

A/C evaporator temp= A/C

evaporator temp substitue

value

TPS angle =TPS angle

substitute val-

13 A/C evaporator

14 angle resumes

Fault frequency

does not exceed

set value

Fault frequency

does not exceed

set value

Fault frequency

does not exceed

set value

temp resumes

between the up

and lower limit

between the up

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not trustable

TPS angle is below
upper limit

5 KS When RPM exceeds the Set malfunction signal record 15 Fault frequency

ue Setting TPS mal-

function position.

Only in shuting off fuel it

will be dealed with idle.

Partial load and fully load

can be identified only. If

actual mass flow is below the

gate value at idle substitue

condition during TPS is in

malfunction, and it is in shut

ing off fuel, idle emergrmcy

running could be carried. If

actual mass flow is over the

sum of gate value and

allowed defferential value,

idle emergrmcy running

could not be carried.

If load signal( mass flow for

each turn) is over the load

gate value in full load

substitute condition during

TPS is in malfunction, and

the RPM is over the RPM

gate value in full load

substitute condition during

TPS is in malfunction,

engine will run at full load

condition. If one of

conditions can not be

satisfied, it does not run at

full load condition.

Now close the trigger for

transition working condition

initial compensation function

related with TPS.

Don’t permit to open the

buffer function for idle

control and the self-study

function of idle air.

Set idle controller integrator

to zero.

between the up

and lower

limits.

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malfunction gate value to activate

6 MAP signal is

not trustable

7 O2S signal is

not trustable

for KS, harness and

diagnose KS

malfunction, the

reference voltage to

diagnose KS

malfunction will be

below its gate value.

hardware: Iignition advanced

angel is reduced to a safety

value. If load signal( mass

flow for each turn) is over

gate value for knock control,

and engine temp is over gate

value for actuating knock

control, the ignition will put

off a safety angle for knock

control. Full load ignition

will be put off same safety

angle for knock control.

MAP pressure is over

the trustable upper limit

In non-start working

condition or engine

RPM is below the gate

value to diagnose MAP

malfunction, MAP

pressure is below the

trustable upper limit

Set malfunction information

mark for main load sensor.

Take the laod information

(mass flow for each turn) as

load signal input according

to TPS angle and RPM:

Select ignition advanced

angel:

If TPS is fault, set two fixed

emergency running signal

according to below or over

the gate value for RPM.

Close O2S closed-loop

control self-study ( the data

at moment is effective).

Close idle closed-loop

control self-study ( the data

at moment is effective).

O2S signal keeps over

the upper limit for over

Close O2S closed-loop

control

the specified time (short

to battery voltage).

does not exceed

set value

16 MAP pressure

resumes

between the up

and lower

limits.

17

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Chery QQ Maintenance Manual 465 EFI System

8

O2S injecting

closed-loop

control

correct

coefficient

is not

trustable

9 Over

maximum

RPM

10

ECU

malfunction

Under the condition of

satisfying O2S normal

operation, the signal

Close O2S closed-loop

control

voltage keeps over the

specified time between

gate values for rich mix

or lean mix ( open

circuit)

O2S signal keeps below

the lower limit for over

the specified time (short

to battery voltage).

Close self-study pre-control

for O2S closed-loop control,

canister cleaning and O2S

closed-loop control:

Make O2S closed-loop

control correct coefficient

=1.4s.

O2S signal voltage is

below lower limit, and

inject time for O2S

closed-loop control

correct coefficient keeps

Close O2S closed-loop

control, and make the upper

limit for injecting

closed-loop control correct

coefficient equal to old one.

over 1.4s (short to

ground)

The injecting

closed-loop control

correct coefficient equals

to the upper limit for

over 10s.

Non 31

The closed-loop

out voltage is in

the scale of

adjusting

The injecting

closed-loop control

correct coefficient equals

to the lower limit for

over 10s.

Over maximum

identifying malfunction

Non 33

Not over RPM

RPM

ROM/EPROM

malfunction

RAM malfunction Troubleshooting

Knock control data

processing circuit ( zero

test, pulse test)

malfunction

Set malfunction information

record for KS, harness or

hardware:

Reuce ignition advanced

angle to a safety degree.

Other conventional function

is still possible

34

Troubleshooting

Troubleshooting

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Chery QQ Maintenance Manual 465 EFI System

11 Self-study for

injection time

addition of

O2S

closed-loop

control

12 Self-study for

injection time

multiplication

of O2S

closed-loop

control

13 Self-study for

leaked air

addition of

O2S

closed-loop

control

14

Battery

voltage is nort

trustable

Mix self-study addition

factor of injector is over

th

stroke

Mix self-study addition

factor of injector is

below the lower limit for

each stroke

Mix self-study

multiplication factor of

injector is over the upper

limit

identification

Mix self-study

multiplication factor of

injector is below the

lower limit for

malfunction

identification

Mix self-study addition

fac

ov

malfunction

identification

Mix self-study addition

factor of leaked air is

below the lower limit for

malfunction

identification

Battery voltage is over

the trustable upper limit

In non-start working

condition, the battery

voltage is below the gate

value. The lasted time is

over permitted lasting

time of voltage dropping

after starting.

e upper limit for each

for malfunction

tor of leaked air is

er the upper limit for

Non 35

Mix self-adapt

addition factor

of injector is

between the

upper limit and

lower limit

Non 36

Mix self-adapt

multiplication

factor of

injector is

between the

upper limit and

lower limit

Non 37

Mix self-adapt

addition factor

of leaked air is

between the

upper limit and

lower limit

Close O2S closed-loop

control self-study and idle

control air self-study, and the

last data is effective.

38

Battery voltage

resumes to

normal value

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Chery QQ Maintenance Manual 465 EFI System

15 Speed signal

is not

trustable

Engine RPM is over the

lowest

identifying speed

malfunction. Load signal

( mass flow for each

turn) is over the load

gate value for

identifying speed

malfunction. Speed

signal is below lower

limit for identifying

speed malfunction.

Above 3 conditions

lasting time is over the

lasting time for

identifying speed

malfunction.

gate value for

Make speed =substitute for

non-trustable speed

41

Engine RPM is

over the lowest

gate value for

identifying

speed

malfunction.

Load signal

( mass flow for

each turn) is

below the load

gate value for

identifying

speed

malfunction.

Speed signal is

not below lower

limit for

identifying

speed

malfunction.

Speed signal is over

upper limit for

identifying speed

malfunction. It’s lasting

time is over the lasting

time for identifying

speed malfunction.

Engine RPM is

over the lowest

gate value for

identifying

speed

malfunction.

Load signal

( mass flow for

each turn) is

below the load

gate value for

identifying

speed

malfunction.

Speed signal is

not below lower

limit for

identifying

speed

malfunction.

16 Short to battery voltage Non 42 Eliminate

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Chery QQ Maintenance Manual 465 EFI System

malfunction

17

CYL

identification

signal is not

trustable

Short to ground Eliminate Fan relay

Open circuit

No TDC mark

malfunction, and no

activating phase sensor,

camshaft RPM reaches a

certain value

No TDC mark

malfunction, and the

Forbid to trigger cylinder

43

number accounter:

If load signal( mass flow for

each turn) is over gate value

for knock control, and engine

temp is over gate value for

actuating knock control, the

ignition will put off a safety

angle for knock control.

time of phase signal is

over set value.

18

MIL driver

malfunction

19

Idle actuator

EWD3 and

step motor

driver

malfunction

Short to ground Elimilate

Short to Battery Elimilate

Open circuit

Short to ground Elimilate

Short to Battery Elimilate

Open circuit Elimilate

load short

Non 45

No substitute

Close idle closed-loop

control feature curv

self-study and air self-study

function, and the last data is

effective.

Make feature curve

self-study=EPROM value.

EWD

3 and

No1.

driver

61 of

step

motor

,

No2.

driver

of

step

motor

The steps for diagnosis according to malfunction information record

DTC 13 A/C evaporator outlet temperature sensor

Eliminate

Under the

condition of

correct signal,

RPM of

crankshaft

exceeds a set

value.

Elimilate

Elimilate

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Chery QQ Maintenance Manual 465 EFI System

The diagram for A/C evaporator temperature sensor

No. Operation steps Test

Next step

results

1

“ON”.Turn on ignition key.

Next

Yes N ex t 2 Pull out connector of A/C evaporator temperature

sensor, measure if the volt between 2 pins is 5V

No 4

with multimeter.

Yes Replace sensor 3 Check any open or short between 2 pins with

multimeter.

4 ECU and harness, check any open or short

between pin 30 , 39 of ECU and pin (1) and (2) of

No Replace ECU

Yes Repair or replace

harness

sensor with multimeter.

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

DTC 14 TPS

The diagram of TPS

No. Operation steps Test

Next step

results

1 Turn on ignition key. Next

Yes N ex t 2 Pull out connector of A/C evaporator temperature
sensor, measure if the volt between 2 pins is 5V
with multimeter.

5

No

Yes N ex t 3 Measure the resistance between pin (1) and (2) if
in 1.6 to 2.4k with multimeter.

No Replace sensor

Yes Replace sensor 4 Run slowly TPS from one end to another and
check any open or short between pin (1) and (3).

No Replace ECU

5 Connect adaptor between ECU and harness,

check any open or short between pin 12 , 30 of
ECU and pin (1) and (2) of sensor with

Yes Repair or

replace harness

No Replace ECU

multimeter.

Note: For M1.5.4 with distributor, 5V voltage is supplied by pin 12 of ECU to TPS and Hall
sensor. If the DTC dislays when vehicle cannot be started, it cannot be clear DTC from TPS.
Please check if short in Hall sensor.

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Chery QQ Maintenance Manual 465 EFI System

DTC 15 KS

Diagram for KS

No. Operation steps Test

results

1 Turn off ignition key, engine nor run.

Next

Next step

2 Pull out connector of KS sensor, measure if the

resistance between pin 1, pin 2 of sensor and

between pin1 and pin 3 is over 1M with multimeter.

3 Slightly knock around sensor with small hammer

and check if any AC signals putout between pin1

and pin2 of sensor.

4 Turn on ignition key but engine not run

Connect adaptor between ECU anfd harnesses and

check any open or short between pin 11, pin 30,

pin19 of ECU and pin 1 and pin2 and pin 3 with

multimeter.

Yes N ex t

No

Replace sensor

Yes N ex t

No Replace sensor

Next

Yes Repair or replace

harness

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

DTC 16 MAP and IAT

Diagram of MAP and IAT

No. Operation steps Test

Next step

results

1 Turn on ignition key. Next

Yes 4 2 Pull out the connectors on harness of

MAP and IAT and check if the voltage
between pin1 and pin 2 is 5V with

No Next

multimeter.

3 Connect the adaptor between ECU and

Yes Repair or replace

harness, check if open or short between
pin 30, pin 12, pin 7 of ECU and pin 1,

No Next

pin 3, pin 4 separately with multimeter.

4 Turn on ignition key but engine not run

Next

5 Put on N shaft and run engine at idle. Step

Yes Replace ECU

down accelarate pedal to fully open.
Check if the voltage between pin 4 and

No Replace ECU or

pin 1 of sensor is incrasing with
multimeter.

harness

sensor

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Chery QQ Maintenance Manual 465 EFI System

DTC 17 Oxygen sensor

The diagram of oxygen sensor

No. Operation Steps Test result Next step

1 Turn on ignition key. Next

Yes N ex t 2 Put out the connector on oxygen sensor and
check if the voltage between pin 1 and pin 2 is
12 V.

No 4

on oxygen sensor is from 6 to 25.

out.

5 Check if open or short between pin 1 on sensor

and pin 87 on fuel pump relay, check open or
short between pin 2 and pin 59.

6 Insert the connector of oxygen sensor harness.

Put N shaft and run engine at idle to normal
coolant temperature.

check if ther is any 0.1 –0.9 V output voltage
between pin 4 and pin 3.

8 Connect adaptor between ECU and harness.

Check if open or short between pin 10 on ECU,
pin 28 and pin 3, pin 4 separately.

DTC 18 IAT

Yes Replace ECU 3 Check if the resistance between pin 1 and pin 2

No Replace sensor

Yes Replace 4 Check if the fuse of heated oxygen sensor burns

No Next

Yes Repair or replace

harness

No Next

Next

Yes N ex t 7 Put out connector on oxygen sensor harness;

Yes Replace sensor

Yes Repair or replace

harness

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

The diagram of MAP and IAT

No. Next Steps Test result Next step

1 Turn on ignition key. Next

Yes N ex t 2 Put out the connectors on MAP and IAT

harness.Check if the voltage between pin
1 and pin 3 is 5 V.

No 4

and pin 2 is suit to the temperature ( see
related parts in this manual).

4 Connect the adaptor between ECU and

harness. Check if open or short between
pin 30, pin 12, pin 44 on ECU and pin 1,
pin 3, pin 2 separately.

Yes Replace ECU 3 。Check if the resistance between pin 1

No

Replace sensor

Yes Repair or replace

harness

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

DTC 19 Coolant temperature sensor

The diagram of CTS

No. Next Steps Test result Next step

1 Turn on ignition key. Next

Yes tNext 2 Put out the connector on CTS harness, check if

the voltage between pin 1 and pin 2 is 5V.

No 4

Yes Replace ECU 3 Check if the resistance between pin 1 and pin 2
is suit to the temperature ( see related parts in
this manual).

4 Connect the adaptor between ECU and harness.

Check if open or short between pin 30, pin 45
on ECU and pin 1, pin 2 separately.

No

Replace sensor

Yes Repair or replace

harness

No Replace ECU

DTC 22、23、24（、21） in CYL 1, CYL 2, CYL 3 (CYL 4) injector driver

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Chery QQ Maintenance Manual 465 EFI System

The diagram of injector

No. Next Steps Test result Next step

1 Turn on ignition key without engine run. Next

2 Put out al connectors on injector harness;

Next

connect two probes of multimeter on pin 1 and

engine ground.

3 Turn on ignition key. See if the display on

multimeter is 12 V for 1 second once turning on

the key.

4 Use multimeter to check if open or short

between pin 87 on pump relay output and pin 1

on each injector.

5 Repair or replace pump replay, main repalay

and circuit.

Yes Repeat step 2

Yes 6

No Next

Yes Repair or replace

harness

No Next

Yes Repair or replace

harness

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Chery QQ Maintenance Manual 465 EFI System

6 Connect the adaptor between ECU and harness.

Check if open or short between pin 17, pin 16,

pin 35, pin 34 on ECU and pin 2 on each

injector separately.

7

Use multimeter to check if resistance between

pin 1 and pin 2 on injector is 12—16V in
20 C　 .

run engine at idle. Put out each injector

connector in turn and check if the vibration of

engine becoe serious.

No Next

Yes Repeat step 7

Yes N ex t

No Replace

electromagnetism

injector

Yes Repeat step 8 8 Reinsert all injector connector. Put N shaft and

No Replace ECU

DTC 25 Canistor control driver

Main relay

Pin 87

canistor
control

valve

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Chery QQ Maintenance Manual 465 EFI System

Diagram of canistor control valve

No. Next Steps Test

1 Run engine at idle to normal coolant

result
Next

Next step

temperature.

Yes N ex t 2 Put out the connector on canistor valve and
check if the voltage between two pins is 12
V.

No 5（Check live

wire）

Yes N ex t 3 Reinsert conncetor of canistor valve
harness. Run engine to 1500 RPM. Touch
valve with hand and check if any slightly
viabration or impact on valve.

No 7（Check ground

wire）

Yes ReplaceECU 4 Use multimeter to check if resistance
between pin 1 and pin 2 is 22—30.

5 Use multimeter to check if open or short

between pin 87 on main relay and pin 1 on
valve.

No Replace canister

control valve

Yes Repair or replace

harness

No Next

6 Repair or replace main relay and circuit.

7 Shut off engine. Connect adaptor between

Yes Repair or replace
ECU and harness. Use multimeter to check
if open or short between pin 5 on ECU and

No Replace ECU

pin 2 on valve.

harness

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Chery QQ Maintenance Manual 465 EFI System

p

DTC 45 MIL driver

ower

MIL

The diagram of MIL

NO. Next Steps Test

Next step

result

1 Turn on ignition key Next

Yes N ex t 2 Remove instrument panel. Put out MIL bulb. Use

multimeter to check if the voltage in MIL socket is
12 V.

No 5（Check live

wire）

Yes N ex t 3 Use multimeter to check if MIL bulb is good.

No Replace bulb.

4 Connect the adaptor between ECU and harness.

Check if open or short between pin 33 on ECU and
input connector of MIL.

Yes Repair or replace

harness

No Replace ECU

Yes Replace fuse 5 Check if the fuse in oxygen heating circuit is burn

out.

No Next

6 Use multimeter to check if open or short between

pin 87 on main relay and pin 1 on MIL socket.

Yes Repair or replace

harness

No Next

7 Repair or replace main relay and circuit.

In vehicle equipped with MIL, when other fault information is recorded, MIL will be on
except the fault of A/C evaporator temperature sensor, fuel pump driver and canistor control
valve.

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Chery QQ Maintenance Manual 465 EFI System

DTC 61,62 No. 1 and No.2 coil driver in step motor

The diagram of idle actuator/step motor

No. Operation steps Test

Next step

results

1 Turn on ignition key but engine not run. Next

Yes N ex t 2 。Put out the connector on step motor and
check if the resistance between pin A, pin
D,and pin B, pin C is 40—80.

No Replace idle

actuator

Yes N ex t 3 Use multimeter to check if the resistance
between pin A and pin B as well as Pin B
and pin D are infinite.

No

Replace bulb or
actuator

4 Use multimeter to check if voltages between

Yes Replace actuator
pin A and pin D as well as pin B and pin C
are 12V　 .

5 Connect adaptor between ECU and harness.

Use multimeter to check if open or short

No Next

Yes Repair or replace

harness
between pin 29,pin 4, pin 26, pin 21 on
ECU and pin A, B, C D on step motor.

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

6. The diagnosis steps according to engine symptoms
Before beginning diagnosis steps according to engine symptoms, the primary checking should
be carried out:
(1) Make any abnormal situation for ECU and MIL (except vehicle without MIL).
(2) Use diagnoses instrument or flashlight to check to insure no any malfunction information

records.

(3) Use diagnoses instrument to check the idle data on heated engine of EFI system to insure

everything is OK.

Name Parameter
Intake temperature: tans 20-70 C　
Battery voltage: ub 12-14V
Engine coolant temperature: tmot 80-90 C　
Engine load:tl 1.8-3.0ms
A/F ratior 5%-5%
Ignition advance angle 5-10 CA　
Throttle angle of rotation wdkbl 0
Injection time 4-7ms
Engine speed n Expected idle±50rpm
Canistor control valve ratio 0
Self adaption for F/A ratio:xfra 0.95-1.05
Self adaption for F/A ratio:xtra 120-140
Intake manifold absolute pressure 350-650hPa
Oxygen sensor voltage 0.1-0.8V
Intake quantity 6-12kg/h
Idle adjust state 60-100

(4) Make sure the sysptoms that driver told exisist and check the exact position of sysptom.

Then begin appearance check:
Check if clear or substance on harness ground.
Check if any break, tweast in vaccum pipe or if connect correctly.
Check if any block in vaccum pipe.
Check if any stave or damage on intake air pipe.
Check if the seal between throttle body and manifold is good.
Check if any break, aging on high voltage line in ignition system or connect correctly.
Check if the connection of wires is correct or any loose/bad contact on connector.

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Chery QQ Maintenance Manual 465 EFI System

1） Engine does not run or run slowly on starting

No. Operation steps Test step Next step

Yes N ex t 1 Check if the voltage between two poles on

battery is 10—12.5 V.

positive poles of battery connected with the key

is 10—12.5 V.

voltage on positive pole of stater connected with

ignition key is 8V.

voltage on positive pole of stater is 8V.

5

No Repair or replace

battery

Yes N ex t 2 Turn on ignition key. Check if the voltage on

No Repair poles or replace

wires

Yes N ex t 3 Keep ignition key on start position. Check if the

No Replace bulb, replace

actuator, repair or

replace ignition key

Yes N ex t 4 Keep ignition key on start position. Check if the

No Repair poles or replace

wires

Yes Repair or replace start

Use multimeter to check if open or short for

starter.

No Next

motor

Yes trouble shooting 6 Check if engine blocks for bad lubrication.

No Next

Yes Replace suitable oil 7 If in winter, check if the resistance of starter is

too big that resulted by wrong lubricant or gear

oil.

No Repair or replace

timing belt

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Chery QQ Maintenance Manual 465 EFI System

2） Engine can run but cannot start successfully (with distributor)

No. Operation steps Check step Next step

1 Turn on ignition key. Use tester to check if

malfunction information record exisits.

Yes Eliminate

malfunction

No Next

Yes 8 2 Pull out cylinder wire and connect ignition plug

with the electrode 5—10mm from engine body.

No Next

Run engine with starter and check if high voltage
ignition in blue and white appears.

Yes Ne xt 3 Check if the resistance of high voltage wire is

normal (about 16k/ m. For exact data, please
touch manufacture).

No Repair or replace

high voltage wire

Yes Replace 4 Check if any ablation damage or crack on

distributor cove and distributor.

No Next

Yes Replace 5 Check if any loose or damage for identification

ring in distributor.

No Next

Yes N ex t 6 Check if ignition coil is normal.

No Replace

Yes N ex t 7 Check if distributor and high voltage coil

inserter is good.

No Connect plug

Yes N ex t 8 Turn on ignition key. Check if fuel pump relay

and fuel pump can work for 3 seconds.

No Repair fuel pump

circuit

Yes N ex t 9 Connect fuel pessure gauge valve. Short pin 30
on fuel pump relay and pin 87 to start fuel pump.
Check if fuel pressure is 250—300 kPa.

No 13

Yes 12 10 Pull out fuel distribution pipe together with
injector. Pull out injector connector on harness.

No Next

Supply 12V voltage directly from battery to
injector. Check if injector can inject fuel.

Yes N ex t 11
Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel oil 12 Check If fuel deteroprate or containing water.

No 18

Yes N ex t 13
Check if fuel pressure below 250kPa.

14

Yes Ne x t

No 17

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Chery QQ Maintenance Manual 465 EFI System

Shut off fuel gauge valve. Connnect ignition key

No 16

again to run fuel pump for 3 seconds. Check if

fuel pressure can be set up.

15

Yes Replace oil pressue

Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if

fuel pressure can be set up soon.

16

Check if fuel pipe is leaked or blocked.

17

Check returning fuel pipe is blocked or bend.

18

Connect adaptor between ECU and harness.

Check if voltage exisit on pin 18,27,37. Check if

the positive source on above pins and ground

regulator

No Repair or replace

injector and oil pipe

Yes Repair or replace oil

inlet

No Replace fuel pump

Yes Repair or replace oil

return pipe

No Replace fuel pressure

regulator

Yes Ne x t

No Repair or replace

harness

wires of pin 2,14,24,19 on ECU are normal.

19

Check if intake air system parts are leakage.

20

Check if MAP or IAT are blocked.

21

Check if ECT is normal.

22

Check if engine cannot start because mechanical

reason such as cylinder head spacing and

cylinder leakage.

Chery Automobile Co., Ltd

Yes Re p ai r

No Next

Yes Repair or replace

No Next

Yes N ex t

No Repair or replace

Yes Eliminate

malfunction

No Replace ECU

39

Chery QQ Maintenance Manual 465 EFI System

3） Heat start difficult

No. Operation steps Test

results

1 Turn onignition key. Use tester to check if

malfunction information record exisits.

Yes Eliminate

malfunction

Next step

No Next

Yes N ex t 2 Connect fuel pessure gauge valve. Short pin 30 on

fuel pump relay and pin 87 to start fuel pump.

No 9

Check if fuel pressure is 250—300 kPa.

Yes N ex t 3 Disconnect fuel pipe. Shut off ignition key. After 1
hour, check if pressure in fuel system can keep
150—200 kPa.

4 Connect fuel pipe. Use returning fuel blocker to

block returning fuel pipe and shut off fuel pressure
gauge valve. Shut off ignition key. After 1 hour,

No Repair fuel system

leakage

Yes Replace fuel pressure

regulator

No Next
check if pressure in fuel system can keep 150—200
kPa.

5

Check if injector and fuel pipe leaks fuel.

Yes Replace injector and

oilpipe

No Next

6 Pull out water temperature sensor connector and

run engine. Check if engine can start.

Yes Check coolant

temperature and
circuit

No Next

Yes N ex t 7 Connect adaptor between ECU and harness. Check
if voltage exisit on pin 18,27,37. Check if the
positive source on above pins and ground wires of

No Repair or replace

harness

pin 2,14,24,19 on ECU are normal.

Yes Harness 8 Replace fuel and heat start engine again. Check if
engine can start.

No Replace ECU

Yes N e xt 9 Check if fuel pipe blocked or bend, or if fuel pump
regulator can work normally.

No Repair or replace

Yes N ex t 10 Use multimeter tocheck if voltages between two
ends of fuel pump inserter exists.

No Repair or replace fuel

pump relay and
leading line

Yes N ex t 11
Check if fuel pump resistance is correct.

No Replace fuel pump

Yes Replace fuel pump 12
Check if fuel pump blocked.

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

4） RPM is normal but difficult in starting

No. Operation steps Test

Next step

results

1 Turn on ignition key. Use tester to check if

malfunction information record exists.

Yes Eliminate

malfunction

No Next

Yes N ex t 2 Check if air filter is through.

No Replace

Yes N ex t 3 Check if MAP pressure is 35—65 kPa at idle

after start.

No Eliminate intake

system leak

4 Step down throttle slightly and check engine can

start easily.

Yes Replace or check

throttle valve

Yes N ex t 5 Connect fuel pressure gauge valve. Short pin 30

on fuel pump relay and pin 87 to start fuel pump.

No 9

Check if fuel pressure is 250—300 kPa.

Yes 8 6 Use special connector to supply 12 V voltage

from battery to injector and check if injector

No Next

works normally.

Yes N ex t 7 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 8 Replace fuel. Check If fuel deteriorates or

contains water.

No 14

Yes N ex t 9 Check if fuel pressure below 250kPa.

No 13

Yes N ex t 10 Shut off fuel gauge valve. Connect ignition key

again to run fuel pump for 3 seconds. Check if

No 12

fuel pressure can be set up.

11 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if
fuel pressure can be set up soon.

Yes Replace fuel

pressure regulator

No Repair and replace

injector or fuel pipe

12 Connect fuel pessure gauge valve. Short pin 30

on fuel pump relay and pin 87 to start fuel pump.
Check if fuel pressure is 250—300 kPa

13

Check returning fuel pipe is blocked or bend.

Yes Repair and replace

fuel pipe

No Replace fuel pump

Yes Repair or replace

returning fuel pipe

No Replace fuel

prassure regulator

Yes N ex t 14 Pull out idle actuator connector before coolant

temperature reaches 35 C　 and check if engine
speed is dropping.

No Repair or replace

idle actuator

15 Yes Next

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Chery QQ Maintenance Manual 465 EFI System

Turn on ignition key. Check voltages on

following pins are normal: 12 V for pin 27 and

No Check harness or

connector

zreo for pin 14 and 19.

Yes N ex t 16 Run engine at idle. When coolant temperature

reaches normal, ground pin 51 and check if
ignition advance angle is 6.75 　 crank angle.

No Adjust ignition

advance angle

Yes N ex t 17 Check if cylinder compressed pressure is normal.

No Trouble shooting

Yes Repair or replace 18

Check if MAP and IAT blocks.

No Next

Yes Replace ECU 19 Check if coolant temperature sensor is normal.

No Repair or replace

5）Cold start difficult

No. Operation steps Check

results

1 Turn on ignition key. Use tester to check if

malfunction information record exists.

Yes Eliminate

malfunction

Next step

No Next

Yes N ex t 2 Use multimeter to check if coolant temperature
sensor is normal. Or link 1.5k resistors between
pin 45 and pin 30 on ECU to relace coolant

No Replace sensor

temperature sensor for starting engine. If engine
can start, coolant temperature sensor is normal.

Yes N ex t 3 Turn on ignition key. Check if voltages on
following pins are normal: 12 V for pin 27 and
zreo for pin 14 and 19.

No Check harness and

connector

Yes N ex t 4 Check if air filter is through.

No Replace

Yes N ex t 5 Check if MAP pressure is 35—65 kPa at idle
after start.

6 Step down throttle slightly and check engine can

start easily.

No Eliminate intake

system malfunction

Yes Check throttle and

idle pass

No Next

Yes N ex t 7 Pull out idle actuator connector before coolant
temperature reaches 35 C　 and check if engine
speed is dropping.

8 Connect fuel pressure gauge valve. Ground pin

No Repair or replace idle

actuator

Yes N ex t

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Chery QQ Maintenance Manual 465 EFI System

86 on fuel pump relay. Turn on ignition key to

No 12
run fuel pump relay anfd fuel pump to check if
fuel pressure is 250—300kPa.

Yes 11 9 Use special connector to supply 12 V voltages

from battery to injector and check if injector

No Next
works normally.

Yes N ex t 10 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 11 Check if fuel deteriorate or containing water.

No 17

Yes N ex t 12

Check if fuel pressure below 250kPa.

No 16

Yes N ex t 13 Shut off fuel gauge valve. Connect ignition key

again to run fuel pump for 3 seconds. Check if

No 15
fuel pressure can be set up.

14 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if
fuel pressure can be set up soon.

Yes Replace fuel pressure

regulator

No Repair or replace

injector and fuel pipe

15 Check if fuel pipe is leaked or blocked.

Yes Repair or replace

intake fuel pipe

No Replace fuel pump

16 Check returning fuel pipe is blocked or bend.

Check if intake air system is leak.

Yes Repair or replace

returning fuel pipe

No Replace fuel pressure

regulator

Yes N e xt 17 Check if cylinder compressed pressure is normal.

No Troble shooting

Yes R ep ai r 18

No Next

Yes Repair or replace 19 Check if MAP and IAT blocks.

No Replace ECU

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Chery QQ Maintenance Manual 465 EFI System

6）Unstable idle at any situation

1 Turn on ignition key. Use diagnostic equipment

to check if malfunction information record exists.

Yes Eliminate

malfunction

No Next

2 Check if EWD3 idle actuator or step motor

actuator blocked.

Yes Repair or replace idle

actuator

No Next

3 Turn on ignition key. Connect adaptor between

ECU and harness. Check if voltages on pin 44,45
( output signal for IAT and ECT), pin 21,29,4,26
(output signal for stepmotor) and pin 4, 26 (for
EWD3) are normal.

one and check if engine speed is dropping or
fluctuates.

normal (about 16k/ m. For exact data, please
touch manufacture).

distributor cove and distributor.

and pin 87 of fuel pump relay to start fuel pump.
Check if fuel pressure is 250—300 kPa.

from battery to injector and check if injector
works normally.

Yes Check harness and

connector

No Next

Yes 8 4 Run engine at idle. Shut off each cylinder one by

No Next

Yes N ex t 5 Check if each injector works normally.

No Check injector and

harness

Yes N ex t 6 Check if the resistance of high voltage wire is

No Replace

Yes `Replace 7 Check if any ablation damage or crack on

No Next

Yes N ex t 8 Check if spark plug is normal.

No Replace spark plug

Yes N ex t 9 Connect fuel pressure gauge valve. Short pin 30

No 13

Yes 12 10 Use special connector to supply 12 V voltages

No Next

Yes N ex t 11 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 12 Replace fuel. Check If fuel deteriorates or

containing water.

No 18

Yes N ex t 13 Check if fuel pressure below 250kPa.

No 17

Yes N ex t 14 Shut off fuel gauge valve. Connect ignition key

again to run fuel pump for 3 seconds. Check if

No 16
fuel pressure can be set up.

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Chery QQ Maintenance Manual 465 EFI System

15 Open fuel gauge valve, use return fuel blocker

to clamp fuel pipe for no returning fuel. Check if
fuel pressure can be set up soon.

Yes Replace fuel pressure

regulator

No Repair and replace

injector or fuel pipe

16 Check if fuel pipe is leaked or blocked.

Yes Repair or replace fuel

pipe

No Replace fuel pump

17 Check returning fuel pipe is blocked or bend.

Yes Repair or replace

returning fuel pipe

No Replace fuel pressure

regulator

Yes Cleaning 18 Check if sensor holes on MAP and IAT block.

No Next

Yes N ex t 19 Run engine at idle. After coolant temperature
reaches actuating temperature for closed loop
control, check if oxygen sensor works normally.

Chec if intake air system leaks.

20

No Check oxygen sensor

and harness

Yes Eliminate leak

No Next

Yes N ex t 21 Check if cylinder pressure is normal.

No Trouble shooting

Yes Replace ECU 22 Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check
if ignition advance angle is 6.75 　crank angle.

No Adjust ignition

advance angle

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Chery QQ Maintenance Manual 465 EFI System

7） Unstable idle at heat engine

1 Turn on ignition key. Use diagnostic equipment

to check if malfunction information record exists.

3 Check if MAP pressure is 35—65 kPa at idle

in heating engine process.

adaptor between ECU and harness. Check if
voltages on pin 44,45 ( output signal for IAT and
ECT)and pin 12 ( for 4.5-5V power of sensor) are
normal.

engine and check if engine speed is normal

reaches normal, groun pin 51 on ECU and check
if ignition advance angle is 6.75 　crank angle.

8）Unstable idel after heat engine

1 Turn on ignition key.Use diagnostic equipment

to check if malfunction information record exists

ECU and harness. Check if voltages on pin
7,44,45, 28(output signal for MAP, IAT,ECT and
oxygen sensor)and pin 4,21,26,29(output to idle
actuator)are normal

and pin 87 of fuel pump relay to start fuel pump.
Check if fuel pressure is 250—300 kPa.

Yes Eliminate ecplicit

malfunction

No Next

Yes N ex t 2 Check if air filter is through.

No Replace

Yes N ex t

No Eliminate intake

system malfunction

Yes N ex t 4 Shut off engine ,turn on ignition key. Connect

No Check

Yes N ex t 5 Pull out idle actuator connector before heat start

No Replace idle actuator

Yes N ex t 6 Check if coolant temperatuer sensor is normal

No Replace

Yes Replace ECU 7 Run engine at idle. After coolant temperature

No Adjust

ignitionadvance angle

Yes Eliminate

malfunction

No Next

Yes N ex t 2 Turn on ignition key. Connect adaptor between

No Repair or replace

harness

Yes N ex t 3 Shout off engine .Check if air filter is through

No Replace

Yes N ex t 4 Check if MAP pressure is 35—65 kPa at idle

No Eliminate intake

system leak

Yes N ex t 5 Connect fuel pressure gauge valve. Short pin 30

No 9

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Chery QQ Maintenance Manual 465 EFI System

Yes 8 6 Use special connector to supply 12 V voltages
from battery to injector and check if injector

No Next

works normally.

Yes Replace 7 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 8 Check if fuel is deterirate or containing water

No 14

Yes N ex t 9 Check if fuel pressure blowe 250kpa

No 13

Yes N ex t 10 Shut off fuel gauge valve. Connect ignition key
again to run fuel pump for 3 seconds. Check if

No 12

fuel pressure can be set up.

11 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if
fuel pressure can be set up soon.

Yes Replace fuel pressure

regulator

No Repair and replace

injector or fuel pipe

12 Check if fuel inlet is leak or block

Yes Repair or replace fuel

inlet

No Replace fuel pump

13 Check if return fuel pipe is block or bend

Yes Repair or replace

return fuel pipe

No Replace fuel pressure

regulator

Yes N ex t 14 Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check
if ignition advance angle is 6.75 　crank angle.

15 Pull out coolant temperature sensor and check if

engine is normal

No Adjust ignition

advance angle

Yes Replace coolant

temperature sensor

No Next

Yes N ex t 16 Check if cylinder compression pressure of engine
is normal

No Trouble shooting

Yes N ex t 17 Check if the resistance of high voltage wire is
normal (about 16k/ m. For exact data, please

No Replace

touch manufacture).。

Yes Replace 18 Check if any ablation damage or crack on
distributor cover and distributor

No Next

Yes Replace ECU 19 Check if spark plug is normal

No Replace spark plug

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Chery QQ Maintenance Manual 465 EFI System

9）Unstable idel or switch off on load condition(with A/C etc,.)

1 Turn on ignition key.Use diagnostic equipment

to check if malfunction information record exists

Yes Eliminate

malfunction

No Next

Yes N ex t 2 Turn on A/C switch. Turn on ignition key.
Connect adaptor between ECU and harness.

No Repair A/C circuit

Check if pin 40 and 41(A/C switch) have signal
input

Yes N ex t 3 Check if A/C system pressure, magnetic clutch of
compressor and A/C pump are normal

No Repair or replace

Yes N ex t 4 Turn on ignition key. Check if voltage on pin 4,
21, 26, 29 (output to idle actuator) are normal

5 Remove stepmotor and check if stepmotor is

jamming or does not work flexibly

No Check control circuit

Yes Repair or replace

stepmotor

No Next

Yes Replace ECU 6 Turn engine and open A/C. Check if idle actuator
is normal

No Replace idle actuator

ECU can take not only the low-level signal but also high-level signal of its No.41 pin as
requesting signal. No.41 pin should be high-level signal if ECU takes low-level signal of its
No.41 pin as requesting signal, under the condition of A/C switch off. Otherwise it is true.

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Chery QQ Maintenance Manual 465 EFI System

10）Preiodically unstable(ECU needs self-studay again)

1 Turn on ignition key. Use diagnostic equipment to

check if malfunction information record exists

Yes

No Next

Yes N ex t 2 Check if air filter is through。

No Replace

Yes N ex t 3 Check if intake pressure is 35—65 kPa at idle

No Repair

Yes 7 4 Run engine at idle. Shut off each cylinder one by

one and check if engine speed is dropping or

No Next

fluctuates.

Yes N ex t 5 Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin 7,44,45,
28( output signal for MAP,IAT,ECT and oxygen
sensor),19(ground),27(ignition switch)and pin 4,
21,26, 29 (output to idle actuator)are normal

No Rpair or replace

harness

Yes N ex t 6 Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check if
ignition advance angle is 6.75 　crank angle.

No Adjust ignition

advance angle

Yes cleaning 7 Check if sensor holes on MAP and IAT block.

battery to injector and check if injector works
normally.

normal

distributor cover and distributor

11）Idle is too high (ECU needs self –studay again)

No Next

Yes Replace fuel 8 Check if fuel is deterirate or containing water

No Next

Yes N ex t 9 Use special connector to supply 12 V voltages from

No Repair harness

and injector

Yes N ex t 10 Check if the resistance of high voltage wire is

No Replace

Yes Replace 11 Check if any ablation damage or crack on

No Next

Yes Replace ECU 12 Check if spark plug is normal

No Replace spark

plug

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Chery QQ Maintenance Manual 465 EFI System

1 Turn on ignition key.Use diagnostic equipment to

check if malfunction information record exists。

Yes Eliminate

malfunction

No Next

Yes Adjust or replace2 Check if throttle pedal bracing wire is blocked or
too tight

No Next

Yes Repair or replace3 Check if canistor control valve, fuel pressure
regulator, PVC vacuum pipe and vacuum

No Next

power-assisted hose of braking system are good

Yes N ex t 4 Step down brake pedal and check if idle is too high
while engine idle running and in neutral.

5 Clamp vacuum power-assisted hose and check if

idle is normal

No 6

Yes Repair or replace

vacuum actuator

No Next

Yes Replace PVC 6 Clamp PVC vacuum hose and check if idle is
normal

7 Clamp canistor control valve hose and check if idle

is normal

No Next

Yes Replace canistor

control valve

No Next

12）Speed of engine is low or switch off while speeding up

1 Turn on ignition key.Use diagnostic equipment to

check if malfunction information record exists。

reaches normal, groun pin 51 on ECU and check if
ignition advance angle is 6.75 　crank angle.

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Yes Repair or replace8 Check if idle actuator is not flexibly or blocked

No Next

Yes Repair or replace9 Check if intake pipe have leak

No Next

Yes N ex t 10 Check if sealing washer of injector is good

No Replace sealing

washer

Yes Replace ECU 11 Check if MAP and IAT are good

No Replace sensor

Yes Eliminate

malfunction

No Next

Yes N ex t 2 Check if air filter is through

No Replace

Yes N ex t 3 Check if speed is narmal at idle

No Next

Yes N ex t 4 Check if intake pressure is 35—65 kPa at idle

No Repair

Yes N ex t 5 Run engine at idle. After coolant temperature

No Adjust ignition

advance angle

Chery QQ Maintenance Manual 465 EFI System

Yes N ex t 6 Connect fuel pessure gauge valve. Short pin 30 on
fuel pump relay and pin 87 to start fuel pump.

No 10

Check if fuel pressure is 250—300 kPa

Yes 9 7 Use special connector to supply 12 V voltages from
battery to injector and check if injector works

No Next

normally.

Yes N ex t 8 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 9 Check if fuel is deterirate or containing water
。

No 15

Yes N ex t 10 Check if fuel pressure below 250kPa.

No 14

Yes N ex t 11 Shut off fuel gauge valve. Connect ignition key
again to run fuel pump for 3 seconds. Check if fuel

No 13

pressure can be set up.

12 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if fuel
pressure can be set up soon。

Yes Replace fuel

pressure regulator

No Replace and

repair injector or
fuel pipe

13

Check if fuel pipe is leaked or blocked.

Yes Repair or replace

fule pipe

No Replace fuel

pump

14

Check returning fuel pipe is blocked or bend.

Yes Repair or replace

returning fuel
pipe

No Replace fuel

pressure regulator

Yes N ex t 15 Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin
53(output signal for TPS), pin 30 (ground
connection) and pin 12(for 4.5-5V power of sensor)
are normal.

No Repair or replace

harness

Yes Replace ECU 16 Check if ignition coil, distrbutor, high voltage wire
and spark plug are normal

No Repair or replace

relate unit

13）Speeding up is slow

1 Turn on ignition key.Use diagnostic equipment to

check if malfunction information record exists

Yes Eliminate

malfunction

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Chery QQ Maintenance Manual 465 EFI System

No Next

Yes N ex t 2 Shout off engine. Check if air filter is through

No Replace

Yes N ex t 3 Check if speed is narmal at idle

No Reference trouble

shooting of idle
system

Yes N ex t 4 Check if intake pressure is 35—65 kPa at idle

No Repair

Yes N ex t 5 Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin
53(output signal for TPS), pin 30 (ground

No Repair or replace

connection) and pin 12( for 4.5-5V power of
sensor) are normal.

Yes N ex t 6 Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check if
ignition advance angle is 6.75 　crank angle.

No Adjust ignition

advance angle

Yes N ex t 7 Connect fuel pessure gauge valve. Short pin 30 on
fuel pump relay and pin 87 to start fuel pump.

No 11

Check if fuel pressure is 250—300 kPa

Yes 10 8 Use special connector to supply 12 V voltages from
battery to injector and check if injector works

No Next

normally.

Yes N ex t 9 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 10 Check if fuel is deterirate or containing water

No 16

Yes N ex t 11 Check if fuel pressure below 250kPa.

No 15

Yes N ex t 12 Shut off fuel gauge valve. Connect ignition key
again to run fuel pump for 3 seconds. Check if fuel

No 14

pressure can be set up.

13 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if fuel
pressure can be set up soon

Yes Replace pressure

regulator

No Repair and

replace injector or
fuel pipe

14

Check if fuel pipe is leaked or blocked.

Yes Repair or replace

fuel pipe

No Replace fuel

pump

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Chery QQ Maintenance Manual 465 EFI System

15

Check returning fuel pipe is blocked or bend.

Yes Repair or replace

fuel pipe

No Replace pressure

regulator

16 Check if exhaust system and TWC is blocked

Yes Replace or

cleaning

No Replace ECU

14）Poor performance of acceteration and powerlessness

1 Check if it exists malfunction as following: clutch

slipping, air pressure of tire is low, braking drag,

Yes R ep ai r

No Next

size of tire and four-wheeled alignment are
miscorrect

Yes N ex t 2 Check if throttle can full-open

No Rpair or replace

throttle

3 Turn on ignition key.Use diagnostic equipment to

check if malfunction information record exists。

Yes Eliminate

malfunction

No Next

Yes N ex t 4 Run engine at idle. After coolant temperature
reaches normal, groun pin 51 on ECU and check if
ignition advance angle is 6.75 　crank angle.

No Adjust ignition

advance angle

Yes N ex t 5 Turn on ignition key. Connect adaptor between
ECU and harness. Check if voltages on pin 7,53,44,
45, 28 (output signal for MAP, TPS, IAT, ECT and
oxygen sensor), 28,30(signal ground connection for
sensor) and pin 12 (for 4.5-5V power of sensor) are
normal

No Repair or replace

harness

Yes N ex t 6 Check if intake pressure is 35—65 kPa at idle after
start

No Repair

Yes N ex t 7 Connect fuel pessure gauge valve. Short pin 30 on
fuel pump relay and pin 87 to start fuel pump.

No 11

Check if fuel pressure is 250—300 kPa

Yes 10 8 Use special connector to supply 12 V voltages from
battery to injector and check if injector works

No Next

normally.

Yes N ex t 9 Re-check if injector can inject fuel after cleaning.

No Replace injector

Yes Replace fuel 10 Check if fuel is deterirate or containing water

No 16

Yes N ex t 11 Check if fuel pressure below 250kPa.

No 15

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Chery QQ Maintenance Manual 465 EFI System

Yes N ex t 12 Shut off fuel gauge valve. Connect ignition key
again to run fuel pump for 3 seconds. Check if fuel

No 14

pressure can be set up.

13 Open fuel gauge valve, use return fuel blocker to

clamp fuel pipe for no returning fuel. Check if fuel
pressure can be set up soon。

Yes Replace pressure

regulator

No Repair and replace

injector or fuel pipe

14

Check if fuel pipe is leaked or blocked.

15

Check returning fuel pipe is blocked or bend

Yes Repair or replace

fuel inlet

No Replace fuel pump

Yes Repair or replace

returning fuel pipe

No Replace pressure

regulator

Yes N ex t 16 Check if the date of MAP or IAT is normal。

No Replace sensor

Yes N ex t 17 Check if ignition coil, distributor, high voltage wire
and spark plug are normal

No Replace or adjust

Yes Check A/C system 18 Check if A/C system is malfunction.

No Replace ECU

15）A/C system malfunction

Yes N ex t 1 Check if there is full coolant and check if A/C belt,
A/C clutch, pressure switch are narmal

No Eliminate

malfunction

2 Turn on A/C switch at engine idle. Check if A/C

thermistor is malfunction

Yes Eliminate

malfunction

No Next

Yes N ex t 3 Turn on A/C switch. Connect adaptor between
ECU and harness. Check if output signal for ECU
pin 40 and 41(A/C switch)

4 If the vehicle is low-level controlled, Check if A/C

can work when turn off A/C.

No Check harness

Yes Replace bulb or

repair harness

No Next

5 Check if output low-level is on ECU pin

22(connect earthing terminal of A/C relay pull-in
coil)

8. Precaution for service

1) Precaution for service EFI
(1) Controler removal request

Chery Automobile Co., Ltd

Yes Repair A/C relay

and harness

No Replace ECU

54

Chery QQ Maintenance Manual 465 EFI System

Remove controller before welding or painting;
Turn off ignition switch when removing controller to void gamage;
Don’t remove power wires from battery when engine running or electric appliance is in
using;
Don’t start engine with high current;
Note that the ambient temperature of controller could not exceed 80Cº
(2) Clean request: Please observe following regulations:
Put removed parts on clean place and cover them with suitable cloth.
Only allowed to pull out ot insert each harness or tester harness after ignition switch turns
off.
Make sure the correction for connecting wires when measuring voltage or ground for
electronic control system;
Removing power wires from battery or pulling out controller connector will cause losing
the information for diagnosis and self-study stored in memory.
(3) Precaution for fuel system service
When removing or installing fuel pump in fully or partial fully fuel tank, pay close
attention to:
Mounting equipment that could absorb leaked fuel on tank outlet before operation;
Avoid skin touch with fuel directly;
Cover or block out the opened parts if not be used at once;
Take out parts only before installing. Don’t use the parts witout pakage;
Don’t damage o-ring during installing injector. Smear a little lubricant on o-ring for
beteer fitting;
Don’t use compressed air or move vehicle when opening system.

2) Safety precaution

In order to avoid personal hurt or damage injector and ignition unit, pay close attentionto:

(1) Don’t touch otr pull out ignition harness if engine is running or starting;
(2) Pull bout harness connector if engine is started by starter motor (for example in the

situation of checking compressed air).

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