Chery QQ6 (UMC EFI for 473F Engine). Service Instruction — part 3

77

P0694

Too high voltage in relay control circuit of electronic cooling fan (high

speed)

class5

78

P0704

Improper clutch pedal signal

class5

79

P1336

Restrictive effect of safety monitoring torque of electronic throttle

class34

80

P1545

The deviation between physical location and target location of electronic

throttle overruns

class34

81

P1558

Too large opening resistance of electronic throttle

class34

82

P1559

Failure in self-study process of electronic throttle

class34

83

P1564

System voltage fails to meet the conditions for self-study of electronic

throttle

class34

84

P1565

Failure in self-study of initialization of lower limit position of electronic

throttle

class34

85

P1568

Too large restoration resistance of electronic throttle

class34

86

P1579

Fails to meet the conditions for self-study of electronic throttle

class34

87

P1604

Failure in self-study of gain adjustment of electronic throttle

class34

88

P1610

Unprogrammed error in Secret Key and Security Code

class39

89

P1611

Security Code acceptance error

class39

90

P1612

Challenge request failed

class36

91

P1613

Immo Code request failed

class36

92

P1614

Transponder check error

class36

93

P1677

Too high voltage in control circuit of detector lamp (SVS)

class5

94

P1678

Too low voltage in control circuit of detector lamp (SVS)

class5

95

P1679

Failure in control circuit of detector lamp (SVS)

class5

96

P2106

Failure in driver stage of electronic throttle

class34

97

P2122

Too low voltage in signal circuit of electronic accelerator pedal position

sensor 1

class34

98

P2123

Too high voltage in signal circuit of electronic accelerator pedal position

sensor 1

class34

99

P2127

Too low voltage in signal circuit of electronic accelerator pedal position

sensor 2

class34

100

P2128

Too high voltage in signal circuit of electronic accelerator pedal position

sensor 2

class34

101

P2138

Improper signal from electronic accelerator pedal position sensor

class34

102

P2177

Self-study value of closed loop air fuel ratio control is above the upper limit

(normal load zone)

class5

103

P2178

Self-study value of closed loop air fuel ratio control is below the lower limit

(normal load zone)

class5

104

P2187

Self-study value of closed loop air fuel ratio control is above the upper limit

(idle speed zone)

class5

105

P2188

Self-study value of closed loop air fuel ratio control is below the lower limit

(idle speed zone)

class5

106

P2191

Self-study value of closed loop air fuel ratio control is above the upper limit

(heavy load zone)

class5

107

P2192

Self-study value of closed loop air fuel ratio control is below the lower limit

(heavy load zone)

class5

Electrical Schematic Diagram of Diagnostic Interface

Main power cord

Engine
theft-proof
module 1

11. The Steps for Implementation of Failure Diagnosis According to

Failure Information Records

11.1 Electronic Throttle Failure

Failure codes: P012, P0122, P0123, P022, P0222, P0223, P1336, P154, P1558, P1559, P1564,

P1565, P1568, P1579, P1604

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull out the joint of throttle position sensor on

harness; use a multimeter to check if the

magnitude of voltage between its 3# and 5# pins

is around 12V and if a 5V voltage is present

between 6# and 2# pins.

No

5

Yes

Next step

3

Use a multimeter to check if the resistance

values between 1#, 4# and 6# pins of the sensor

are between 0.5kΩ and 1.6kΩ.

No

Replace the sensor

Yes

Replace the sensor

4

Meanwhile, use a multimeter to check if it is

break or short circuit between 1#, 4# and 6#

pins of throttle position sensor and ECU38#,

54#, 36#; or, turn blade of the throttle to observe

if its resistance value jumps and if the resistance

values between 1#, 4# and 6# change

accordingly with rotation of throttle.

No

Replace ECU

Yes

Repair or replace

wire harness

5

Connect an adaptor between ECU and harness,

use a multimeter respectively check if it is break

or short circuit between 1#, 2#, 6# and 4# pins

of the sensor and 10#, 32#, 36# and 54# pins of

ECU joint.

No

Replace ECU

Note: This auto adopts the electronic throttle body and has cancelled former step motor,
and the functions that were accomplished by the stop motor on a common throttle body
are now completely accomplished by the throttle driving motor. The electronic throttle
can not be repaired and failure rate of the throttle body is very low, if damaged,
replacing the assembly is the only choice to deal with the problem.

Special attention: The electronic throttle body can not be disassembled and repaired at
service station; in addition, after replacing electronic throttle body, be sure to let it carry
out self-study; otherwise, unsteady working at idle speed of engine may occur. See also
the section about electronic throttle for detailed study scheme. Maintenance of the
throttle body is analogous to that of the common valve body.

11.2 Knock Sensor failure

Failure codes: P0324, P0327, P0328

No.

Operating steps

Result

Follow up steps

1

Close the ignition switch, and the engine stops.

Next step

Yes

Next step

2

Pull out the joint of knock sensor on harness, use a

multimeter to check if both resistance values

between 1# and 2# pins and between 1# pin and

shielded wire (sensor shield) pin of knock sensor

are more than 1MΩ.

No

Replace with a new

sensor

Yes

Next step

3

Knock on the edge of knock sensor with a small

hammer and check with multimeter if there is

communicating signal output between sensor pin

1# and 2#.

No

Replace the sensor

4

Turn on the ignition switch but do not start the

engine.

Next step

Yes

Repair or replace

wires

5

Connect an adaptor between ECU and harness, use

a multimeter respectively check if it is break or

short circuit between 19#, 20# pins of ECU and

1#, 2# pins of sensor joint.

No

Replace ECU

Note: Generally, knock sensor is not liable to damage. When disassembling and installing the knock

sensor, be careful not to leave dirt on the contact surface of the sensor and the engine body and do

not add any gasket. If the sensor is damaged, it will have an comparatively great effect on

economical efficiency and emission of the engine. After the knock sensor is damaged, the electric

control system of the engine will lock ignition advance angle of the engine at a fixed ignition angle,

so, the acceleration performance of the engine will fall and economical efficiency and emission of

the engine will also be greatly affected.

11.3 Air Pressure Sensor Failure

Failure codes: P0102, P0103, P0112, P0113

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

4

2

Pull out joint of intake air pressure sensor on

harness; use a multimeter to check if a 5V

voltage is present between 2# and 3# pins of the

joint.

No

Next step

Yes

Repair or replace

harness

3

Between ECU and harness, use a multimeter to

respectively check if it is break or short circuit

between 42# and 33# pins of ECU and 1#, 2#,

3#, 4# pins of sensor joint.

No

Next step

4

Replace the intake air temperature pressure

sensor.

Next step

Note: In case the sensor shorts to 5V or 12V power supply or ground, the engine may not start up or

stop running.

11.4 Front Oxygen Sensor Failure

Failure codes: P0130, P0131, P0132, P0134, P0135

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull off the connector of harness of oxygen sensor.

Check the voltage between pin 1# (+) and 2# (-)

with multimeter and detect if it is around 12V.

No

4

Yes

Replace ECU

3

Use a multimeter to check if the resistance value

between 1# and 2# pins of the oxygen sensor is

between 2Ω and 5Ω at 23

.

℃

No

Replace the sensor

Yes

Next step

4

Check if heating circuit of the oxygen sensor is

normal.

No

Check the circuit

Yes

Repair or replace

harness

5

Check if it is short circuit or break circuit between

the pin 2# of oxygen sensor and main relay 87#

pin and between the sensor connector 1# pin and

ECU 1# pin with multimeter.

No

Next step

6

Connect the oxygen sensor connector of harness

and use neutral. Start the engine and leave it at

idle speed until its coolant temperature reaches to

the normal value.

Next step

Yes

Next step

7

Pull off the oxygen sensor connector of harness.

Check the battery output voltage between pin 3#

(+) and pin 4# (-) of the sensor with multimeter

and detect if it is from 0.1 to 0.9V (after the

engine warms up).

No

Replace the sensor

Yes

Repair or replace

harness

8

Connect the adaptor between ECU and harness.

Check if it is short circuit or break circuit between

the pin 36# and pin 13# of ECU and the sensor

connector pin 3# and pin 4# respectively with

multimeter.

No

Replace ECU

9

Plug in the oxygen sensor connector of harness

and use neutral. Start the engine and leave it at

idle speed until its coolant temperature reaches to

the normal value.

Next step

Yes

Next step

10

Connect special diagnostic tester for Chery to read

part of data stream of the engine, and then observe

if part of data stream of the sensor fluctuates

between 100mv and 900mv.

No

Replace the sensor

11

Start the engine and let it run at idle speed until

coolant temperature reaches normal value.

Next step

Yes

Check other part

12

Connect special diagnostic tester for Chery to read

part of data stream of the engine, and then

carefully observe part of data stream of the sensor;

apply the accelerator pedal to bottom and then

rapidly release it, observe if the output voltage of

the oxygen sensor can reach below 100mv.

No

Replace the sensor

Note: when checking data flow of the oxygen sensor, be sure to note working position
of the engine and let the working temperature of the engine reach the normal value,
because the oxygen sensor only can start to work normally when the temperature is over
300

.

℃

11.5 Rear Oxygen Sensor Failure

Failure codes: P0136, 0137, 0138, 0036, 0037, 0038, 0054

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull off the oxygen sensor connector of harness.

Check the voltage between pin 1# (+) and 2# (-)

with multimeter and detect if it is around 12V.

No

4

Yes

Replace ECU

3

Use a multimeter to check if the resistance value

between 1# and 2# pins of the oxygen sensor is

between 2Ω and 5Ω at 23

.

℃

No

Replace the sensor

Yes

Next step

4

Check if heating circuit of the oxygen sensor is

normal.

No

Check the circuit

Yes

Repair or replace

harness

5

Check if it is short circuit or break circuit between

pin 2# of oxygen sensor and main relay 87# pin

and between the sensor connector 1# pin and ECU

1# pin with multimeter.

No

Next step

6

Connect the oxygen sensor connector of harness

and use neutral. Start the engine and leave it at

idle speed until its coolant temperature reaches to

the normal value.

Next step

Next step

7

Validate if the three-way catalytic converter works

normally.

Yes

No

Replace the

three-way catalytic

converter

Yes

Next step

8

Pull out the oxygen sensor joint on harness.

Rapidly apply the accelerator pedal for several

times, and then use a multimeter to check if a

output voltage between 0.1V and 0.9V is present

between 3# (+) and 4# (-) pins of the sensor (after

the engine warms up).

No

Replace the sensor

Yes

Repair or replace

harness

9

Connect the adaptor between ECU and harness.

Check if it is short circuit or break circuit between

the pin 36# and pin 55# of ECU and the sensor

connector 3# and 4# pins respectively with

multimeter.

No

Replace ECU

10

Connect the oxygen sensor connector of harness

and use neutral. Start the engine and leave it at

idle speed until its coolant temperature reaches to

the normal value.

Next step

11

Connect special diagnostic tester for Chery to read

Yes

Next step

part of data stream of the engine, and then observe

if part of data stream of the oxygen sensor is

around 100 under standard idling operation.

No

Replace the sensor

or the three-way

catalytic converter

12

Start the engine and let it run at idle speed until

coolant temperature reaches normal value.

Next step

Yes

Check other part

13

Connect special diagnostic tester for Chery to read

part of data stream of the engine, and then

carefully observe part of data stream of the sensor;

rapidly apply the accelerator pedal for several

times and observe if the output voltage of the

oxygen sensor fluctuates within a comparatively

large scope.

No

Replace the sensor

Note: The characteristics and operating principle of rear oxygen sensor is basically the
same as those of front oxygen sensor, in special conditions, they can be interchanged to
use. The only difference between them is their different installation sites (working
atmospheres), therefore, during maintenance and diagnostic processes of the vehicle,
please pay attention to some inspection techniques for front and rear oxygen sensors.

11.6. Coolant Temperature Sensor Failure

Failure codes: P0112, P0113

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull out joint of coolant temperature sensor on

harness; use a multimeter to check if the

magnitude of voltage between 1# (+) and 2# (-)

pins of this joint is around 5V.

No

4

Yes

Replace ECU

3

Use a multimeter to check if the resistance value

between 1# and 2# pins of the sensor is in

proportion to its temperature (refer to relevant part

in this service manual).

No

Replace the sensor

Yes

Repair or replace

harness

4

Use a multimeter to check if it is break or short

circuit between 17# and 29# pins of ECU and 2#

and 1# pins of sensor joint.

No

Replace ECU

Yes

Next step

5

Start the engine, while engine coolant temperature

rises, check if the voltages on two wires of the

sensor falls as water temperature of the engine

rises.

No

Replace the sensor

Yes

Check other part

6

Start the engine, disconnect the connector of water

temperature sensor, and then observe if cooling

fan of the engine starts up and runs at high speed.

No

Replace the ECU or

the circuit

11.7 Failure in Driver Stage of Injector

Failure codes: P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270,

P0271

No.

Operating steps

Result

Follow up steps

1

Close the ignition switch, and the engine stops.

Next step

2

Pull out each electromagnetic injector joint on

harness in turn, and then lap the two pins of

multimeter between 2# pin of the joint and the

engine.

Next step

Yes

Repeat 2

All yes

6

3

Put the ignition switch to “ON”. Observe if, at the

instant when the ignition switch cuts in, the

multimeter displays an around 12V voltage value

of battery (mainly check if the injector has power

supply, which is provided by main relay).

No

Next step

Yes

Repair or replace

harness

4

Use a multimeter to check in turn if it is break or

short circuit between 87# pin of output terminal of

main relay of the engine and 1# pin of each

electromagnetic injector joint.

No

Next step

5

Repair or replace fuel pump relay and main relay

and their circuits.

Yes

Repair or replace

harness

6

Connect the adaptor between ECU and harness;

use a multimeter to check in turn if it is break or

short circuit between 27#, 7#, 47# or 6# pins of

ECU and 2# pin of each corresponding

electromagnetic injector joint on harness.

No

Next step

Yes

Repeat 7

All yes

Next step

7

Use a multimeter to check in turn if a resistance

between 12Ω and 16Ω is present at 20

between

℃

1# and 2# pins (and resistance value of injector) of

the electromagnetic injectors.

No

Replace the

electromagnetic

injector

Yes

Repeat 8

8

Re-plug all electromagnetic injector joints, engage

the gear to neutral position, start the engine, and

then let it run at idle speed. Pull out all

electromagnetic injector joints on harness in turn.

Whenever a joint is pulled out, observe if engine

vibration is aggravated accordingly (equivalent to

spark out experiment).

No

Replace ECU

Note: The damage probability of injector is very low; its main failure is carbon deposit
in injection nozzle, which may result in atomization of fuel injection, poor spray and
unsteady idle speed of engine; therefore, when inspecting, above failure should be
inspected as an emphasis.

11.8 Failure in Driver Stage of Canister Control Valve

Failure codes: P0443, 0444, 0445

No.

Operating steps

Result

Follow up steps

1

Start the engine and let it run at idle speed until

engine coolant temperature reaches normal value.

Next step

Yes

Next step

2

Pull out canister control valve joint on harness;

use a multimeter to check if an around 8.6V

battery voltage is present between two pins of this

joint.

No

5 (check positive

wire)

Yes

Next step

3

Re-plug the canister control valve joint on harness,

increase engine revolution to 2000rpm, and then

touch the valve body by hand to check if the

canister control valve has slight vibration and

impact (frequency control).

No

7 (check ground

wire)

Yes

Replace ECU

4

Use a multimeter to check if the resistance value

between A# and B# pins of the canister control

valve is around 25Ω (20

).

℃

No

Replace the canister

control valve

Yes

Repair or replace

the harness

5

Check if it is short circuit or break circuit between

the pin of main relay 87# and the pin of canister

control valve 1# with multimeter.

No

Next step

6

Repair or replace the main relay and the circuit.

Yes

Repair or replace

harness

7

Cut off the engine; connect the adaptor between

ECU and harness, and use a multimeter to check if

it is break or short circuit between 46# pin of ECU

and A# pin of the canister control valve.

No

Replace ECU

8

With ignition switch ON, disconnect canister

control valve joint, and then use a multimeter to

check the A# and B# pins at harness end of

solenoid valve.

Next step

Yes

Next step

9

Use a multimeter to check if an around 12V

battery voltage is present between B# pin and

ground wire.

No

Check feed circuit

Yes

Check other part

10

Use a multimeter to check if an around 3.6V

battery voltage is present between A# pin and

ground wire.

No

Check ECU circuit

or replace the ECU

Note: The carbon canister solenoid valve is used for the emission control system, a
system set up for environmental protection and air pollution prevention. When engine
runs at idle speed or under heavy load operating mode, the solenoid valve will not
participate in the work. A malfunction of this solenoid valve will result in unsteady
operating mode of the engine. These details should be noted during maintenance
process.

11.9 Failure in Driver Stage of Malfunction Indicator Lamp (MIL)

Failure codes: P1677, P1678, P1679

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”

Next step

Yes

Check the circuit

2

Disassemble the dashboard, and then use a

multimeter to check if it is break or short circuit

between 29#, 30# pins at instrument end and 62#,

81# pins of ECU.

No

Next step

Yes

Next step

3

Replace the instrument and then check if it is

normal

No

Replace the

instrument

Yes

Replace ECU

4

Replace ECU, and then re-check if it works

normally.

No

Check other part

Yes

Replace the harness

5

Check CAN circuit for the place where is

grounding or short.

No

Check other part

Note: The malfunction indicator lamp is controlled by ECU. When a failure occurs in
the system, ECU will control the malfunction indicator lamp to light. There are two
kinds of malfunction indicator lamps on this auto (engine failure indicator lamp and
EPC), but the engine failure indicator lamp on the instrument may be shielded in the
system, that is, when a failure occurs, EPC lamp will light, which should be noted
during maintenance process.

11.10 Failure in Driver Stage of 1#, 2# Coils of Step Motor

Failure codes: P1682, 1683

No.

Operating steps

Result

Follow up steps

1

Turn on the ignition switch but do not start the

engine.

Next step

Yes

Next step

2

Pull out connector of the electronic throttle, and

then check if the resistance value between 5# and

3# pins of the connector is around 6.1Ω.

No

Replace the

electronic throttle

body

Yes

Next step

3

Pull out the connector, and then use a multimeter

to check if a 12V alternate voltage is present

between 5# and 3# connectors of the electronic

throttle.

No

Check the circuit

Yes

Replace the idle

speed actuator

4

Use a multimeter to check if a 12V voltage is

present between the connector of the harness and

ground when the key is ON.

No

Next step

Yes

Repair or replace

the harness

5

Between ECU and harness, use a multimeter

respectively to check if it is break or short circuit

between 67#, 65# pins of ECU and 5# pin of the

connector and between 66#, 64# pins of ECU and

3# pin of the connector.

No

Replace ECU

Note: Much about failure diagnosis for other parts has been involved above.

11.11 Crankshaft Position Sensor Failure

Failure code: P0016

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Next step

2

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if the voltage

between 1# pin of this joint and ground wire is

around 12V (battery voltage).

No

Check circuit and

main power supply

Yes

Next step

3

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if the voltage

between 2# pin of this joint and ground wire is

around 11.5V (power supply from ECU and the

voltage is below the battery voltage).

No

Check circuit and

ECU

Yes

Repair or replace

the harness

4

Use a multimeter to check if it is break or short

circuit between 79# pin of ECU and 2# pin of

sensor joint.

No

Next step

Yes

Next step

5

Pull out camshaft position sensor joint on harness,

and then use a multimeter to check if it is

conducting between 3# pin of this joint and

ground wire.

No

Replace the sensor

6

Connect the sensor connector and start the engine.

Next step

Yes

Check other part

7

Use a oscillometer to check if an around 6V

square wave signal output is present in 2# signal

cable.

No

Replace the sensor

Note: The camshaft position sensor is an auxiliary sensor and has great effect on emission of the system.

When failure occurs in this sensor, the vehicle will be difficult to start; though the vehicle will be

basically normal after startup, driving restrictive practice will be found on the engine and the maximum

revolution of engine can not exceed 4000rpm.

11.12 Craftshaft Position Sensor Failure

Failure codes: P0321, P0322, P0219

No.

Operating steps

Result

Follow up steps

1

Put the ignition switch to “ON”.

Next step

Yes

Check the circuit

2

Pull out crankshaft position sensor joint on

harness, use a multimeter to check if it is short or

break circuit between 1# pin of this joint and 34#

pin of ECU.

No

Next step

Yes

Next step

3

Pull out crankshaft position sensor joint on

harness, use a multimeter to check if it is short or

break circuit between 3# pin of this joint and 15#

pin of ECU.

No

Check circuit and

ECU

Yes

Repair or replace

the harness

4

Use a multimeter to check if it is break or short

circuit between 79# pin of ECU and 2# pin of

sensor joint.

No

Next step

Yes

Next step

5

Pull out crankshaft position sensor joint on

harness, and then use a multimeter to check if the

two signal cables on the sensor has a resistance

value of around 1000Ω.

No

Replace the sensor

6

Connect the sensor connector and start the engine.

Next step

Yes

Check other part

6

Use an oscillometer to check if signal waveform

output is present in signal cable.

No

Replace the sensor

Note: Crankshaft position sensor is the main sensor of electronic control unit of engine. If crankshaft

position sensor failure occurs, the engine will be difficult to start; acceleration performance of the engine

will be greatly restricted after startup; the maximum revolution of the engine can not exceed 3800rpm;

meanwhile, emission of the engine will deteriorate.