Chery QQ6 (S21) / S12LHD. Manual — part 108

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.