Chery QQ6 (S21) / S12LHD. Manual — part 107

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