Chery S11 / Chery QQ. Manual — part 208

Chery QQ Maintenance Manual 372 EFI System

DTC 18 IAT

进气压力温度传感器

Diagram of MAP and IAT

No. Operation

steps

Test

results

Next step

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
multimeter.

No Next

Yes

Repair or replace

harness

3

Connect the adaptor between ECU and
harness, check if open or short between
pin 48, pin 46, pin 60 of ECU and pin 1,
pin 3, pin 4 separately with multimeter.

No Next

4

Turn on ignition key but engine not run

Next

Yes Replace

ECU

5

Put on N shaft and run engine in idle. Step
down accelarate pedal to fully open.
Check if the voltage between pin 4 and
pin 1 of sensor is incrasing to 4V with
multimeter.

No

Replace ECU or

sensor

Chery QQ Maintenance Manual 372 EFI System

Oxygen sensor

主继电器

氧传感器

The diagram of oxygen sensor

No. Operation

steps Test

result

Next step

1

Turn on ignition key.

Next

Yes Next

2

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

No 4

Yes Replace

ECU

3

Check if the resistance between pin 1 and pin 2 on
oxygen sensor is from 6 to 25.

No Replace

sensor

Yes Replace

fuse

4

Check if the fuse in oxygen sensor heating circuit
is burn out.

No Next

Yes

Repair or replace

harness

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.

No Next

6

Insert the connector of oxygen sensor harness. Put
N shaft and run engine in idle to normal coolant
temperature.

Next

Yes Next

7

Put out the connectors of oxygen sensor from
harness. Check if output 0.1-0.9V voltage between
pin 4（+） and pin 3（-）

Yes Repalce

sensor

Yes

Repair or replace

harness

8

Connect the adaptor between ECU and harness.
Check if open or short between pin 43, pin 59 on
ECU and pin 3, pin 4 separately

No

更换

Replace

ECU

Oxygen sensor

Chery QQ Maintenance Manual 372 EFI System

DTC 18 IAT

进气压力温度传感器

The diagram of MAP and IAT

No. Operation

Steps

Test

result

Next step

1

Turn on ignition key.

Next

Yes Next

2

Put out the connectors on MAP and IAT

harness.Check if the voltage between pin 1

and pin 2 is 5 V.

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).

No Replace sensor

Yes

Repair or replace

harness

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.

No Replace

ECU

Coolant temperature sensor

Chery QQ Maintenance Manual 372 EFI System

接仪表

b

The diagram of CTS

No. Operation

steps

Test

result

Next step

1

Turn on ignition key.

Next

Yes Next

2

Put out the connector on CTS harness,

check if the voltage between pin and pin c is

5V.

No 4

Yes Replace

ECU

3

Check if the resistance between pin a and

pin c is suit to the temperature ( see related

parts in this manual).

No Replace

sensor

Yes

Repair or replace

harness

4

Connect the adaptor between ECU and

harness. Check if open or short between pin

73, pin 31 on ECU and pin a, pin c

separately.

No Replace

ECU

Injector