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