Chery A11. Manual - part 182

 

Maintenance Manual for Chery · Windcloud      

M7.9.7 EFI System

 

Failure code: P0646 too low control circuit voltage of air conditioner 

compressor relay 

Step Operation 

Result  Solution 

1 

Connect scanner and commutator, and then turn 
ignition switch to “OFF”. 

 

Go to next step

Yes 

Go to Step 4 

2 

Unplug air conditioner compressor relay, turn 
ignition switch to “ON”, check voltages between 
Pin 30, 85 of relay (power supply terminals of 
relay) and cathode of power supply to see if they are 
around 12V. 

No 

Go to next step

Yes 

Repair or 
replace wire 
harness 

3 

Check power supply terminal circuit of relay to see 
if open circuit or short circuit to ground occurs. 

No 

Go to Step 2 

Yes Replace 

relay 

4 

Check the voltage between Pin 86 of relay (control 
terminal of air conditioner compressor relay) and 
cathode of power supply to see if it is around 3.7V. 

No 

Go to next step

Yes 

Repair or 
replace wire 
harness 

5 

Check the connection between Pin 86 of relay 
(control terminal of air conditioner compressor 
relay) and Pin 70 of ECU to see if short circuit to 
ground occurs. 

No 

Diagnosis 
Instruction 

 

Failure code: P0647 too high control circuit voltage of air conditioner 

compressor relay 

Step Operation 

Result  Solution 

1 

Connect scanner and commutator, and then turn 
ignition switch to “OFF”. 

 

Go to next step

Yes 

Go to Step 4 

2 

Unplug air conditioner compressor relay, turn 
ignition switch to “ON”, check voltages between 
Pin 30, 85 of relay and cathode of power supply to 
see if they are around 12V. 

No 

Go to next step

Yes 

Repair or 
replace wire 
harness 

3 

Check power supply terminal circuit of relay to see 
if open circuit or short circuit to ground occurs. 

No 

Go to Step 2 

Yes Replace 

relay 

4 

Check the voltage between Pin 86 of relay (control 
terminal of air conditioner compressor relay) and 
cathode of power supply to see if it is around 3.7V. 

No 

Go to next step

 

36

 

Maintenance Manual for Chery · Windcloud      

M7.9.7 EFI System

 

Step Operation 

Result  Solution 

Yes 

Repair or 
replace wire 
harness 

5 

Check the connection between Pin 86 of relay 
(control terminal of air conditioner compressor 
relay) and Pin 70 of ECU to see if short circuit 
occurs. 

No 

Diagnosis 
Instruction 

 

Failure code: P1651 control circuit error of fault indicating lamp 

Step Operation 

Result  Solution 

1 

Connect scanner and commutator, and then turn 
ignition switch to “ON”. 

 

Go to next step

Yes 

Go to next step

2 

Test operation of engine fault indicating lamp using 
“Actuator Operation Test” function of scanner, 
observe if it keeps off or on. 

No System 

normal

Yes 

Repair or 
replace wire 
harness 

3 

Check fault indicating lamp power supply terminal 
circuit of engine to see if open circuit or short 
circuit to ground occurs. 

No 

Go to next step

Yes 

Repair or 
replace wire 
harness 

4 

Check the connection between the pin at control 
terminal of engine fault indicating lamp and Pin 29 
of ECU to see if open, short circuit to power/ground 
occurs. 

No 

Diagnosis 
Instruction 

 

 

37

 

Maintenance Manual for Chery · Windcloud      

M7.9.7 EFI System

 

6. Diagnostic Steps for Various Engine Failures 

Preliminary inspection shall be carried out before proceeding with diagnostic steps for 
any engine failure: 
(1). Make sure ECU and fault indicating lamp are working normally (models without fault 

indicating lamp directly go to next step). 

(2). Check with scanner or flash lamp to make sure that there is no failure information 

recorded. 

(3). Check warming-up idling data of ECU with scanner to make sure that each value is 

within normal range. 

(4). Confirm the existence of failure complained by vehicle owner and locate the specific 
failure. 
Then appearance inspection: 
 Check ground point of wire harness to see if it is clean and firm. 
 Check vacuum pipe to see if it is properly connected, or if it is broken or twisted. 
 Check pipelines to see if blockage occurs. 
 Check intake pipe to see if it is squashed or damaged. 
 Check the sealing surface between throttle body and intake manifold to see if it is in good 

condition. 

 Check high voltage wire of ignition system to see if it is properly laid out with no breakage 

or aging. 

 Check connections to see if they are properly made; check contacts to see if they are loosed 

or poorly connected. 

 
 
 
 

 

38

 

Maintenance Manual for Chery · Windcloud      

M7.9.7 EFI System

 

1). Engine dose not rotate or rotates slowly when starting

 

 

Step Operation 

Result 

Solution 

Yes 

Go to next step 

1 

Check the voltage between two terminals of 
accumulator with a multimeter to see if it is around 
10-12.5V. 

No 

Repair or replace 
accumulator 

Yes 

Go to next step 

2 

Turn ignition switch to “ON”. Check the voltage on 
terminal of ignition switch connected to anode of 
accumulator with a multimeter to see if it is around 
10-12.5V. 

No 

Repair terminal 
or change wire 

Yes 

Go to next step 

3 

Keep iginition switch at “ON”, check the voltage on 
terminal to ignition switch connected to starting 
motor push-pull coil with a multimeter to see if it is 
higher than 8V. 

No 

Repair or replace 
ignition switch 

Yes 

Repair or replace 
starting motor 

4 

Check starting motor with a multimeter to see if open 
or short circuit occurs. 

No 

Go to next step 

Yes 

Eliminate failure 

5 

Check engine to see if it is stuck due to poor 
lubrication. 

No 

Go to next step 

Yes 

Replace lubricant 
or oil with proper 
models 

6 

In case of cold weather, check engine lubricant and 
gearbox oil to see if they cause excessive resistance to 
starting motor. 

No 

Check other parts

 
 
 
 

 

39