Chery A series. Manual - part 42

 

Diagnostic trouble code: P0601 “Malfunction of non-programmed check code in 
electronic control unit” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

1 

Connect the diagnostic tester and adaptor 
and turn the ignition switch to “ON” 
position. 

 

Proceed to next 

step 

Yes 

Proceed to next 

step 

2 

Clear the diagnostic trouble code and 
reconfirm that this malfunction is a steady 
state malfunction. 

No Normal 

operation 

3 Replace 

ECU. 

End 

 
 

 

 

 

 

Diagnostic trouble code: P0602 “Malfunction of non-programmed diagnostic 
trouble code in electronic control unit” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

1 

Connect the diagnostic tester and adaptor 
and turn the ignition switch to “ON” 
position. 

 

Proceed to next 

step 

Yes 

Proceed to next 

step 

2 

Clear the diagnostic trouble code and 
reconfirm that this malfunction is a steady 
state malfunction. 

No Normal 

operation

3 Replace 

ECU. 

End 

 

 

 

 

 

 

 

 

 

G-57

 

Diagnostic trouble code: P0645 “Malfunction in control circuit of A/C 
compressor relay” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

1 

Connect the diagnostic tester and adaptor 
and turn the ignition switch to “OFF” 
position. 

 

Proceed to next 

step 

Yes 

Proceed to step 4

2 

Pull out the A/C compressor relay, turn the 
ignition switch to “ON” position and check 
if the voltage between the power supply 
terminal of relay (i.e. 30# and 85# pins of 
the relay) and the negative grid of power 
supply is about 12V. 

No 

Proceed to next 

step 

Yes 

Repair or replace 

the wiring 

harness. 

3 

Check if the power supply circuit of relay is 
open or short to ground. 

No 

Proceed to Step 2

Yes 

Replace the relay.

4 

Inspect with multimeter to check if the 
voltage between the control terminal of A/C 
compressor relay (i.e. 86# pin of the relay) 
and the negative grid of power supply is 
about 3.7V. 

No 

Proceed to next 

step 

Yes 

Repair or replace 

the wiring 

harness. 

5 

Check if the circuit between the control 
terminal of A/C compressor relay (i.e. 86# 
pin of the relay) and 70# pin of ECU is 
open. 

No 

Refer to 

diagnosis help. 

 
 

 

 

 

 

 

 

 

 

 

 

G-58

 

Diagnostic trouble code: P0646 “Undervoltage in control circuit of A/C 
compressor relay” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

1 

Connect the diagnostic tester and adaptor 
and turn the ignition switch to “OFF” 
position. 

 

Proceed to next step

Yes 

Proceed to Step 4 

2 

Pull out the A/C compressor relay, turn 
the ignition switch to “ON” position and 
check if the voltage between the power 
supply terminal of relay (i.e. 30# and 85# 
pins of the relay) and the negative grid of 
power supply is about 12V. 

No 

Proceed to next step

Yes 

Repair or replace 

the wiring harness.

3 

Check if the power supply circuit of relay 
is open or short to ground. 

No 

Proceed to Step 2 

Yes 

Replace the relay. 

4 

Inspect with multimeter to check if the 
voltage between the control terminal of 
A/C compressor relay (i.e. 86# pin of the 
relay) and the negative grid of power 
supply is about 3.7V. 

No 

Proceed to next step

Yes 

Repair or replace 

the wiring harness.

5 

Check if the circuit between the control 
terminal of A/C compressor relay (i.e. 86# 
pin of the relay) and 70# pin of ECU is 
short to ground. 

No 

Refer to diagnosis 

help. 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

G-59

 

Diagnostic trouble code: P0647 “Overvoltage in control circuit of A/C 
compressor relay” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

1 

Connect the diagnostic tester and adaptor 
and turn the ignition switch to “OFF” 
position. 

 

Proceed to next step

Yes 

Proceed to Step 4 

2 

Pull out the A/C relay, turn the ignition 
switch to “ON” position and check if the 
voltage between the power supply 
terminal of relay (i.e. 30# and 85# pins of 
the relay) and the negative grid of power 
supply is about 12V. 

No 

Proceed to next 

step. 

Yes 

Repair or replace 

the wiring harness 

3 

Check if the power supply circuit of relay 
is open or short to ground. 

No 

Proceed to Step 2 

Yes 

Replace the relay 

4 

Inspect with multimeter to check if the 
voltage between the control terminal of 
A/C compressor relay (i.e. 86# pin of the 
relay) and the negative grid of power 
supply is about 3.7V. 

No 

Proceed to next step

Yes 

Repair or replace 

the wiring harness 

5 

Check if the circuit between the control 
terminal of A/C compressor relay (i.e. 
86# pin of the relay) and 70# pin of ECU 
is short to supply. 

No 

Refer to diagnosis 

help 

 

 

G-60