Chery A series. Manual - part 40

 

Diagnostic trouble code: P0506 “Idle speed lower than nominal idle speed” 

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 next 

step. 

2 

Verify that the adjusting screw of throttle, 
accelerator pedal stay and working 
condition of throttle are in good condition.

No 

Carry out 

necessary 

Overhaul. 

Yes 

Proceed to next 

step. 

3 

Verify that the working condition of idle 
speed regulator is correct. 

No 

Carry out 

necessary 

Overhaul. 

Yes 

Carry out 

necessary 

Overhaul. 

4 

A. Verify that there is under pressure in the 
fuel supplying system; 
B. Verify that there is blockage in the fuel 
injector; 
C. Verify that there is blockage in the 
exhaust system. 

No 

Refer to diagnosis 

help. 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-49

 

Diagnostic trouble code: P0507 “Idle speed higher than nominal idle speed” 

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 next 

step. 

2 

Verify that the adjusting screw of throttle, 
accelerator pedal stay and working 
condition of throttle are in good condition. 

No 

Carry out 

necessary 

Overhaul. 

Yes 

Proceed to next 

step. 

3 

Verify that the working condition of idle 
speed regulator is correct. 

No 

Carry out 

necessary 

Overhaul. 

Yes 

Carry out 

necessary 

Overhaul. 

4 

A.  Verify that there is air leakage in the 
system; 
B. Verify that there is leakage in the fuel 
injector; 
C. Verify that there is over pressure in the 
fuel supplying system. 

No 

Refer to diagnosis 

help. 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-50

 

Diagnostic trouble code: P0508 “Undervoltage in control circuit of idle speed 
regulator” 

Item 

No. 

Operation procedure 

Inspection 

results 

Follow-up 

procedure 

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

 

1 

Proceed to next 

step 

Yes 

Proceed to next 

step 

2 

Disconnect the connector of idle speed 
regulator and inspect with multimeter to 
verify that the resistances between pin A 
and D, pin B and C are 53±5.3Ω under 
20 .

℃

 

No 

Replace the step 

motor. 

Yes 

Repair or replace 

the wiring harness.

3 

Verify that the circuits between pin A, B, 
C, and D of idle speed regulator and 65#, 
66#, 67#, and 64# pin of ECU are short to 
ground. 

No 

Refer to diagnosis 

help. 

 

G-51

 

Diagnostic trouble code: P0509 “Overvoltage in control circuit of idle speed 
regulator” 

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 

Disconnect the connector of idle speed 
regulator and inspect with multimeter to 
verify that the resistances between pin A 
and D, pin B and C are 53±5.3Ω under 
20 .

℃

 

No 

Replace the step 

motor. 

Yes 

Repair or replace the 

wiring harness. 

3 

Verify that the circuits between pin A, B, 
C, and D of idle speed regulator and 65#, 
66#, 67#, and 64# pin of ECU are short 
to power supply. 

No 

Refer to diagnosis 

help. 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G-52