Chery A15. Instruction - page 40

Diagnostic trouble code: P0500 “Malfunction of improper speed signal”

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

Check and service

the ABS system.

2

For the vehicles equipped with ABS
system, verify that there is a diagnostic
trouble code designed for ABS system.

No

Proceed to next

step.

Yes

Proceed to next

step.

3

Verify that the indicating needle of
speedometer works properly.

No

Check and service

the instrument

circuit.

Yes

Proceed to next

step.

4

Verify that the speed sensor works
properly.

No

Replace the speed

sensor.

Yes

Repair or replace

the wiring harness.

5

Verify that the circuit between the signal
cable of speed sensor and 59# pin of ECU
is open, or is short to power supply or to
ground.

No

Refer to diagnosis

help.


G-48

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

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