Chery Fora (Elara A520). Manual — part 156

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

63

11. Low engine speed or dying out exists when it is accelerated.

General failure component: 1) water in fuel; 2) air intake pressure sensor and throttle
position sensor; 3) spark plug; 4) throttle valve and idle speed by pass port; 5) air intake
port; 6) idle speed regulator; 7) injector; 8) ignition timing; 9) exhaust pipe.

General diagnosis flow:

No.

Operating steps

Result

Follow up steps

Yes

Repair the air
intake system

1

Check the air cleaner if it is jammed.

No

Next step

Yes

Next step

2

Connect the fuel pressure meter ( connecting point is the

front end of fuel distributing pipe assembly fuel intake

pipe); start the engine and check fuel pressure at idle speed

if it is around 260kpa; take off the vacuum pipe from fuel

pressure regulator check the fuel pressure if it is around

300kpa.

No

Repair the fuel

supplying

system

Yes

Next step

3

Check spark plugs in every cylinder and observe its type

and clearance if it is accord with the regulation.

No

Adjust or

replace

Yes

Clean related

part

4

Disassemble idle speed regulator and check throttle valve,

idle speed regulator and idle speed by pass port if there is

carbon deposition.

No

Next step

Yes

Next step

5

Inspect air intake pressure sensor, throttle position sensor

and its line if it is working correctly.

No

Repair line or

replace sensor

Yes

Replace fault

part

6

Disassemble the injector, check the injector using the

injector special cleaning analysis meter and observe if it is

leaking or jammed.

No

Next step

Yes

Replace fuel

7

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No

Next step

Yes

Next step

8

Check the engine ignition order and ignition timing if it is

accord with the regulation.

No

Repair ignition

timing

Yes

Next step

9

Check the exhaust pipe if the air exhausting is smooth

No

Repair or

replace exhaust

pipe

Yes

Diagnosis help

10

Connect EFI system adaptor, turn on the ignition switch;

check the power supply of pin No.12, 13, 44, 45 and No.63

if it is in right conditions; check pin armature of No.3, 51,

53, 61 and No.80 if it is in right conditions.

No

Repair

corresponding

line

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

64

12. React slowly when it is accelerated.

General failure component: 1) water in fuel; 2) air intake pressure sensor and throttle
position sensor; 3) spark plug; 4) throttle valve and idle speed by pass port; 5) air intake
port; 6) idle speed regulator; 7) injector; 8) ignition timing; 9) exhaust pipe.

General diagnosis flow:

No.

Operating steps

Result Follow up steps

Yes

Repair the air
intake system

1

Check the air cleaner if it is jammed.

No

Next step

Yes

Next step

2

Connect the fuel pressure meter ( connecting point is the

front end of fuel distributing pipe assembly fuel intake

pipe); start the engine and check fuel pressure at idle speed

if it is around 260kpa; take off the vacuum pipe from fuel

pressure regulator check the fuel pressure if it is around

300kpa.

No

Repair the fuel

supplying

system

Yes

Next step

3

Check spark plugs in every cylinder and observe its type

and clearance if it is accord with the regulation.

No

Adjust or

replace

Yes

Clean related

part

4

Disassemble idle speed regulator and check throttle valve,

idle speed regulator and idle speed by pass port if there is

carbon deposition.

No

Next step

Yes

Next step

5

Inspect air intake pressure sensor, throttle position sensor

and its line if it is working correctly.

No

Repair line or

replace sensor

Yes

Replace fault

part

6

Disassemble the injector, check the injector using the

injector special cleaning analysis meter and observe if it is

leaking or jammed.

No

Next step

Yes

Replace fuel

7

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No

Next step

Yes

Next step

8

Check the engine ignition order and ignition timing if it is

accord with the regulation.

No

Repair ignition

timing

Yes

Next step

9

Check the exhaust pipe if the air exhausting is smooth

No

Repair or

replace exhaust

pipe

Yes

Diagnosis help

10

Connect EFI system adaptor, turn on the ignition switch;

check the power supply of pin No.12, 13, 44, 45 and No.63

if it is in right conditions; check pin armature of No.3, 51,

53, 61 and No.80 if it is in right conditions.

No

Repair

corresponding

line

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

65

13. The performance is poor when it is accelerated.

General failure component:1) water in fuel; 2) air intake pressure sensor and throttle
position sensor; 3) spark plug; 4) ignition coil; 5) throttle valve and idle speed by pass
port; 6) air intake port;7) idle speed regulator; 8) injector; 9) ignition timing; 10)
exhaust pipe.

General diagnosis flow:

No.

Operating steps

Result

Follow up

steps

Yes

Repair

1

Check if there are failures like clutch skidding, low tyre

pressure, brake dragging, wrong tyre size, and wrong four

wheel positioning etc..

Next step

Yes

Repair the air
intake system

2

Check the air cleaner if it is jammed.

No

Next step

Yes

Next step

3

Connect the fuel pressure meter ( connecting point is the

front end of fuel distributing pipe assembly fuel intake

pipe); start the engine and check fuel pressure at idle speed

if it is around 260kpa; take off the vacuum pipe from fuel

pressure regulator check the fuel pressure if it is around

300kpa.

No

Repair the

fuel supplying

system

Yes

Next step

4

Pull off one of the cylinder separating line and connect

spark plug to it; keep the spark electrode around 5mm away

from engine body; start the engine and check the high

pressure fire strength if it is regular.

No

Repair

ignition

system

Yes

Next step

5

Check spark plugs in every cylinder and observe its type and

clearance if it is accord with the regulation.

No

Adjust or

replace

Yes

Clean related

part

6

Disassemble idle speed regulator and check throttle valve,

idle speed regulator and idle speed by pass port if there is

carbon deposition.

No

Next step

Yes

Next step

7

Inspect air intake pressure sensor, throttle position sensor

and its line if it is working correctly.

No

Repair line or

replace sensor

Yes

Replace fault

part

8

Disassemble the injector, check the injector using the

injector special cleaning analysis meter and observe if it is

leaking or jammed.

No

Next step

Yes

Replace fuel

9

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No

Next step

Yes

Next step

10

Check the engine ignition order and ignition timing if it is

accord with the regulation.

No

Repair

ignition

timing

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

66

Yes

Next step

11

Check the exhaust pipe if the air exhausting is smooth

No

Repair or

replace

exhaust pipe

Yes

Diagnosis

help

12

Connect EFI system adaptor, turn on the ignition switch;

check the power supply of pin No.12, 13, 44, 45 and No.63

if it is in right conditions; check pin armature of No.3, 51,

53, 61 and No.80 if it is in right conditions.

No

Repair

corresponding

line