Chery Fora (Elara A520). Manual — part 154

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

55

3. It is hard to start the heating car.

General failure component: 1) water inside of fuel; 2) fuel pump; 3) coolant
temperature sensor; 4) fuel pressure regulator vacuum pipe; 5) ignition coil.

General diagnostic flow

No.

Operating steps

Result

Follow up

steps

Yes

Next step

1

Connect the fuel pressure meter ( connecting point is the

front end of fuel distributing pipe assembly fuel intake

pipe); starting 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

2

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 if

there is blue and white high pressure fire.

No

Repair the

ignition

system

Yes

Repair circuit

or replace

sensor

3

Take off the coolant temperature sensor joint and start

the engine; observe if the engine can be started

successfully. (or serial connecting a 300Ωresistance at

the joint of coolant temperature sensor; observe if we

can start the engine)

No

Next step

Yes

Repair or

replace

4

Check if there if loosen or leaking of the fuel pressure

regulator vacuum pipe..

No

Next step

Yes

Change fuel

5

Check fuel conditions and check if the failure is

appeared after the fuel refilling

No

Diagnosis

help

Yes

Diagnosis

help

6

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.

Check

correspond

circuit

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

56

4. It’s hard to start the cold car.

General failure component: 1), water in the fuel; 2), fuel pump; 3), coolant temperature
sensor; 4), injector; 5), ignition coil; 6), throttle valve and idle speed by pass port; 7),
engine mechanical part.

General diagnosis flow:

No.

Operating steps

Result

Follow up steps

Yes

Next step

1

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

2

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 if

there is blue and white high pressure fire.

No

Check and repair

ignition system

Yes

Repair circuit or

replace sensor

3

Take off the coolant temperature sensor joint and start the

engine; observe if the engine can be started successfully.

(or serial connecting a 2500Ωresistance at the joint of

coolant temperature sensor; observe if we can start the

engine)

No

Next step

Yes

Clean throttle

valve and idle

speed air port

4

Step on the accelerator slightly and observe if it is easy to

be started

No

Next step

Yes

Replace the part

5

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

Change fuel

6

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No

Next step

Yes

Trouble shoot

7

Check pressure conditions of every cylinder and observe

if there is insufficient pressure

No

Next step

Yes

Diagnosis help

8

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

Check correspond

circuit

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

57

5. Normal engine speed but hard to start at any time.

General failure component: 1), water in fuel; 2), fuel pump; 3), coolant temperature
sensor; 4), injector; 5), ignition coil; 6), throttle valve and idle speed by pass port; 7), air
intake port; 8), ignition timing; 9), spark plug; 10), engine mechanical part.

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; check the air

intake port if it is leaking.

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

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 if

there is blue and white high pressure fire.

No

Check and repair

ignition system

Yes

Next step

4

Check spark plugs in every cylinder and observe its

type and clearance if it is accord with the regulation.

No

Adjust or replace

Yes

Repair circuit or

replace sensor

5

Take off the coolant temperature sensor joint and start

the engine; observe if the engine can be started

successfully.

No

Next step

Yes

Clean throttle

valve and idle

speed air port

6

Step on the accelerator slightly and observe if it is

easy to be started easily.

No

Next step

Yes

Replace the part

7

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

Change fuel

8

Check fuel conditions and check if the failure is

appeared after the fuel refilling

No

Next step

Yes

Trouble shoot

9

Check pressure conditions of every cylinder and

observe if there is insufficient pressure

No

Next step

Yes

Next step

10

Check the engine ignition order and ignition timing if

it is accord with the regulation.

No

Repair the

ignition timing

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

58

6. Regular starts but the idle speed is not steady at any time.

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

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; check the air intake

port if it is leaking.

No

Next step

Yes

Clean or

replace

2

Check idle speed regulator if it is partial blocked

No

Next step

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

Cleaning

4

Check the throttle valve and idle speed by pass if there is

carbon deposition.

No

Next step

Yes

Replace part

5

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

Change fuel

6

Check fuel conditions and check if the failure is appeared

after the fuel refilling

No

Next step

Yes

Trouble shoot

7

Check pressure conditions of every cylinder and observe if

there is big pressure difference between the cylinders.

No

Next step

Yes

Next step

8

Check the engine ignition order and ignition timing if it is

accord with the regulation.

No

Repair the

ignition timing

Yes

Diagnosis help

9

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 the

corresponding

line