Chery Tiggo T11 LHD. Manual — part 63

Chery T11 Service Manual Electric Injection System

65

2) The engine can operate manually but it is difficult to start up successfully

during the engine starts

No.

Operation Step

Detection

Result

Subsequent

Step

1

Place the ignition switch on the “ON” position, and apply the

failure diagnosis instrument to examine and confirm whether

there are some failure information records.

Yes

Remove the

displayed

failures

No

Next step

2

Pull out the subcylinder line, and connect up the sparkle plug to

make the sparkle plug’s electrode be 5 to 10 mm away from the

engine body, then apply the starter motor to enable the engine to

operate and examine and confirm whether there is blue-white

high-voltage fire.

Yes

8

No

Next step

3

Examine the resistance valve of high-voltage wire (no less than

4K ohm)

Yes

Next step

No

Repair

or

replace high

voltage wire

4

Examine the damage of the subcylinder high-voltage wire and

sparkle plug

Yes

Replace

No

Next step

5

Examine the damage of crankshaft position sensor

Yes

Replace

No

Next step

6

Examine the normal operation of the ignition coil

Yes

Next step

No

Replace

7

Examine the connection condition of intake pressure sensor

connecting parts (MT 20U is with the intake pressure cylinder

detection technology)

Yes

Next step

No

Connect the

male

contact

8

Place the ignition switch on the “ON’ position, and examine and

confirm whether the fuel pump relay and fuel pump can operate.

Yes

Next step

No

Repair the

fuel pump

circuit

9

Connect the fuel pressure gage valve, short circuit the No 30 pin

and No 70 pin of the fuel pump relay to enable the fuel pump to

operate, and examine and confirm whether the fuel pressure is

approximate 350 kPa.

Yes

Next step

No

13

10

Pull out the fuel distributing pipe together with the fuel injector,

and pull out the fuel injector connector on the harness one by

one, directly supply 12V voltage to fuel injector from the battery,

and examine and confirm whether the fuel injector is available to

inject fuel.

Yes

12

No

Next step

11

Rinse the fuel injector, and, after that, reexamine and confirm

whether the fuel injector is available to inject fuel.

Yes

Next step

No

Replace

fuel injector

Chery T11 Service Manual Electric Injection System

66

12

Examine and confirm whether the fuel deteriorates or contains

water

Yes

Replace

fuel

No

18

13

Examine and confirm whether the fuel pressure is below 350

kPa.

Yes

Next step

No

17

14

Shut off the fuel gage valve, turn on the ignition switch again to

enable the fuel pump to operate again, and examine and confirm

whether the fuel pressure can be established.

Yes

Next step

No

16

15

Turn on the fuel gage valve, apply the fuel return immobiliser to

clip the fuel return pipe tightly so as to make it hasn’t fuel return,

and examine and confirm whether it is able to establish the fuel

pressure quickly (fuel pump aging, operating capacity decrease

not exclusive)

Yes

Replace

fuel

pressure

regulator

No

Repair or

replace fuel

injector or

fuel pipe

16

Examine the leakage or jamming of the fuel intake pipe.

Yes

Repair or

replace the

fuel intake

pipe

No

Replace

fuel pump

17

Examine the jamming or bending of the fuel return pipe

Yes

Repair or

replace the

fuel return

pipe

No

Replace the

fuel

pressure

regulator

18

Connect up an adaptor between ECU and harness, examine the

voltage of No 1, 17 and 18 pins of ECU, and examine and

confirm whether the positive power wire connecting with ECU

pins above and the earth wire connecting with No 37 pin of ECU

are normal.

Yes

Next step

No

Repair or

replace

harness

19

Examine the air leakage of the intake system components.

Yes

Repair

No

Next step

20

Examine and confirm whether the intake manifold absolute

pressure and temperature sensor is jammed.

Yes

Repair or

replace

No

Next step

21

Examine and confirm whether the coolant temperature sensor is

normal.

Yes

Next step

No

Repair or

replace

Chery T11 Service Manual Electric Injection System

67

22

Examine and confirm whether the unsuccessful startup is caused

due to the mechanical reasons such as too big clearance between

the piston and cylinder, cylinder leakage and etc.

Yes

Remove the

mechanical

fault

No

Replace

ECU

The fuel injector control coil must be disconnected during this experiment is conducted so as

to avoid that the excessive fuel enter into the three-way catalytic converter, which may burn

down the three-way catalytic converter after the engine starts smoothly.

3) Warm start difficult

No.

Operation Step

Detection

Result

Subsequent

Step

1

Place the ignition switch on the “ON” position, and apply the

failure diagnosis instrument to examine and confirm whether

there are some failure information records.

Yes

Remove the

displayed

failure

No

Next step

2

Connect the fuel pressure gage valve, short circuit the No 30 pin

and No 87 pin of the fuel pump relay to enable the fuel pump to

operate, and examine and confirm whether the fuel pressure is

approximate 350 kPa.

Yes

Next step

No

9

3

Disconnect the connecting fuel pipe, turn off the ignition switch,

and, after 1 hour, view whether the pressure of fuel system is still

between 250 kPa and 300 kPa (otherwise, there is leakage

inside the system).

Yes

Next step

No

Repair the

fuel system

leakage

4

Connect the connecting pipe, and apply the fuel return

immobiliser to block the fuel return pipe, at the same time, turn

off the fuel pressure gage valve and ignition switch, and, after 1

hour, view whether the pressure of fuel system is still between

250 kPa and 300 kPa.

Yes

Replace

fuel

pressure

regulator

No

Next step

5

Examine the fuel leakage of the fuel injector and fuel pipe.

Yes

Replace

fuel injector

and fuel

pipe

No

Next step

6

Pull out the connector of water temperature sensor to enable the

engine to start, and view whether it can be able to start

successfully.

Yes

Examine

the coolant

temperature

and circuit

No

Next step

Chery T11 Service Manual Electric Injection System

68

7

Connect up an adaptor between ECU and harness, examine the

voltage of No 1, 17 and 18 pins of ECU, and examine and

confirm whether the positive power wire connecting with ECU

pins above and the earth wire connecting with No 37 pin of ECU

are normal.

Yes

Next step

No

Repair

or

replace

harness

8

Replace fuel, conduct the warm start again, and view whether it

can be able to start successfully.

Yes

End

No

Replace

ECU

9

Examine the jamming or bending of the fuel return pipe, and the

normal operation of fuel pump regulator.

Yes

Next step

No

Repair or

replace

10

Apply a multimeter to detect the battery voltage of both ends of

fuel pump connecting parts.

Yes

Next step

No

Repair or

replace the

fuel pump

relay and

conducting

wire

11

Apply a multimeter to detect the proper resistance value of fuel

pump..

Yes

Next step

No

Replace

fuel pump

12

Examine and confirm whether the fuel pump is clipped tightly.

Yes

Replace

fuel pump

No

Replace

ECU

4) Normal engine speed, while it always starts difficultly

No.

Operation Step

Detection

Result

Subsequent

Step

1

Place the ignition switch on the “ON” position, and apply the

failure diagnosis instrument to examine and confirm whether

there are some failure information records.

Yes

Remove

the

displayed

failure

No

Next step

2

Examine and confirm whether the air cleaner is unobstructed.

Yes

Next step

No

Replace

3

After the success startup, detect and confirm whether the pressure

of intake manifold during idle is between 35 kPa and 55 kPa.

Yes

Next step

No

Remove the

intake system

leakage

failure