Chery Tiggo T11 LHD. Manual — part 64

Chery T11 Service Manual Electric Injection System

69

4

Step on the throttle slightly, and view whether it is easy to start.

Yes

Replace and

examine the

throttle and

idle channel

5

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

6

Apply the special connecting terminal to directly supply the fuel

injector 12 V voltage from the battery, and examine the normal

operation of fuel injector.

Yes

8

No

Next step

7

Rinse the fuel injector, and then reexamine the normal operation

of fuel injector.

Yes

Next step

No

Replace the

fuel injector

8

Replace fuel, and examine and confirm whether the fuel

deteriorates or contains water.

Yes

Replace fuel

No

14

9

Examine and confirm whether the fuel pressure is less than 350

kPa.

Yes

Next step

No

13

10

Turn 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

Replace the

fuel pressure

regulator

No

Repair/replace

fuel injector

or fuel pipe

11

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.

Yes

Replace the

fuel pressure

regulator

No

Repair or

replace the

fuel injector

or fuel pipe

12

Examine the leakage or jamming of the fuel intake pipe.

Yes

Repair or

replace the

fuel intake

pipe

No

Replace the

fuel pump

13

Examine the jamming or bending of the fuel return pipe

Yes

Repair or

replace fuel

return pipe

No

Replace the

fuel pressure

regulator

14

Pull out the idle actuator connector on the harness before the

Yes

Next step

Chery T11 Service Manual Electric Injection System

70

engine coolant temperature reaches 35℃, and view whether the

engine speed decreases (the engine enters the Fault Mode).

No

Repair or

replace the

idle actuator

15

Place the ignition switch on the “ON” position. Examine and

confirm whether the voltages of the following ECU pins are

normal: for No 1, 17 and 18 pins, its voltage is approx. 12V

battery voltage; and for No 73 pin, 0V.

Yes

Next step

No

Examine

harness and

connecting

parts

16

Enable the engine to conduct idle operation, and examine and

confirm whether the ignition advance angle is normal after the

coolant temperature reaches the normal value..

Yes

Next step

No

Search the

others

17

Examine and confirm whether the cylinder compression pressure

of engine is normal.

Yes

Next step

No

Remove the

failure

18

Examine and confirm whether the intake manifold absolute

pressure and temperature sensor is jammed.

Yes

Repair or

replace

No

Next step

19

Examine and confirm whether the coolant temperature sensor is

normal.

Yes

Replace ECU

No

Repair or

replace

Chery T11 Service Manual Electric Injection System

71

5) Cold 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

Apply a multimeter to detect whether the coolant

temperature sensor is normal. (It is also available to

serially connect a 1.5K ohm resistance between the No

43 and 05 pins of ECU, which is used to substitute the

coolant temperature sensor to start a engine. If start is

available, it indicates that the coolant temperature is off

normal.)

Yes

Next step

No

Replace sensor

3

Turn on the ignition switch. Connect an adaptor between

the ECU and harness, and examine and confirm whether

the voltages of the following pins are normal: for No 17

and 18 pins, its voltage is approx. 12V battery voltage;

and for No 73 pin, 0V.

Yes

Next step

No

Examine harness

and connecting parts

4

Examine and confirm whether the air cleaner is

unobstructed.

Yes

Next step

No

Replace

5

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

6

Step on the throttle slightly, and view whether it is easy

to start.

.

Yes

Examine the throttle

and idle channel

No

Next step

7

Pull out the idle actuator connector on the harness before

the engine coolant temperature reaches 35℃, and view

whether the engine speed decreases (the engine enters

the Fault Mode).

Yes

Next step

No

Repair or replace the

idle actuator

8

Connect the fuel pressure gage valve (the connecting

point changes as the vehicle model). Directly earth the

No 86 pin of fuel pump relay. Turn on the ignition switch

to enable the fuel pump relay and fuel pump to operate.

Examine and confirm whether the fuel pressure is less

than 350 kPa.

Yes

Next step

No

12

9

Apply the special connecting terminal to directly supply

the fuel injector 12 V voltage from the battery, and

examine the normal operation of fuel injector.

Yes

11

No

Next step

10

Rinse the fuel injector, and then reexamine the normal

Yes

Next step

Chery T11 Service Manual Electric Injection System

72

operation of fuel injector.

No

Repair/replace fuel

injector

11

Examine and confirm whether the fuel deteriorates or

contains water.

Yes

Replace fuel

No

17

12

Examine and confirm whether the fuel pressure is less

than 350 kPa.

Yes

Next step

No

16

13

Turn 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

15

14

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.

Yes

Replace the fuel

pressure regulator

No

Repair or replace the

fuel injector or fuel

pipe

15

Examine the leakage or jamming of the fuel intake pipe.

Yes

Repair or replace the

fuel intake pipe

No

Replace the fuel

pump

16

Examine the jamming or bending of the fuel return pipe

Yes

Repair or replace the

fuel return pipe

No

Replace the fuel

pressure regulator

17

Examine and confirm whether the cylinder pressure of

engine is normal.

Yes

Next step

No

Remove the failure

18

Examine the leakage of engine intake system.

Yes

Repair

No

Next step

19

Examine and confirm whether the intake manifold

absolute pressure and temperature sensor is jammed.

Yes

Repair or replace

No

Replace ECU