Chery Tiggo T11 LHD. Manual — part 66

Chery T11 Service Manual Electric Injection System

77

pressure quickly.

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 the

fuel return

pipe

No

Replace the

fuel pressure

regulator

14

Enable the engine to operate at idle speed, and, after the coolant

temperature reaches the normal value, examine and confirm

whether the ignition advance angle is normal.

Yes

Nest step

No

Adjust the

ignition

advance angle

15

Pull out the coolant temperature sensor, and view whether the

engine operates normally.

Yes

Replace the

coolant

temperature

sensor

No

Next step

16

Examine and confirm whether the cylinder compression pressure

of engine is normal.

Yes

Next step

No

Remove the

failure

17

Examine and confirm whether the resistance value of

high-voltage wire of any cylinder is normal.

Yes

Next step

No

Replace

18

Examine and confirm whether the ignition coil and high-voltage

wire are damaged or have cracks and etc.

Yes

Replace

No

Next step

19

Examine and confirm whether the sparkle plug operates normally.

Yes

Replace ECU

No

Replace

sparkle plug

Chery T11 Service Manual Electric Injection System

78

9) Unstable idle or shut-down when the load (such as air conditioner and etc.) is

applied

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

Turn on the A/C switch, connect an adaptor between the

ECU and harness, and measure the signal input of the ECU’s

A/C switch and pressure.

Yes

Next step

No

Examine and

repair A/C circuit

3

Examine and confirm whether the A/C system pressure,

compressor’s electromagnetic clutch and A/C pump are

normal..

Yes

Next step

No

Repair or replace

4

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

and confirm whether the voltages of ECU’s No 33, 34, 53

and 54 (output to the idle actuator) pins are normal.

Yes

Next step

No

Examine the

control circuit

5

Disassemble the stepper motor, and examine and confirm

whether the stepper motor is seized or operates inflexibly.

Yes

Repair or replace

the stepper motor

No

Next step

6

Start the engine, switch on the air conditioner, and apply the

failure diagnosis instrument to examine with the help of steps

of stepper motor and confirm whether the idle actuator

operates normally.

Yes

Replace ECU

No

Replace the idle

actuator

Chery T11 Service Manual Electric Injection System

79

10) Periodical instability (ECU must self-learn again after power off)

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

Enable the engine to operate at idle speed, and examine and

confirm whether the intake pressure is between 35 kPa and 55

kPa.

Yes

Next step

No

Remove the air

intake and

leakage

4

Enable the engine to operate at idle speed, shut down these

cylinders one by one, and view whether the engine speed

decreases and fluctuates.

Yes

7

No

Next step

5

Place the ignition switch on the “ON” position. Connect up an

adaptor between ECU and harness, and examine and confirm

whether the voltages of ECU’s intake manifold absolute

pressure sensor output, intake temperature sensor output,

coolant temperature sensor output, oxygen sensor output,

electronic earth and ignition switch pins, and the voltages of

ECU’s No 33, 34, 53 and 54 (outputs to idle actuator) pins are

normal.

Yes

Next step

No

Repair or

replace harness

6

Enable the engine to operate at idle speed, and, after the

coolant temperature reaches the normal value, examine and

confirm whether the ignition advance angle is normal.

Yes

Replace ECU

No

Examine the

others

7

Examine and confirm whether the sensing holes of intake

manifold pressure and intake temperature sensor are jammed.

Yes

Clean

No

Next step

8

Examine and confirm whether the fuel deteriorates or contains

water.

Yes

Replace fuel

No

Next step

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

Next step

No

Examine and

repair the fuel

injector and

related harness

10

Examine and confirm whether the resistance value of

high-voltage wire of any cylinder is normal.

Yes

Next step

No

Replace

11

Examine and confirm whether the ignition coil and

high-voltage wire are damaged or have cracks and etc.

Yes

Replace

No

Next step

12

Examine and confirm whether the sparkle plug operates

normally.

Yes

Replace ECU

No

Replace sparkle

plug

Chery T11 Service Manual Electric Injection System

80

11) Over-high idle (ECU must self-learn again after power off)

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 backstay cable

connecting to the accelerator pedal is seized tightly or too

tight.

Yes

Adjust or replace

No

Next step

3

Examine and confirm whether the canister control valve,

furl pressure regulator, crankcase force ventilation vacuum

pipe and brake system vacuum boost hose are installed

reliably or damaged. .

Yes

Repair or replace

No

Next step

4

Enable the engine to operate, apply the neutral gear, step

on the brake pedal, and view whether the idle speed is

overhigh.

Yes

Next step

No

6

5

Clip the vacuum boost hose, and view whether the idle

turns into the normal.

Yes

Repair or replace the

vacuum booster

No

Next step

6

Clip the crankcase force ventilation vacuum pipe, and view

whether the idle turns into the normal.

Yes

Replace PVC valve

No

Next step

7

Clip the canister control valve hose, and view whether the

idle turns into the normal.

Yes

Replace canister

control valve

No

Next step

8

Examine and confirm whether the idle actuator is inflexible

or seized tightly.

Yes

Repair or replace

No

Next step

9

Examine and confirm whether there is leakage in the other

positions of intake pipe..

Yes

Repair or replace

No

Next step

10

Examine and confirm whether the seal ring of fuel injector

is in good condition.

Yes

Next step

No

Replace the seal ring

11

Examine and confirm whether

Yes

Replace ECU

No

Replace sensor