Chery Fora (Elara A520). Manual — part 140

52

7.3 Check

1)

Check the oil clearance of crankshaft
main journal.

a)

Clean the journal and bearing bushing.

b)

Installation of crankshaft

c)

Cut the plastic gauge to make it have the
same length with that of the bearing, and
then put it onto the crankshaft journal to
make it parallel with the central line of
shaft.

d)

Install the master bearing cap carefully,
and fasten the bolts to specified torque.

e)

Dismantle the master bearing cap
carefully.

f)

Use the measuring rule on the packaging
bag of plastic gauge to measure the
width of the widest portion of flattened
plastic wire, and get the clearance value.

Standard value

Limit
value

Clearance

0.022

0.058

If the clearance value exceeds the limit value,
please replace the bearing bushing.

Note: When replacing the bearing bushing,
you must replace the whole group of bearing
bushings.

2)

Measure

the

axial

clearance

of

crankshaft

After

mounting

the

crankshaft, you can use micrometer
guage to measure the axial clearance.

Standard value

Limit

value

Clearance

0.07

0.265

If the measured value exceeds the limit value,
please replace the thrust washer.

Plastic Gauge

53

7.4 Installation

1)

Clean up the short engine, and apply
engine lubricant.

2)

Install the crankshaft correctly, and
mount the thrust washer in proper
position.

3)

Latch on the cylinder block frame, and
fasten the crankshaft fixed bolts.

The fastening sequence is illustrated in the
figure.

Torque:

4)

Mount the bolts onto the frame
periphery, and fasten them.

Torque:

5)

Mount oil strainer, oil pan, front and
rear oil seals of crankshaft and oil pump.

6)

Mount engine accessories, lift and
install the engine onto the car, mount
water pipe, and insert all electrical
plugs.

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

1

CONTENT

1. NOTICE TO THE EFI SYSTEM SERVICE . . . . . . . . . . . . . . . . . . . . . . .3

1.1. GENERAL SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3

1.2. NOTICE DURING THE SERVICE. . . . . . . . . . . . . . . . . . . . . . . .3

1.3. SERVICE TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.4. EXPLANATIONS OF THE ABBREVIATION IN THE MANUAL. . . . . . . . . . .6

2. ME7.9.7 SYSTEM INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1. SYSTEM BASIC PRINCIPLE. . . . . . . . . . . . . . . . . . . . . . . . . .6

2.1.1 SYSTEM GENERAL INTRODUCTION: ME7.9.7-MOTRONIC EMS . . . . . ...6

2.2. CONTROL SIGNAL: ME7.9.7 SYSTEM INPUT/OUTPUT SIGNAL. . . . . . . . . 8

2.3. INTRODUCTION OF SYSTEM MALFUNCTION DIAGNOSIS FUNCTION. . . . . .9

2.3.1. MALFUNCTION INFORMATION RECORD . . . . . . . . . . . . . . . ...9

2.3.2, CONTROL STRATEGY OF FAILURE LAMP . . . . . . . . . . . . . . . ..9

2.3.3, DIAGNOSIS METER CONNECTION. . . . . . . . . . . . . . . . . . ..10

2.3.4, READ MALFUNCTION INFORMATION BY WINK CODE. . . . . . . . . 10

3. WORKING PRINCIPLE AND CHARACTER OF EFI SYSTEM ELEMENT. . . . . . . ...10

3.1 ELECTRONIC CONTROL UNIT - ECU. . . . . . . . . . . . . . . . . . . . ..10

3.2 COOLANT TEMPERATURE SENSOR. . . . . . . . . . . . . . . . . . . . . 14

3.3 KNOCK SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.4 OXYGEN SENSOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..16

3.5 SPEED SENSOR (CRANKCASE POSITIONING SENSOR). . . . . . . . . . . . .17

3.6 PHASE SENSOR (CAM SHAFT POSITIONING SENSOR) . . . . . . . . . . . . ..19

3.7 ELECTRIC FUEL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . ...20

3.8 ELECTROMAGNETIC INJECTOR. . . . . . . . . . . . . . . . . . . . . . .21

3.9 AIR FLOW SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...22

3.10 DOUBLE SPARK IGNITION COIL. . . . . . . . . . . . . . . . . . . . . . 23

3.11 CARBON CANISTER SOLENOID VALVE. . . . . . . . . . . . . . . . . . . 25

3.12 FUEL PRESSURE REGULATOR. . . . . . . . . . . . . . . . . . . . . . . 26

3.13 ELECTRONIC THROTTLE VALVE AND ACCELERATOR. . . . . . . . . . . ..27

3.14 FAN CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

3.15 AIR CONDITIONER CONTROL. . . . . . . . . . . . . . . . . . . . . . . 29

4 ME7 SYSTEM TEST AND REPAIR ACCORDING TO TDC . . . . . . . . . . . . . . ...30

4.1 ENGINE DTC (DIAGNOSTIC TROUBLE CODE) LIST. . . . . . . . . . . . . ...30

4.2 DIAGNOSIS FLOW WHEN THERE IS DIFFERENT DTC . . . . . . . . . . . . ..32

5. TYPICAL FAILURE AND ITS DIAGNOSIS FLOW. . . . . . . . . . . . . . . . . . .52

5.1 EXPLANATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...52

5.2 TYPICAL FAILURE DIAGNOSIS FLOW . . . . . . . . . . . . . . . . . . . ...53

1. The engine does not rotate or rotate slowly when it is started . . . . . . . . . . . 53

2. The engine can draw rotating but can not start successfully when it is started. . . . ...54

3. It is hard to start the heating car. . . . . . . . . . . . . . . . . . . . . . . ..55

4. It’s hard to start the cold car.. . . . . . . . . . . . . . . . . . . . . . . . .56

5. Normal engine speed but hard to start at any time. . . . . . . . . . . . . . . . 57

6. Regular starts but the idle speed is not steady at any time. . . . . . . . . . . . . 58

7. Regular starts but the idle speed is not steady during engine heating. . . . . . . . ..59

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

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8. Regular starts but idle speed is not steady after the engine heating.. . . . . . . . ..60

9. Regular starts but idle speed is not steady or dying out when there is partial loading. ...61

10. Regular starts with high idle speed. . . . . . . . . . . . . . . . . . . . . . 62

11. Low engine speed or dying out exists when it is accelerated. . . . . . . . . . . . 63

12. React slowly when it is accelerated.. . . . . . . . . . . . . . . . . . . . . .64

13. The performance is poor when it is accelerated. . . . . . . . . . . . . . . . . 65