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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

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 .........................................7

2. ME7.9.7 SYSTEM INTRODUCTION....................................................................................................7

2.1. SYSTEM BASIC PRINCIPLE.....................................................................................................7

2.1.1 SYSTEM GENERAL INTRODUCTION: ME7.9.7-MOTRONIC EMS .......................7

2.2. CONTROL SIGNAL: ME7.9.7 SYSTEM INPUT/OUTPUT SIGNAL....................................9

2.3. INTRODUCTION OF SYSTEM MALFUNCTION DIAGNOSIS FUNCTION...................10

2.3.1. MALFUNCTION INFORMATION RECORD .............................................................10

2.3.2, CONTROL STRATEGY OF FAILURE LAMP ............................................................10

2.3.3, DIAGNOSIS METER CONNECTION..........................................................................11

2.3.4, READ MALFUNCTION INFORMATION BY WINK CODE....................................11

3. WORKING PRINCIPLE AND CHARACTER OF EFI SYSTEM ELEMENT...............................11

3.1 ELECTRONIC CONTROL UNIT - ECU..................................................................................11

3.2 COOLANT TEMPERATURE SENSOR....................................................................................15

3.3 KNOCK SENSOR ........................................................................................................................16

3.4 OXYGEN SENSOR......................................................................................................................17

3.5 SPEED SENSOR (CRANKCASE POSITIONING SENSOR).................................................18

3.6 PHASE SENSOR (CAM SHAFT POSITIONING SENSOR)..................................................20

3.7 ELECTRIC FUEL PUMP............................................................................................................21

3.8 ELECTROMAGNETIC INJECTOR.........................................................................................22

3.9 AIR FLOW SENSOR ...................................................................................................................23

3.10 DOUBLE SPARK IGNITION COIL........................................................................................24

3.11 CARBON CANISTER SOLENOID VALVE............................................................................26

3.12 FUEL PRESSURE REGULATOR............................................................................................27

3.13 ELECTRONIC THROTTLE VALVE AND ACCELERATOR..............................................28

3.14 FAN CONTROL .........................................................................................................................29

3.15 AIR CONDITIONER CONTROL ............................................................................................30

4 ME7 SYSTEM TESTAND REPAIR ACCORDING TO TDC ...........................................................31

4.1 ENGINE DTC (DIAGNOSTIC TROUBLE CODE) LIST.......................................................32

4.2 DIAGNOSIS FLOW WHEN THERE IS DIFFERENT DTC...................................................33

5. TYPICAL FAILURE AND ITS DIAGNOSIS FLOW.........................................................................56

5.1 EXPLANATION ...........................................................................................................................56

5.2 TYPICAL FAILURE DIAGNOSIS FLOW................................................................................57

1. The engine does not rotate or rotate slowly when it is started ............................................57

2. The engine can draw rotating but can not start successfully when it is started. ...............58

3. It is hard to start the heating car. ..........................................................................................59

4. It’s hard to start the cold car..................................................................................................60

5. Normal engine speed but hard to start at any time..............................................................61

6. Regular starts but the idle speed is not steady at any time..................................................62

7. Regular starts but the idle speed is not steady during engine heating. ..............................63

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Podsumowanie treści

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM1CONTENT1. NOTICE TO THE EFI SYSTEM SERVICE ...

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM10 Cooling fan relay2.3. INTRODUCTION OF SYSTEM MALFUNCTION DIAGNOSIS FUNCTION2.3.1. MALFUNCTION INFORMATIO

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM11★ Output winking code that is P-CODE value after the K cable contact with the groundmore than 2.5 seconds.

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM12 Idle speed control Knock control Provide sensor power: 5V/100mA Closed loop control Control carbon c

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM1316 Accelerator position sensor 5717 Sensor 1 58 Brake switch18 Upstream oxygen sensor 59 Speed signal19 Kn

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM14 Malfunction phenomena: idle speed not stable, accelerating not good, can not start, idlespeed is too hig

Strona 7 - Sensor ECU Actuator

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM153.2 COOLANT TEMPERATURE SENSOR1)exterior drawing and pinThis sensor has two exchangeable pins.2)Purpose: T

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM16(Disassemble the joint)leave the digitalmultimeter at ohm shift and contact the No.1and No. 2 pin of the s

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM17 Malfunction phenomenon: badnessaccelerating. Normal malfunction reason: all kinds ofliquid such as oil,

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM18tube inside. The working of oxygen sensor iscarried out by transferring the concentrationdifference of the

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM19Service notice: For the inductive engine speed sensor, it ispermitted to take out from its pack before it

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM28. Regular starts but idle speed is not steady after the engine heating...6

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM203 sensor connectors. The rated resistance is860Ω±10% When it is 20★3.6 PHASE SENSOR (CAM SHAFTPOSITIONING

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM213.7 ELECTRIC FUEL PUMP1)Exterior drawing and pinThe electric fuel pump has two pins connectingto pump rela

Strona 15 - Coolant Temperature Sensor

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM22has different flow according to therequirement of engine, but with the sameexterior looking.The pump which

Strona 16 - Knock sensor

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM23conquer Return spring pressure, needle valvegravity and friction force, the needle valve begin torise up a

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM24make the heat exchange different of the heatdiaphragm of both sides.This will make the temperature of two

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM25pin of ECU; No. 3 and No.4 pins connect with poweranode.2)Installation position: on the engine3)Purpose: I

Strona 19 - Speed sensor

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM263.11 CARBON CANISTER SOLENOID VALVE1)Exterior drawing and pin definitionCanister control valve only has tw

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM27joint) leave digital multimeter to ohm shift, twometer pen connect to the pins of canister valve,it is 26±

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM28causticity liquid to wash it; 3, avoid it fromdistorting by outside force.Simple measurement method: conne

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM29requirement of the engine working conditionsaccording to the impulse signal frequency and widthof impulse.

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM3EFI SERVICE MANUALA21 car is equipped with ME7.9.7 EFI system which developed by UAES. This manual willintr

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM30Short circuits from low-speed relay line togroundOpen circuits of low-speed relay lineEngine coolant tempe

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM31Blower circuit malfunction (fuse is burnt, relaycircuit is open circuit or short circuit)Irregular pressur

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM324.1 ENGINE DTC (DIAGNOSTIC TROUBLE CODE) LISTDTC Definition DTC DefinitionP0107Much lower voltage of the a

Strona 27 - Pressure Regulator

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM33P0335 Crank shaft position sensor signal failure P0647Much higher voltage of airconditioner compressor rel

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM34value changes of diagnostic tester “air intake pressure”,the changes should be not big; step on the accele

Strona 29 - Double-Speed Fan

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM35DTC P0112 Circuit voltage is much lower of the throttle position sensorNo. Operating steps Result Follow u

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM36YesRepair orreplacecable5Check if it is short circuit to ground between ECU pinNo. 17, No. 40 and sensor c

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM37at that time).Notice: if the value always is - 40★ there is perhaps open circuit failure in the circuit.Ye

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM38DTC: P0123 Circuit voltage is much higher of the throttle position sensorNo. Operating steps Result Follow

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM39No. Operating steps Result Follow up steps1Connect the diagnostic tester and commutator, put theignition s

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM4not disassemble the fuel pump at random when carrying out service for fuel system.Before disassemble the fu

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM40connectors C (white) and D (white) using multimeter,and observe if it is 2-5Ω when it is 20★.No Change sen

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM41DTC: P0172 Closed loop air fuel ratio control self adapting exceeds it minimum limit(Notice: below diagnos

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM42diagnosis datacylinder injector pin No.2 and power supply cathode,and observe if it is around 3.7V.No Diag

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM43cylinder injector pin No.2 and power supply cathode,and observe if it is around 3.7V.No Next stepYesRepair

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM44cableor to power supply between relay control ends that isrelay pin No.85 and ECU pin No.69.No Diagnosis h

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM45YesRepair or replace thecable3Check if there is open circuit or short circuit toground or to power supply

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM46DTC: P0340 Phase sensor signal failureNo. Operating steps Result Follow up steps1Connect the diagnostic te

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM47DTC: P0343 Much higher voltage of the phase sensorNo. Operating steps Result Follow up steps1Connect the d

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM48DTC: P0444 Much lower voltage of canister control valve drive grade control circuitNo. Operating steps Res

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM49No Diagnosis helpDTC: P0480 Air conditioner condenser cooling fan relay control circuit failureNo. Operati

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM5Tool name:EFI system diagnostic testerFunction:Read/clear the breakdown code in EFI andinspect data, test p

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM50replace cablesupply or to ground between the circuit of speedsensor and ECU pin No. 59.No Diagnosis helpDT

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM51DTC: P0508 Idle speed regulator control circuit voltage is too lowNo. Operating steps Result Follow up ste

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM52Yes Next step2Check the accumulator voltage by multimeter if it is around12V.NoReplaceaccumulatorYesRepair

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM53cablehttp://WWW.FORA-CLUB.RU

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM54DTC: P0601 ECU testing code failureNo. Operating steps Result Follow up steps1Connect the diagnostic teste

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM55DTC: P0646 Much lower voltage of air conditioner compressor relay control circuitNo. Operating steps Resul

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM56DTC: P1651 Trouble light control circuit failureNo. Operating steps ResultFollow upsteps1Connect the diagn

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM57（6）Check the sensor and actuator joint if it is loosening or bad contact.Important notice: if the above ph

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM582. The engine can draw rotating but can not start successfully when it is started.General failure componen

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM593. It is hard to start the heating car.General failure component: 1) water inside of fuel; 2) fuel pump; 3

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM6Tool name:Pressure gauge for cylinderFunction:Inspect the pressure in every cylinder.Tool name:Fuel injecto

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM604. It’s hard to start the cold car.General failure component: 1), water in the fuel; 2), fuel pump; 3), co

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM615. Normal engine speed but hard to start at any time.General failure component: 1), water in fuel; 2), fue

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM626. Regular starts but the idle speed is not steady at any time.General failure component: 1), water in fue

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM637. Regular starts but the idle speed is not steady during engine heating.General failure component: 1), wa

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM648. Regular starts but idle speed is not steady after the engine heating.General failure component: 1), wat

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM659. Regular starts but idle speed is not steady or dying out when there is partial loading.General failure

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM6610. Regular starts with high idle speed.General failure component: 1) throttle valve and idle speed by pas

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM6711. Low engine speed or dying out exists when it is accelerated.General failure component: 1) water in fue

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM6812. React slowly when it is accelerated.General failure component: 1) water in fuel; 2) air intake pressur

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM6913. The performance is poor when it is accelerated.General failure component:1) water in fuel; 2) air inta

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM71.4. EXPLANATIONS OF THE ABBREVIATION IN THE MANUALDG Speed Sensor DVE Electronic Throttle ValveDR Fuel Pre

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM70Yes Next step11 Check the exhaust pipe if the air exhausting is smoothNoRepair orreplaceexhaust pipeYesDia

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM8Engine electronic control system schematic of ME7.9.7 chart 2.2Chart 2.2The basic component of ME7.9.7 engi

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM9ME7.9.7 engine management system is an electronic gasoline control system, and it canprovide lots of contro