Chery A series. Manual - part 28

ENGINE ELECTRONIC SYSTEM 

INPUT / OUTPUT COMPONENTS OF CONTROL SYSTEM … …… … … … …G-2 

WORKING MODULE TABLE OF FUEL INJECTION / IGNITION SYSTEM …G-3 

WORKING PRINCIPLE …    …… … … … ……    …… … … … ……    …… … …G-4 

ELECTRICAL CONTROL UNIT ……  …… … … … ……  …… … …………G-5 

WORKING PRINCIPLE OF ELECTRONIC FUEL INJECTION CONTROL AND 

ACTUATORS  …………………………………………………………………………G-7 

BASIC PRINCIPLE OF MALFUNCTION DIAGNOSIS FOR ELECTRONIC FUEL 

INJECTION SYSTEM ………………………………………………………………G-21 

DETAILED TABLE OF MALFUNTION DIAGNOSTIC CODE …………………G-24 

PROCEDURES FOR FAULT DIAGNOSIS ACCORDING TO THE SYMPTOMS OF 

THE ENGINE …… …… …… … …… …… …… …… …… …… …… ……G-62 

SAFETY PRECAUTIONS OF SYSTEM MAINTENANCE ………………………G-88 

SAFETY PRECAUTIONS IN DIAGOSIS AND MAINTENANCE OF THE 

GASOLINE INJECTION ELECTRONIC CONTROL SYSTEM …………………G-88 

SAFETY MEASURES ……………………………………………………………G-89 

 

 

 

 

             

 

G-1

INPUT / OUTPUT COMPONENTS OF CONTROL SYSTEM 

 
 
 

 

19

18 

Diagnostic 
connector 

 
 
 

1 

Engine ECU 

11 Fuel injector 

2 

Air pressure / temperature sensor 

12 Oxygen sensor (heater) 

3 

Engine speed sensor for top dead center 

13 Fuel pump 

4 

Throttle valve position sensor 

14 Carbon canister solenoid valve 

5 

Knock sensor 

15 Two step speed fan controller 

6 

Coolant temperature sensor 

16 Compressor relay control 

7 

Oxygen sensor (

λ signal) 

17 Idling speed step motor 

8 

Air condition request 

18 Diagnostic connection 

9 

Ignition coil and spark plugs 

19 Relay 

10 Instrument 

panel 

   

 

G-2

WORKING MODULE TABLE FOR FUEL INJECTION / IGNITION 

SYSTEM 

 

Power supply relay

Power supply 

(Power supply  +12V)

Power supply 

(15/54) 

Fuel pump 

A/C relay 

Idling speed step motor

Malfunction 
indicator 

Fuel injector

Ignition coil 

Carbon canister 

solenoid valve 

E

ng

in

e 

E

N

G

IN

E

 

Coolant temperature sensor

Throttle valve 

position sensor

Line K

 

Air pressure / 

temperature sensor

Knock sensor 

·

Cooling temperature

overheat alarm light

·

Decoder alarm light

·

R.P.M. meter

 

TDC/rotate speed sensor

Heated Oxygen sensor heater

Oxygen sensor heater

Fan relay 

 

 

G-3

WORKING PRINCIPLE 

This system is capable of controlling the actual tested air-fuel ratio under all engine speeds to 
stay close to the equivalent proportion of the chemical reaction, so as to protect the catalyst 
package and subsequently reduce the discharge of pollution. The oxygen sensor analyses the 
oxygen content of the discharge gas using real-time principle and makes it possible for the 
ECU to control the amount of injecting fuel to correct the air-fuel ratio. The fuel with a 
pressure of about 3.5 bars is directly injected into the air intake manifold near the throttle 
valve.       
 
The fuel injectors of all cylinders are utilizing a sequential phase angle control method 
according to the intake sequence and the opening time of the air intake valves; the injection 
destinations are stored in the ECU map, and can vary autonomously according to the engine 
speeds and intake air pressures. The application of sensors in the system is a basic strategy 
used to correct the engine under all operating conditions. The system is implementing an 
induction type of electrical discharge ignition, where the power source module in the ECU 
controls the ignition timing. The ignition advance angle is calculated according to the engine 
compression ratio and intake air volume. The idling speed is maintained at stable condition 
through controlling the opening of the branch-connection pipe by a step motor and also 
through the changing of the ignition points. 
 
Other than capable of obtaining the input signals and controlling the output components, the 
system has also equipped with various other functions. These functions include the following: 
- When self-diagnose that the sensor is faulty, adopt the restoration strategic control.   
- Restoration of the self-regulating mixed concentration engine and variances in spare parts.   
- Exchange data with the diagnostic tester.   
 
The idling speed of the engine and the amount of CO in the air discharged must not be 
manually adjusted.   

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

G-4