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