Chery A15 / 480 LHD model. Instruction - page 79
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
INPUT / OUTPUT COMPONENTS OF CONTROL SYSTEM
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
18
Diagnostic
connector
19
WORKING MODULE TABLE FOR FUEL INJECTION / IGNITION
SYSTEM
E
ng
ine
Power supply relay
Fuel pump
A/C relay
Idling speed step motor
Fuel injector
Ignition coil
Carbon canister
solenoid valve
Coolant temperature sensor
Throttle valve
position sensor
Air pressure /
temperature sensor
Knock sensor
TDC/rotate speed sensor
Fan relay
Power supply
(Power supply +12V)
Power supply
(15/54)
Malfunction
indicator
· Cooling temperature
overheat alarm light
·Decoder alarm light
·R.P.M. meter
Line K
EN
G
INE
Oxygen sensor heater
Heated Oxygen sensor heater
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.
