Chery A15. Manual — part 258

The cylinder spark plug opening clearances shall be the same in order to guarantee the
same ignition energy of each cylinder.
Tips:
In order to ensure the normal operation of the engine, spark plugs must be regularly
replaced with the standard ones from the original manufacturer as per the maintenance
manual, or poor acceleration, unstable idle speed, inaccurate ignition timing, irregular
flameout, increased electromagnetic interference and other unforeseeable faults may be
caused.


Four. High voltage cable (spark plug wire lead)
High-energy and high-voltage ignition is adopted for the system. The high-voltage cable
shall be equipped with proper impedance, capable of voltage endurance and control the
emitted wireless interference electric wave during high-energy and high-voltage ignition.
High-voltage cable resistance:
First cylinder: 3.8k
Second cylinder: 3.2k
Third cylinder: 4.7k
Fourth cylinder: 5.2k





Tips:

• The high-voltage cable and the ignition coil shall be marked with the number of

cylinder. Fix according to the mark. The first cylinder is adjacent to the driving
belt;

• Do not carry out the spark-over test directly to the ground;

• Loosened fixing may lead to ignition coil or computer damage;

• Reinstallation of the high-voltage cable at liberty will result in faults of the

computer components, increased radiation and failure of the electronic
components.

Section Five. Fuel Supply System

One. General description
1. Functions and principles
The function of the fuel supply system is to provide fuel to the cylinder at the right time
according to the instructions given by the engine control module.
Constant-pressure variable-pulse-width sequential fuel injection scheme is adopted for
the system. Therefore, constant-pressure fuel shall be provided by the fuel supply
subsystem.
The system fuel pressure is 300kPa if the fuel returns and 350kPa if the fuel does not
return or only partially returns.
2. System structure

油 泵

油 位 传 感 器

油 泵 总 成

进 油 管

滤 清 器

回 油 管

管 路

油 轨

油 压 调 节 器

喷 嘴

油 轨 总 成

供 油 系 统

Fuel rail assembly

Fuel pump assembly

Spray nozzle

Fuel pressure
regulator

Fuel rail

Fuel return
pipe

Filter

Fuel inlet
pipe

Fuel level
sensor

Fuel pump

Pipeline

Fuel supply system

回油压力调节器

Return fuel
pressure regulator

Two. Fuel pump
1. Functions and principles
The fuel pump assembly consists of the fuel pump,
bracket, fuel level sensor, fuel storage tank
(optional) and fuel pressure regulator (limited fuel
return system). Elastic installation will reduce the
direct impact on the fuel pump by vibration. Its
major function is to provide fuel of sufficient
pressure to the system.
The fuel pump is a turbine-type single-stage
electrical fuel pump. It is controlled by the ECM
through the fuel pump relay. There is one check
valve at the fuel pump outlet, which prevents the
fuel in the pipe from leaking into the fuel tank when
the engine is out of operation so as to guarantee the
component parameters at the next startup.
Fuel level sensor is of a sliding variable resistance
type.
Wiring terminals:


IX4 type: A-relay
B-instrument, C-instrument, D-grounding;
2X2 type: A-instrument, B-relay
C-Grounding, D-instrument;
Installation: installed inside the fuel tank.

2. Component parameters:
Fuel level sensor
- Resistance < 150 Ω
- Max. working current < 130mA
Fuel pump
- Output voltage: > 350kPa
- Outflow: > 10g/s
- Safety pressure relief: < 900kPa
- Pressure retaining:

≈ 24 kPa

- Working voltage: 8-16V
- Overvoltage protection: －13.5～26 (<60S’)
- Operation without fuel < 60S’


3. Fuel pump control circuit diagram

E

C

M

INJ_CYL#4 (INJ C)

INJ_CYL#2 (INJ D)

FP RELAY

85

86

30

87

INJ_CYL#1 (INJ A)

INJ_CYL#3 (INJ B)

A

A

A

A

B

B

B

B

1

2

3

4

油泵

油泵继电

+12V

Fuel pump relay
Fuel pump





4. Fault diagnosis
Tips: All the following judgments are based on the normal operation of the vehicle, wire
harness and other system components.

Fuel pump relay or other circuit faults;

Polluted fuel pump filter;
Damaged fuel pump;
Broken fuel level sensor or deformed rod

Three. Fuel rail assembly
The fuel rail consists of fuel guide pipe, stabilizing chamber, pressure regulator, spray
nozzle and other components The fuel rail provides the pressure regulating volume of
high-pressure fuel and the pipeline to all spray nozzles and the nozzle brackets.
Fixing: it is fixed onto the air intake manifold.











Four. Fuel pressure regulator
1. Functions and principles
The function of fuel pressure regulator is to adjust the fuel pressure and eliminate any
interference with the fuel injection due to changes in fuel supply speed, fuel pump supply
and engine vacuum.
The fuel pressure regulator is controlled by the internal adjusting spring and external
intake manifold vacuum; the differential fuel pressure between the fuel rail and the intake
manifold is always kept the same.
The fuel goes into the spray nozzle through the adjustor.
Fixing: the fuel adjustor is located on one end of the fuel rail; the fuel return system
adjustor is located inside the fuel pump assembly.









2. Component parameters
Pressure setup:
- With vacuum adjusting system: 300kPa
- Without vacuum adjusting system: 350kPa
3. Fault diagnosis