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