Chery A15. Manual - part 252

14. New engine fuel cutoff protection 
When other fuel cutoff is not activated, the new engine protection function will be started once 
the following conditions are satisfied:  

•  20km < accumulated mileage < 2,000km 
•  Cooling fluid temperature < 19.5 ℃ 
•  Or cooling fluid temperature > 30.75℃ 
•  Engine speed higher than 6,400rpm 

 
15. Protection during the warranty period 
- In order to prevent any accumulated mileage errors due to car speed sensor or wiring faults, the 
system uses the following schemes:  

•  Record and indicate any car speed sensor fault; 
•  Record engine running time in the case of car speed sensor fault; 

•  Implement protective measures in the case of car speed sensor fault. 

 
16. Car speed sensor failure protection mode 
- In the following cases, the car speed sensor failure protection mode will be actuated:  

•  Total accumulated mileage is more than 70,000km; 
•  Car speed sensor fault indication appears for more than 10 seconds; 

•  Protection control mode: when the engine speed is higher than 6,400rpm, the system will 

stop the fuel supply. 

 
 
 
 
 
 
 
 
 
 
 

 

Chapter Four System Working Parts 

 
General description 
The Tritec 1.6L engine management system hardware of the SQR7162 vehicle series is 
working under the control of the engine control module (ECM) and consists of the 
subsystems of control and signal collection, fuel supply, ignition, air intake control, 
exhaust control, troubleshooting and communications.  
 

控制及信号采集系统

供油系统

点火系统

进气控制系统

排放控制系统

故障诊断及通讯系统

发动机管

(E

)

理系统

MS

Engine management 
system (EMS)

 
 

Control and signal 
collection 

Fuel supply 

Ignition 

Exhaust control

Air intake control

Troubleshooting

 

 
 

曲轴 转速 及 位置

传感 器

进 气歧 管 压力

器

传 感

冷却 液 温度

传 感 器

排 气氧 含量

传感 器

节 气 门位 置

器

传 感

进

传 感

气 温 度

器

车速

传 感 器

发 动 机管 理系 统

控 制线 束

发 动 机控 制单 元

(ECM)

控制 及 信号 采集 系 统

 

 
 

Control and signal collection system

Engine control module 

Cooling fluid 
temperature 
sensor

 

Air intake 
manifold 
pressure 
sensor

Engine management system control wire harness 

Crank shaft speed 
and position 
sensor 

Exhaust 
oxygen sensor

Throttle 
position 
sensor

Air intake 
temperature 
sensor

Vehicle speed 
sensor

 

 

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 supply system

 
 

氧 传 感 器

三 元 催 化 器

尾 气 排 放 控 制

碳 罐 电 磁 阀

蒸 发 排 放 控 制

排 放 控 制 系 统

 
 

Fuel pump assembly

Pipeline

Fuel rail assembly

 
 

 

 

 

 

 

 

 

 

 

 

Fuel inlet 
pipe

 

Fuel level sensor

 

Fuel pump

 

Spray nozzle

 

Fuel pressure 
regulator

 

Fuel rail

Return pipe

Filter

 
 

Exhaust control system

 
 
 

Exhaust emission control

 

Steam emission control

 

Oxygen sensor

 

Charcoal canister 
solenoid valve

 

Three-way catalyst

 

 
 
 

 

 

发动机故障指示灯

系统通讯接口

故障诊断及通讯系统

Troubleshooting and communications system

 
 
 

Indicator light for engine 
trouble

 

System communications 
terminal

 

 

 

Section One. Power Source and Computer 

 
One. System component power source and wire harness 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ignition switch; fuse 1,2,3,4; Battery; Grounding 
 
1. Function and principles 
12V DC power is adopted for the system. 
The current from the storage battery enters the system and ECM through the ignition key 
switch. It is the major power source for the system and gives system voltage signals to 
the ECM which corrects its control over the operating mechanisms as per the signals 
received.  
Another circuit goes directly into the ECM through the fuse and the uninterrupted power 
source enables the ECM to maintain the self-learned parameters and prepare for the next 
startup at the moment of shutoff.  
2. Fault diagnosis 
Tips:  
All the following judgments are based on the normal operation of the vehicle and other 
system components. 
Normally-closed circuit is mistakenly connected with the ignition switch; wrong 
matching of the wire harness terminals; 
ECM casing grounding may interfere with the signals; 
Bad contact between the power source and the ground wire; 
Interference by the generator, windscreen wiper and second ignition on the power source; 
The wires for the engine speed and crank shaft position sensors and knock sensors are not 
shielded; 
The power source and the grounding shall be checked with a test light.