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.