Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
203
XIII.
Electronic Control Module (ECM) of Engine
1. System description
The greatest characteristic in the electronic control system of the M7 engine is the adoption of
torque-based control strategy. The torque-based control strategy is mainly intended to link a great
amount of different control objectives. This is the sole method to integrate flexibly all kinds of functions
into different variants of ECU depending on the engine and vehicle models.
In the engine electronic control system, the sensors are functioned as input parts to measure all kinds of
physical signals (temperature, pressure, etc.) and convert to corresponding electric signals, the ECU is
functioned to receive the input signals from sensors, calculate and process as per preset programs,
generate corresponding control signals, and output to power drive circuits, and the power drive circuits
execute different actions by driving corresponding actuators and control the engine to run as per preset
control strategy. At the same time, the malfunction diagnosis system of ECU monitors various
components and control functions in the system. Once a malfunction is detected and confirmed, the
system will save the malfunction code and activate the “Limp home” function. Upon the detection that
the malfunction is resolved, the system will resume to normal values.
1
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Functions
Torque-based system structure
Determine cylinder load quantity based on intake pressure sensor
Improve control function of gas mixture under static and dynamic conditions
λ
closed-loop control
Fuel cylinder-by-cylinder sequential injection
Ignition timing (including cylinder-by-cylinder knock control)
Exhaust control function
Catalytic converter heating control
Carbon canister control
Idling control
Limp home
Anti-theft device function
Connection between torque and external system
Control over central electronic control parts
Complete a series of OBDII control functions
Used for management system of diagnosis function
etc.