Maintenance Manual for J2 Sedan
Electronic Control System
203
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
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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
）
Torque-based system structure
Determine cylinder load quantity based on intake pressure sensor
Improve control function of gas mixture under static and dynamic conditions
Fuel cylinder-by-cylinder sequential injection
Ignition timing (including cylinder-by-cylinder knock control)
Catalytic converter heating control
Carbon canister control
Connection between torque and external system
Control over central electronic control parts
Complete a series of OBDII
nt system of
etc.
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