Chery A21 2005, Service Manual, Page: 329 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
6
1.4. EXPLANATIONS OF THE ABBREVIATION IN THE MANUAL
DG Speed Sensor DVE Electronic Throttle Valve
DR Fuel Pressure Regulator FPM Accelerator Pedal
ECU Electronic Control Unit (Computer) EKP Fuel Pump
EMS Engine Management System EV Fuel Injector
LSH Heating Oxygen Sensor KS Knock Sensor
KSZ Fuel Distributing Pipe Assembly KVS Fuel Distributing Pipe
ROV Ignition System with Distributor PG Phase Sensor
RUV Ignition System without Distributor TEE Oil Pump Bracket Assembly
TF-W Coolant Temperature Sensor TEV Purge Canister Control Valve
HFM Air Flow Sensor ZSK Ignition Coil
2. ME7.9.7 SYSTEM INTRODUCTION
2.1. SYSTEM BASIC PRINCIPLE
2.1.1 SYSTEM GENERAL INTRODUCTION: ME7.9.7-MOTRONIC EMS
Engine management system (EMS)is composed mainly by three components: sensor, ECU,
and actuator. And these three parts control the intake air quantity, fuel injection quantity and
ignition advance angle. The basic frame is shown in chart 2.1.
Chart 2.1 compose of engine electronic control system
In engine electronic control system, the sensor is the input part used for measuring all kinds
of physics signal (temperature and pressure etc.) and change them to corresponding electronic
signal; the function of ECU is accepting the signal and calculate it according to the
programmed program and generate corresponding output signal to power drive circuit; and
the power drive circuit makes the engine running according to established strategy by driving
every actuator to do different action; at the same time the malfunction diagnosis system of
ECU monitors all parts or control function, and if a malfunction is detected and confirmed it
will memorize malfunction code, transferring
“
limping home
”
function, and when the
malfunction is deleted, the normal value will be desterilized.
Diagnose
Sensor ECU Actuator
Engine
Diagnose
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