Chery QQ Service Manual download pdf (Page 7)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

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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Chery QQ Service Manual Page 7