Engine control module

Engine Control Module System

Engine control module is known as power train control module or engine control unit

Requirement In A Car

Requirement

The main function of this controllers is to get information from sensors & run

certain actuator.

When getting any problem, then ECU

shows a check engine light in engine

display.

Types Of Sensors

Types Of Sensors

1- Engine coolant temperature sensor

2- Air temperature sensor

3- Manifold absolute pressure sensor

4- Mass air flow sensor

5- Idle air controller

6- Crankshaft sensor

7- Camshaft sensor

8- Throttle position sensor

9- Oxygen sensor

10- Knock sensor

Engine Coolant Temperature Sensor

Its function is to instruct radiator fan to turn on and cooling down the liquid after getting temperature above 75 degree.

Its is usually located at the bottom of radiator or top radiator hose towards engine

block.

Function

Air Temperature Sensor

Function

Air temperature sensor tells temperature of air going into engine.

It is usually located in air filter box or pipe that is attached to the air filter box.

Manifold Absolute Pressure Sensor

Function

This sensor measures air pressure which tells ECM the current altitude of a vehicle.

It is bolted on the intake manifold or linked with a vacuum pipe from intake

manifold.

Mass Air Flow Sensor

Uses

This type of sensor measures the volume of air entering into

engine.

It produces more current to keep temperature required by the manufacturer, it is located

on air cleaner box.

Idle Air Controller

Uses

It works for keeping rpm of engine steady, it is an actuator

not a sensor.

It increases the rpm of car until the coolant temperature sensor

indicates the high engine temperature .

Crank Shaft Sensor

It works to locate the exact position

of crank shaft & to show rpm of

engine.

It is located at the bottom of

engine & closed to crank

shaft

Uses

Camshaft Sensor

The sensor contacts with

ECM for position of camshaft, it is fixed at the end

of camshaft.

It is an electromagnetic

sensor which produces

voltage when a metal object

moves past it.

Uses

Throttle Position Sensor

Uses

This sensor is linked with accelerator pedal and the throttle body, sends

information about injector pulse width & spark timing.

It is located in throttle body and it is not washable nor repairable.

Oxygen Sensor

It can detect the oxygen content so as to know about fuel

amount consumed by the engine. There are two types of oxygen sensors, one is zirconia and

another one is titania.

Uses Of The Sensor

Knock Sensor

Uses

This sensor contains a crystal & the crystal

detects mechanical stress and produces a voltage when the car knocks.

It also allows different grade fuel without any

type of engine problem & it is fixed in engine body.

What Happens When Any sensor Fails

Sometime sensors get failed and do not function

properly.

When getting any type of problem in sensor, then immediately change the

sensor or repair if possible.

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