Craftsman 14063 manual Basic Engine Computer Control System, Typical Computer Control System

Page 11

Onboard Diagnostics

COMPUTER ENGINE CONTROLS

The Basic Engine Computer Control System

The Computer Control System consists of an on-board computer and several related control devices (sensors, switches, and actuators).

The on-board computer is the heart of the Computer Control System. The computer contains several programs with preset reference values for air/fuel ratio, spark or ignition timing, injector pulse width, engine speed, etc. Separate values are provided for various driving conditions, such as idle, low speed driving, high-speed driving, low load, or high load. The preset reference values represent the ideal air/fuel mixture, spark timing, transmission gear selection, etc., for any driving condition. These values are programmed by the vehicle manufacturer, and are specific to each vehicle model.

Most on-board computers are located inside the vehicle behind the dashboard, under the passenger’s or driver’s seat, or behind the right kick panel. However, some manufacturers may still position it in the engine compartment.

Vehicle sensors, switches, and actuators are located throughout the engine, and are connected by electrical wiring to the on-board computer. These devices include oxygen sensors, coolant temperature sensors, throttle position sensors, fuel injectors, etc. Sensors and switches are input devices. They provide signals representing current engine operating conditions to the computer. Actuators are output devices. They perform actions in response to commands received from the computer.

The on-board computer receives information inputs from sensors and switches located throughout the engine. These devices monitor critical engine conditions such as coolant temperature, engine speed, engine load, throttle position, air/fuel ratio etc.

The computer compares the values received from these sensors with its preset reference values, and makes corrective actions as needed so that the sensor values always match the preset reference values for the current driving condition. The computer makes adjustments by commanding other devices such as the fuel injectors, idle air control, EGR valve or Ignition Module to perform these actions.

OUTPUT DEVICES

Fuel Injectors

Idle Air Control

EGR Valve

Ignition Module

On-Board

Computer

INPUT DEVICES

TYPICAL COMPUTER CONTROL SYSTEM

Coolant Temperature Sensor

INPUT DEVICES

Throttle Position Sensor

Oxygen Sensors

Fuel Injectors

 

Craftsman 14063

9

,

Page 10 Page 12
Image 11
Page 10 Page 12
Contents Page Table of Contents Introduction What is OBD?Easy To Use You Can Do ItSafety First Safety PrecautionsOBD Certified Data Link Connector DLC LocationAbout the Code Reader Vehicles CoveredControls and Indicators Controls and IndicatorsDisplay Functions Display FunctionsAbout the Code Reader Introduction of Electronic Engine Controls Onboard DiagnosticsComputer Engine Controls Typical Computer Control System Basic Engine Computer Control SystemOn-Board Diagnostics Second Generation OBD2 On-Board Diagnostics First Generation OBD1OBD2 Terminology Not all vehicles support all fifteen Monitors Diagnostic Trouble Codes DTCs 2 0 DTCs and MIL Status OBD2 Monitors OBD2 MonitorsNon-Continuous Monitors Onboard Diagnostics Onboard Diagnostics Onboard Diagnostics Onboard Diagnostics Onboard Diagnostics DTC OBD2 Reference TableName Monitor Before YOU Begin Preparation for TestingCode Retrieval Procedure Using the Code ReaderLED Erasing Diagnostic Trouble Codes DTCs Using the Code Reader Minimum System Operating Requirements About RepairsolutionsAccessing RepairSolutions Hardware RequirementsUsing the Code Reader Vehicle Applications Makes Covered Vehicle Applications ABSReplacement Parts Warranty and ServicingCraftsman TWO Year Full Warranty
Top Page Image Contents