Getting Started

INTRODUCTION TO ON-BOARD DIAGNOSTICS

The original on-board diagnostics (OBD I) lacked consistency in communication and interface while allowing different interpretations amongst vehicle manufacturers. Ford and Chrysler used different types of engine control computers and data link connectors, and GM varied the trouble codes and communication protocols from year-to-year.

The tables below highlight changes for GM, Ford, and Chrysler. If this seems

 

confusing; don’t worry. Your tool makes it easy. Based on the VIN information

 

selected during Scan Tool setup, the processor is automatically recognized. All

 

you have to do is choose the correct adapter cable and jumper wires (if

 

necessary). Details on adapter cables and jumper wires may be found in

 

Diagnostic Link Connectors (DLC)” on page 2-5

2

.

 

 

 

GM On-Board Diagnostics

 

System

Years

Description

 

 

 

Most vehicles used the 12-pin ALDL (Assembly Line Data Link)

 

OBD I Control Module

1981–1995

located under the dash on the driver side. Some 94-95 vehicles

 

used the 16-pin OBD II (J1962) data link connector (DLC), but

 

 

 

use the Historical application software. Refer to the vehicle’s

 

 

 

Vehicle Emission Control Information label.

 

OBD II Control Module

1994*-Present

Complies with OBD II regulations and uses the J1962 DLC.

 

*OBD II system is used on certain 1994-1995 vehicles equipped with a 2.2L, 2.3L, 3.8L, 4.3L or 5.7L engines.

Ford On-Board Diagnostics

System

Long Name

Years

Description

MCU

Microprocessor Control Unit

1980

–1991

Used in police vehicles, containing carbureted

engines. Uses the MCU DLC.

 

 

 

 

EEC-IV

Electronic Engine Control,

1984

–1995

Most Ford vehicles equipped with North

Fourth generation

American engines. Uses the EEC-IV DLC.

MECS

Mazda Electronic Control

1988

–1995

Vehicles equipped with Mazda-sourced engines.

System

Uses MECS 6-pin and 17-pin DLCs.

EEC-V

Electronic Engine Control,

1994* – present

Complies with OBD II regulations and uses the

Fifth generation

OBD II J1962 DLC.

PTEC

Powertrain Electronic

2000

– present

Complies with OBD II regulations and uses the

Controller

OBD II J1962 DLC.

* EEC-V OBD II system used in 1994-1995 vehicles equipped with a 3.8L or 4.6L engine.

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Actron 9640 user manual Introduction to ON-BOARD Diagnostics, Diagnostic Link Connectors DLC on GM On-Board Diagnostics

9640 specifications

The Actron 9640 is a distinguished automotive diagnostic tool that has garnered attention for its versatility and user-friendly design. Designed for professional mechanics and DIY enthusiasts alike, the Actron 9640 stands out for its comprehensive features and advanced technologies that simplify vehicle diagnostics.

One of the main features of the Actron 9640 is its ability to read and erase diagnostic trouble codes (DTCs) for a wide variety of vehicles. This tool supports OBD II protocols, allowing it to communicate with a vast array of vehicles produced after 1996. The device provides clear, detailed descriptions of any trouble codes, enabling users to quickly identify and address issues. This is vital for efficient troubleshooting and ensures that users can make informed decisions about repairs.

Another significant advantage of the Actron 9640 is its built-in memory. The device can store code definitions and repair solutions for easy reference during diagnostics. Additionally, it features a robust data logging capability, allowing users to capture live data in real-time, which is essential for performing thorough diagnostic evaluations. This functionality helps in monitoring engine performance, thereby assisting in pinpointing issues that may not always trigger a check engine light.

The Actron 9640 also incorporates a user-friendly interface, equipped with a large LCD display that presents information in an easy-to-read format. Its intuitive navigation and menu options cater to users of varying expertise, making it accessible to beginners while still offering the depth of features that seasoned professionals rely on.

In terms of connectivity, the Actron 9640 is designed to be compatible with various vehicles, supporting multiple protocols beyond OBD II, including CAN, J1850, and ISO9141. This broad networking capability ensures that the device can diagnose problems across different car brands and models.

Built with durability in mind, the device features a robust housing that can withstand the rigors of a workshop environment. The ergonomic design ensures a comfortable grip during use, making it practical for extended periods of diagnostics.

Overall, the Actron 9640 combines advanced features, comprehensive functionality, and ease of use, making it an excellent choice for anyone looking to conduct reliable automotive diagnostics. Whether you're a professional mechanic or a casual car owner, the Actron 9640 can help you maintain your vehicle's performance effectively.