Getting Started

SAE Publications

SAE has published hundreds of pages of text defining a standard communication protocol that establishes hardware, software, and circuit parameters of OBD II systems. Unfortunately, vehicle manufacturers have different interpretations of this standard communications protocol. As a result, the generic OBD II communications scheme varies, depending on the vehicle. SAE publishes recommendations, not laws, but the Environmental Protection Agency (EPA) and California Air Resources Board (CARB) made many of SAE’s recommendations legal requirements that vehicle manufacturers were required to phase in over a three-year period. 2 Beginning in 1994, vehicles with a new engine management computer

( about 10% of each manufacturers fleet ) were supposed to comply with OBD II standards. For 1995, OBD II systems were to appear on about 40% of the new vehicles sold in the United States. Some of the 1994-1995 OBD II systems were not fully compliant, so the Government granted waivers to give manufacturers time to fine-tune their systems. Beginning in 1996, most of the new vehicles sold in the United States were fully OBD II compliant.

The tables below highlight changes for GM, Ford, and Chrysler. If this seems confusing, don’t worry. The Scan Tool makes it easy. Based on the vehicle identification (VIN) information selected during Scan Tool setup, the vehicle 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 Data LInk Connector on page 2-9.

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.

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Actron CP9185 manual SAE Publications, GM On-Board Diagnostics
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CP9185 specifications

The Actron CP9185 is a highly regarded automotive diagnostic scanner that is designed for both professional mechanics and DIY enthusiasts. This versatile tool brings a plethora of features and advanced technologies, making it essential for anyone looking to diagnose and repair vehicle issues efficiently.

One of the standout features of the Actron CP9185 is its ability to read and clear diagnostic trouble codes (DTCs) from various vehicles. This functionality allows users to quickly identify issues in a wide range of automotive systems, including the engine, transmission, and ABS. The scanner supports OBD II protocols, making it compatible with most vehicles manufactured after 1996, which significantly expands its usability across different makes and models.

The CP9185 comes equipped with an easy-to-read LCD display that showcases real-time data. Notably, this display features live data streaming, allowing users to monitor various parameters such as RPM, coolant temperature, and vehicle speed on-the-fly. This capability aids in pinpointing potential problems that may not be immediately evident from trouble codes alone.

Another important characteristic of the Actron CP9185 is its user-friendly interface. The device includes a built-in help menu and an intuitive navigation system, which simplifies the diagnostic process for users of all skill levels. The rugged design and ergonomic grip ensure durability, making it suitable for frequent use in workshop environments.

In terms of connectivity, the CP9185 features a USB port that allows users to update the device’s software and database. Regular updates ensure that the scanner is equipped with the latest codes and vehicle information, which enhances its effectiveness in performing diagnostics.

The Actron CP9185 also boasts an extensive library of manufacturer-specific codes, which can be invaluable for accurate diagnostics. This feature allows mechanics to delve deeper into vehicle-specific issues, ensuring more precise repairs.

Overall, the Actron CP9185 stands out as a reliable and efficient automotive diagnostic tool that combines essential features with advanced technology. Its comprehensive code-reading capabilities, real-time data display, and user-friendly design make it an indispensable instrument for anyone involved in automotive maintenance and repair. Whether you're a professional technician or a weekend warrior, the CP9185 can significantly enhance your diagnostic capabilities, making it a worthy investment for vehicle care.
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