GM Enhanced (OBD II) Diagnostics

GM ENHANCED (OBD II) DIAGNOSTICS

IMPORTANT

This system applies to GM vehicles manufactured from 1996 to present. Some GM vehicles in 1994 and 1995 were equipped with

this system. Refer to “Appendix A - Data Link Connectors". GM

vehicles manufactured from 2002 to present automatically use Global OBD II Diagnostics.

✓If an Error Message displays, make sure the OBD II connector is securely attached, and the ignition key is ON. Cycle the ignition key to OFF for 10 seconds, then ON. This may be required to reset the computer. If required, select YES to try again. If the problem still exists, refer to “Error Messages” on page 9-2.

✓Specific GM Enhanced functions are defined in this section. Refer to “Section 4 - Global OBDII Diagnostics" for other functions.

Manual Info

The Manual Info function, instructs the user what section of the manual to use. This section covers GM Enhanced (OBD II) Diagnostics.

I/M Readiness

5

Refer to “” on page 4-1 of Global OBDII Diagnostics.

Read Codes

The Read Codes function retrieves Diagnostic Trouble Codes (DTCs) from the vehicle’s computer module(s). This function can be performed with the KOEO or KOER. These codes cause the computer to illuminate the Malfunction Indicator Lamp (MIL) when an emission-related or driveability fault occurs. The MIL is also known as the “service engine soon” or “check engine” lamp.

The GM Enhanced reads DTC’s from the engine or powertrain module (ENG), Transmission Module (Trans), or Transfer Case Module (XFER).

TRANS Hist P1800

XFER B2725

TCM Power

Active Trnsfr Case

Control

Relay

Mode Switch Malf

Circuit

Open

 

Transmission Module

Transfer Case Module

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Actron 9640 user manual GM Enhanced OBD II Diagnostics, Readiness, Trans Hist P1800, Xfer B2725
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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.
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