Gm Mode 22 Scan Tool By Terry Direct

The tool records data at up to 8-10 frames per second (depending on cable speed). You can drive the car, log the run, and then review parameters like knock retard under load, TPS drop-out, or O2 sensor cross-counts—critical for tuning or finding intermittent misfires.

This is where Terry’s tool beats any generic scanner. You can command:

Currently, most GM-specific scan tools (and generic ELM327 tools) require the user to dig through long, alphabetized lists of PIDs (Parameter IDs) to find specific modules, and then navigate separate menus for bi-directional controls. gm mode 22 scan tool by terry

Smart-Actuator Express would be a context-aware dashboard that groups specific outputs and inputs relevant to the current diagnostic mode, enabling "One-Touch" testing for common GM problem areas.

Unlike a $50 Amazon scanner, Terry’s tool is not just a code reader. It is a full-blown diagnostic suite. Here is what you get: The tool records data at up to 8-10

Designed specifically for 8192-baud ALDL GM vehicles, typically:

While Terry’s original tool remains beloved for its simplicity and low cost (often free), modern alternatives exist: You can command: Currently, most GM-specific scan tools

| Tool | Protocol | Price | Best For | |------|----------|-------|-----------| | GM Mode 22 by Terry (legacy) | ALDL Mode 22 | Free | Budget, simple diagnostics | | Scan9495 | ALDL Mode 22 | $30 shareware | LT1/LT4 specific (94-95) | | TunerPro RT | ALDL + OBD-II | Free (donation) | Advanced tuning & logging | | ALDLLogger | ALDL Mode 22 | Free | Mac/Linux users | | Tech 1 w/ GM cartridge | All GM modes | $500+ used | Professional restoration |

TunerPro RT is the most powerful modern equivalent. It uses the same Mode 22 principle but adds a visual dashboard, custom definition files (XDFs), and live checksums. However, many old-school mechanics still reach for Terry’s tool because it requires no configuration—plug and play for most $8D and $EE masks.