Paul A. Romsky Jr. - Fiero GT ALDL Monitor
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* WARNING *
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Never operate a vehicle while using the Fiero GT ALDL Monitor or Adapters
(Tool) without an assistant. The driver must always have full
attention on driving, therefore, an assistant that is not driving is
required to operate the Tool in order to prevent loss of driving safety.
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* NOTICE *
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The author of the Fiero GT ALDL Monitor and Adapters (Tool) assumes no
liability for its use. The users assume all liability for any damages or
injury resulting from the use of this Tool.
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* NOTICE *
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The GUI will run only on a PC with Microsoft Windows 7 and up operating systems.
This is NOT an Android Application nor will it run on Apple operating systems.
The GUI will work on Windows XP but the drivers for the Adapter will not as XP is
no longer supported by Microsoft or by Adafruit.
The Fiero GT ALDL Monitor Adapter and GUI work only with
GM Pontiac Fieros 1986 to 1988 V6 2.8L MPFI ECMs Only.
No other model year or ECM is supported.
The Fiero 1985 V6 2.8L MPFI ECM is different and is not
supported. None of the 4 Cylinder Fiero ECMs are supported.
The following links are screen shots of the Assembly Line Diagnostic Link (ALDL) Diagnostic Tool developed for Fieros. Pontiac Fieros were built before On-Board Diagnostics I (OBD-I) and On-Board Diagnostics II (OBD-II) were standardized. General Motor's (GM's) predecessor to OBD was the ALDL which simply outputs a constant stream of parameters so that the vehicle's Electronic Control Module (ECM) could be used to test and monitor the engine performance. Today, it is very difficult to find ALDL scanners on the open market, and the fact that GM was never forth coming on how ALDL worked only exasperated the problem. Fortunately, I have found various web sites that describe how the ALDL protocol works, so I decided to try my hand at interpreting these unique data streams. The Fiero ALDL Monitor GUI is the first result of that effort.
Note: These screens shots are not always up to date with the actual GUI, but they are close to the current revision.
Note: The Fiero ALDL Monitor GUI will work without the Adapter, but only playback files previously recorded and/or captured can be performed. When an Adapter is connected, Monitor, Record, and Capture can be performed as well. The GUI can also be used standalone without an Adapter to look-up Error Code (EC) definitions.
Fiero GT ALDL Monitor showing Playback Parameters and Playback Mode Panel
Fiero GT ALDL Diagnostic Tool - GUI Lamp Test
Fiero GT ALDL Diagnostic Tool - About
Fiero GT ALDL Diagnostic Tool - Adapter Check
Fiero GT ALDL Diagnostic Tool - Help
Fiero GT ALDL Diagnostic Tool - Setup
Fiero GT ALDL Diagnostic Tool - TPS Set Limits Utility
Fiero GT ALDL Diagnostic Tool - Mark Recording With Comment
Fiero GT ALDL Diagnostic Tool - Playback Modes
Fiero GT ALDL Diagnostic Tool - Playback
Fiero GT ALDL Diagnostic Tool - Mark And Comment Displayed Playback
Fiero GT ALDL Diagnostic Tool - Graph
Fiero GT ALDL Diagnostic Tool - Trace Identify
Fiero GT ALDL Diagnostic Tool - Performance Curves
Fiero GT ALDL Diagnostic Tool - Air/Fuel Blocks
Fiero GT ALDL Diagnostic Tool - O2/Voltage/AFR/Lambda Graph
Fiero GT ALDL Diagnostic Tool - Status Flags
Fiero GT ALDL Diagnostic Tool - Status Flag Info
Fiero GT ALDL Diagnostic Tool - Malfunction Flags
Fiero GT ALDL Diagnostic Tool - Malfunction Flag Info
Fiero GT ALDL Diagnostic Tool - Knocks Blocks
Fiero GT ALDL Diagnostic Tool - SES Error Codes
Fiero GT ALDL Diagnostic Tool - SES O2 Sensor
Fiero GT ALDL Diagnostic Tool - Error Code Info
Fiero GT ALDL Diagnostic Tool - Reference Slides
Fiero GT ALDL Diagnostic Tool - Recording Validation Utility
Video (11:04 minutes:seconds): Fiero GT ALDL Monitor and Adapter In-Car Demonstration
Video (9:21 minutes:seconds): Zanrith using the Fiero GT ALDL Monitor and Adapter Driving Demonstration
Please note: The Adapters are no longer sold by me directly. They are now available through
The Fiero Store
Purchase Adapter
This is a photo of the latest version of the Fiero GT ALDL Adapter as of 04 MAR 2025.
Based on the Adafruit Trinket M0 Microcontroller
The Fiero ALDL Monitor software is free. It currently does not support the Serial ALDL Cables that are popular, the special High Performance Adapter (based on the Adafruit Trinket M0) must be used - contact me via E-mail for details.
Paul Romsky may be reached via E-mail at romsk22@gmail.com
Download the Fiero ALDL Monitor GUI V1.6.49
Version 1.6.49 Dated 12 MAR 2025 2:32 PM EDT - Latest GUI Code.
Version 1.6.49 and up supports the High Performance ALDL Adapter based on the:
Adafruit Trinket M0 Microcontroller
Download and Installation Instructions:
