G4 – Blue Memcal style chip adapter for some 94-95 vehicles G3 – Multiple program switching version of G1 G2X – Multiple program switching version of G2 G1 – “Memcal” style chip adapter (TPI, Syclone/Typhoon, 94-95 TBI, 92-93 LT1, etc.) Instead of buying the BURN2, Ostrich2 and ALDU1 separately, you can buy the APU1 unit that does the functions of all three pieces in one unit. For the 1995 model year, CABL2 is required due to the physically different connector. For 86-94 vehicles, CABL1 is required to connect the logger and the vehicle. Logging from the computer is accomplished using either an ALDU1 or the logging facilities of an APU1. Alternatively, you can either use the Ostrich 2.0 emulator or the emulation facilities of the APU1 to make changes while the vehicle is running.
You can burn chips using a ROM burner such as the BURN1/2. The same EPROMs can be used for all of our OBD1 GM products (except the switching adapters…) which is usually the 27SF512 – C2.Īfter a chip adapter has been installed in an ECM, tuning can begin. Some chip adapters require soldering for installation (G2, G2X) but most do not (G1, G3, G4, G5).
First, a “chip adapter” is used to convert whatever the ECM in question needs into a form that accepts a 28 pin EPROM. The process for tuning OBD1 GM products is pretty much the same for all 86-93 model years. Many Grand Prix from these years use the G4 adapter. Some (like the 94-95 TBIs) use a G1 adapter. Many of these ECMs support being reflashed over the ALDL interface (e.g. Hardware for OBD1 GM Overviewĩ4-95 model years are oddballs. All the vehicles of this generation speak the ALDL protocol for logging/vehicle communication.įor purposes of this guide, “ECM” means Engine Control Module, Powertrain Control Module (PCM), Engine Computer Module (ECM) – terms will be used interchangeably to mean the same thing. These cars used several different types of engine controller – some have one injector for each cylinder (Tuned Port Injection, or TPI along with the LTx motors) while some have fewer injectors that are placed near the throttle body (Throttle Body Injection, or TBI) instead. When we talk about “OBD1” GM vehicles, we mean vehicles made from (approximately) 1986 to 1995. (eventually this page will have more information) Basics
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