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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