![]() ![]() The software may also include information on how to handle communications from other onboard modules such as the ABS/traction control/stability control system, climate control system, body controller, air bag module, keyless entry system and so on. This includes all the things the PCM controls such as spark timing, fuel mixture, various emissions functions (EGR, EVAP, PCV, etc.), transmission shifting and torque converter lockup (unless these jobs are handled by a separate transmission control module), theft deterrence and self-diagnostics (including OBD II monitors and self-test procedures). The software tells the PCM how to process its various sensor inputs and other requests so the vehicle operates normally. Like any laptop or desktop computer, the powertrain control module (PCM) in a car or truck contains a software program that tells it what to do. ![]()
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