The powertrain control module, also known as PCM, is your vehicle’s mind. It deals with the motor, transmission and different frameworks dependent on data it gets from different sensors around the vehicle. It is only one of many microchips on the present vehicles that run everything from the environment control framework to the force windows.
Related: What Is a Dual-Clutch Transmission?
How Does the PCM Work?
The PCM gets signals from sensors that action wind current into the motor and out the exhaust, the coolant temperature, how far down the gas pedal pedals is, the speed at which each wheel is turning and different boundaries.
It at that point utilizes that data to settle on many choices each second, like how much fuel to infuse into every chamber, when to fire the sparkle plugs and when a programmed transmission should change to an alternate gear to convey the best presentation for the current conditions.
A few vehicles allude to the PCM as the “motor control module” or “electronic control unit.” Others, essentially more established ones, have separate control modules for the motor and programmed transmission that stay in steady contact with one another — like BFFs on their iPhones — in light of the fact that the transmission responds to what the motor is doing and the other way around.
At the point when this progression of data between the PCM and other installed PCs and sensors works appropriately, the outcome is smooth and proficient execution, with the PCM consistently rolling out fundamental improvements with no fight.
Yet, really quick and savvy when everything is great, they can be imbecilic as blocks when things turn out badly. For instance, if an oxygen sensor in the fumes framework conks out, the PCM will fix its advanced head and unfit to figure how to change the air-fuel blend going into the motor. The registration light will likely go on — a sob for help — and the motor may run generally, have drowsy speed increase or different issues. Similarly, if the PCM comes up short, the motor will not beginning.
Since PCMs depend so vigorously on contributions from different sources, they at times are dishonestly blamed for causing a registration light or motor issue. Regardless of whether the difficulty code for a registration light focuses to the PCM, mechanics test PCMs and regularly check contributions to ensure it is the guilty party prior to supplanting it.