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Because of their complexity, today’s vehicles depend on computers for managing many of their features. These features include the ability to adjust the air-to-fuel ratio and gear ratio on the fly. Whereas older vehicles relied on a mechanic to set all of these metrics – a classic “tune-up” – modern vehicles use computers, which has…
These days, it’s impossible to maintain your car without a good understanding of its computer systems. Gone are the days of adjusting your timing belt or setting your own fuel-to-air ratio. Nowadays, those functions are controlled by three computers: Engine control module (ECM) Powertrain control module (PCM) Transmission control module (TCM). Today, we’re going to…
If your vehicle suddenly refuses to start, and you’ve exhausted the more mundane causes such as a dead battery, it’s possible that you have a faulty ECM (engine control module) or engine computer. The engine control module is one of the important parts of your vehicle. Some mechanics call it the “brain” of your…
ECM vs PCM: What’s the Difference? (Updated) Whether you’re looking to tune your car or you want to understand why your car isn’t running right, you’ll have to learn about on-board computers. The terms ECM and PCM are often used interchangeably when referring to engine electronics, but there is a difference. Let’s talk about how…
Your car’s Engine Control Module (ECM) monitors all the sensors in the vehicle to make sure that the car’s systems are running as they’re supposed to. When conditions change, the ECM will automatically make adjustments in real time. That is why it is so important to recognize the symptoms of ECM failure. The ECM controls…
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