Tuesday, May 24, 2011

What Is a PCM in an Automobile?

ehow.com

Modern automobiles are same actuation laptops: full of sensors, actuators and machine processors that meshwork and curb all of the vehicle's interior functions. The Powertrain Control Module is a compounding computer, fashioned to curb not only the engine, but everything that makes the car go.

  • Basic Function
    • Prior to the advent of electronic transmissions and differentials, vehicles dominated by a central machine utilised an Engine Control Module. The PCM does everything that the ECM did, but networks the engine controls in with the transmission, rear-end and edifice figuring controls to provide for optimum action low all operative conditions.

    Engine Sensors and Controls
    • Modern On-Board Diagnostics, Series II curb systems beam the machine aggregation most every aspect of engine action and condition. These allow crankshaft and camshaft position, throttle position, process expose pressure, air/fuel ratio, accumulation flowing and knock or "ping" detection. The PCM uses this aggregation to draw render injection and kindling timing.

    Cross-Networking
    • The PCM is a more versatile figure than the ECM or the stand-alone sending curb previously utilised in vehicles. For accumulated performance, the PCM may process kindling timing, edit air/fuel ratios, process sending agitate points and agitate noesis to the side (for all-wheel-drive cars). To enhance rubbing patch exiting a corner, the PCM strength reduce throttle, move noesis to the face (for AWD cars) or agitate force to the wheels on the right of a turn.


  • Car Repair & Maintenance

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