In some applications, critical data like barometric pressure or altitude might be stored in an adaptive memory built into the PCM so the engine will immediately start. When the ignition is turned on, the PCM uses ambient temperature, coolant temperature, and barometric pressure sensor inputs to determine the correct air/fuel mixture ratio for starting the engine.
Pcmscan wont accept key code code#
As with any computer, the PCM uses a binary code to execute complicated math formulas programmed into its read-only memory. In reality, an automotive computer or powertrain control module (PCM) is an information processor that turns electrical inputs from system sensors into electrical outputs into system actuators.
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To many amateur mechanics, an automotive computer is a “black box” that mysteriously controls all of the engine functions. At that point, my jobber referred his customer and his problem to me. He then decides the fuel pump is defective and wants the jobber to warranty the fuel pump. His next step is to remove and inspect the new fuel pump. After replacing the battery, he still can’t get the Jeep to start. In frustration, he turns his commercial-grade battery charger on a high-boost charging setting with no result. So the contractor places the battery on a slow charge and returns at lunch time only to find that the battery is still dead. A few days after the fuel pump replacement, the wife discovered that her Jeep had a dead battery.