When the HVAC controller loses power, it forgets what position the doors were in. Those doors are operated by electric motors. Most climate control systems vary air temperature by opening and closing baffles and doors to regulate how much air passes over the heater core or evaporator coil. On some makes and models you need a high-end scan tool to reset The FMEM stores an adaptive “fail-safe” strategy that substitutes known-good values for sensor data that’s missing. Ford Failure Mode Effect Management (FMEM) resets.If you have smog/emissions testing in your area, a “readiness monitors not ready” situation will be an automatic fail. The computer resets all its readiness monitors.Your engine may run terribly and the transmission may not shift properly until it relearns everything. When you disconnect the battery without providing a backup, the computer defaults to the factory setting and the learning has to start all over again. These are all the adjustments the computer has made to keep your engine and transmission operating smoothly as it ages. The PCM/ECM/ECU loses its adaptive “keep-alive” memory.How do you reset the steering angle? Yup, an expensive scan tool.ĭisconnecting the old battery without backup power also causes these other problems:
As soon as you drive the car, the computer will detect a steering angle sensor problem and set the check engine light. If you disconnect the battery without providing backup power first, whichever position the wheels are in when you disconnected the power will be the new “straight-ahead” when you connect the new battery. Stability control systems compare inputs from the steering angle sensor to the readings from the yaw sensor to figure out if your 2002 Mazda Protegé is in a skid situation. Stability control relearn is also a big problem Still others require a factory scan tool relearn. But other car makers have a complicated Hokey-Pokey procedure that requires multiple brake pedal applications, along with several key on/off cycles. In those 2002 Mazda Protegé s, all you have to do is turn the key to ON and leave it there for 30-secs. Some car makers have a self learning throttle body re-learn procedure. In order to open and close properly, the computer must know when the throttle plate is fully closed. The gas pedal sends electronic signals to the PCM which then tells the throttle body how far to open
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