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A PCM from a 1996 Chevrolet Beretta. A power-train control module, abbreviated PCM, is an automotive component, a control unit, used on motor vehicles. It is generally a combined controller consisting of the engine control unit (ECU) and the transmission control unit (TCU). On some cars, such as many Chryslers, there are multiple computers: the ...
In addition to the physical contact damage, there appears also a coating of carbon and other matter. This degradation drastically limits the overall operating life of a relay or contactor to a range of perhaps 100,000 operations, a level representing 1% or less than the mechanical life expectancy of the same device. [8]
An ECU from a Geo Storm. An electronic control unit (ECU), also known as an electronic control module (ECM), is an embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a car or other motor vehicle.
from 2nd battery and 12/24 V relay: 31 return to battery- or direct to ground 31a return to battery- 12/24 V relay 31b return to battery- or ground through switch 85d 31c return to battery- 12/24 V relay 31, 31a Electric motors; 32 return 31 33 main terminal (swap of 32 and 33 is possible) 30 33a limit 33b field 54e 33f 2. slow rpm: 33g 3. slow ...
The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A typical circuit consists of a ...
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A typical ETC system consists of three major components: (i) an accelerator pedal module (ideally with two or more independent sensors), (ii) a throttle valve that can be opened and closed by an electric motor (sometimes referred to as an electric or electronic throttle body (ETB)), and (iii) a powertrain or engine control module (PCM or ECM). [4]
After several months of investigating, the NHTSA said it found no evidence of a defect and no data was indicating any bad parts. [122] Christopher Santucci , an employee of Toyota's Washington, D.C. office and an NHTSA employee until he was hired by Toyota in 2003, testified that he was informed by the NHTSA in March 2004 about the pending ...