Is there a difference between a throttle body and a idler control module with sensors?
It's a Honda Civic LX 1997 and on red lights, the speed of the motor fluctuates like it would almost stop. The garage told me code 505 was related to idler control module with sensors and the auto part wants to sell me a throttle body. I don't know much about cars and I am confused ,please help.
Go to the Honda dealer for a second opinion.
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How an Engine Control Unit Affects Performance
The Engine Control Unit, sometimes referred to as a PCM (Power-train Control Module), ECM (Engine Control Module), DME (Digital Motor Electronics), or DDE (Digital Diesel Electronics) is a device that manages fuel volume, ignition timing and various other elements required to keep a modern engine running. The Engine Control Unit reads values from multidimensional performance maps (e.g. Lookup tables), using input values such as engine speed which are calculated with readings from a variety of sensor devices monitoring engine activity. In the past, air/fuel mixture, ignition timing and idle speed were regulated directly by mechanical sensors and actuators, unlike today's engines which are almost entirely computer controlled.
Air/Fuel Mixture
In engines utilizing fuel injection systems, the Engine Control Unit (ECU) determines the quantity of fuel to inject based on several different parameters. When the throttle is pressed down, the throttle body is opened allowing more air to flow into the engine, which results in the ECU reacting by injecting more fuel based upon the increased airflow. N the case of an engine which hasn't been warmed up, the ECU will inject slightly more fuel causing the engine to run rich until it has properly warmed up.
Ignition Timing
Engines require a spark to start the combustion process within the combustion chamber. The ECU can minutely adjust the timing of the spark to optimize both power output and fuel economy, and if it detects any engine knock and decides it is a direct symptom of the ignition timing settings, it will adjust accordingly to prevent it.
Regulating Idle Speed
In the majority of engine systems, the ECU is also equipped to maintain control over idle speed. A crankshaft position sensor monitors the engine RPM, and this sensor plays a significant role in all aspects of engine timing for fuel injection, spark events and valve timing. Direct control over idle speed is handled by a programmable throttle stop or idle air bypass stepper motor. In order to be effective, the load at idle needs to be accurately anticipated for proper control. Variations in engine load such as HVAC systems, power steering, power brakes and the state of the electrical systems all have to be taken into account.
Variable Valve Timing
Engines with Variable Valve Timing are also directly controlled by the ECU, which manages the time in the engine cycle at which the valves open. At higher speeds, the valves are normally opened slightly sooner, which serves to optimize airflow into the cylinders.
About the Author
Carmine Cupani is the owner of Carmine's Import Service in Kernersville, NC, specializing in European import vehicle maintenance and repair, including full vehicle computer diagnostics by factory certified technicians.
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