Referred to as the car's "brain", the powertrain control module (PCM) manages over 100 parts in a vehicle. The Dodge PCM is pretty much an onboard computer containing a transmission control unit and an engine control unit. The PCM is a vital component of modern vehicles which monitors and controls many operations including the following.
One of the numerous important functions that the PCM overlooks is maintaining proper fuel mixture (air-to-gas ratio). Wrong proportions of gas and air would cause the vehicle's engine to start up incorrectly, causing poor car performance. The PCM adjusts the fuel mixture based on conditions. As an example, the PCM increases fuel when the car is warming up, then changes the proportion to less fuel once the engine's warm enough.
Ignition timing is the pattern by which sparks generated by the vehicle's spark plug ignite the fuel mixture. Based on engine conditions, the ignition timing has to be adjusted to cycle slower or faster to always keep the car running efficiently. The PCM is tasked with carrying out these adjustments.
The Dodge PCM also takes part in maintaining your car's traction. For example, to enhance the auto's traction while exiting a corner, the PCM can reduce shift torque and engine throttle to the wheels on the outside of the turn or move power to the front wheels (for all-wheel-drive vehicles). Additionally, to boost your car's performance, the PCM can also increase transmission shift points.
The PCM of your Dodge car is also involved with engine idle speed. Idle speed refers to how fast the engine runs when the car is not moving. Engine idle speed is also based on many factors such as engine temperature or the load of other car systems to the engine. When your auto's air conditioning is in use, for example, the PCM increases idle speed to fit the additional load.
Through all kinds of sensors, the PCM can oversee system conditions like oil levels, emissions, and coolant temperatures. When these systems fall below normal specifications or when unsafe conditions happen, the PCM responds by activating the car's warning light. It also stores a code for the issue which auto professionals could recover to get essential info about the car's issue. For more relevant information, browse through wisegeek.com/what-is-a-powertrain-control-module.htm.
Reasons Why the PCM on Dodge Cars is Vital: A Peek