Question about 2005 Ford Expedition
What do the trouble codes P2104 and P2112 mean?
As if a simple cable linking the gas pedal to the throttle plate wasn’t good enough, engineers have now made that design complicated too. Why do engineers do these things to us? That expensive throttle body can’t cost less than a cheap little throttle cable; or can it? Are there any advantages to the manufacturer or the consumer with such a design? Let’s examine the system and see.
In the Ford ETC system, the PCM directly controls the position of the throttle plate by use of a DC motor. A redesigned throttle body, coupled with a redesigned PCM, a redesigned throttle position sensor (has 2 position sensors inside of it), and the addition of an accelerator pedal position sensor (APPS) make up the ETC system directly. The ETC system replaces the throttle cable and brackets, IAC valve and it’s wiring, cruise control servo, plus some wiring for the cruise system as well. The only part of the ETC system that is truly new (excluding redesigning) to the gasoline vehicle is the APPS, and it has been in service on the DI diesel for years. So with that considered, what appears to be more complicated on the surface, is actually less elaborate when viewing the entire scope. It might cost less to build too.
The principle reason for using the ETC system is for improved drivability through its torque based strategies, which take better advantage of VCT and transmission shift strategies. There are however, other benefits. It allows the PCM to limit vehicle speed and engine rev through throttle control, rather than inducing misfires. Also, adding factory cruise control to a vehicle that wasn’t originally equipped with cruise becomes a snap; Simply replace the steering wheel (in some cases replace the clock spring too) and “tell” the PCM it has cruise, with a capable scan tool. Nice huh?
The ETC system also helps pave the way for future design changes to the vehicle’s passenger compartment as well; such as the consumer being able to slide the vehicle controls to the opposite side of the dash. ETC also makes it possible for the traditional throttle pedal to be eliminated all together by replacing it with hand controls on the steering wheel. That feature holds obvious potential for dealer or factory equipped handicap driver applications.
Posted on Jan 25, 2009
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Here is a breakdown of what each digit of the code means:
First Character - System The first character identifies identifies the system related to the trouble code.
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