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#2004 iac for a 2005 3.8 monity caro how to#

As you step off the accelerator pedal to slow down, the throttle plate closes and of course the TP sensor sends the info to the PCM as it returns to its base voltage signal, till the whole cycle begins again.

With this increasing voltage signal, the PCM knows it's time to inject more fuel, advance ignition timing, and a host of other things it has to do to keep your 3.8L GM equipped vehicle running optimally.

Once you throw the car in drive and accelerate the car, the throttle opens and the throttle position sensor immediately sends this change of the throttle angle as an INCREASING voltage signal to the PCM.

This value is what the PCM associates with a closed throttle.

Now, since the throttle is closed, the TPS (with power and Ground supplied) sends the PCM (Powertrain Control Module=Fuel Injection Computer) a DC voltage signal of about 0.5 to 0.8 Volt.

The fuel injection computer supplies 5 Volts and Ground to the throttle position sensor.

So here, in a nutshell, is how the throttle position sensor works when you crank and start your 3.8L GM V6 equipped vehicle: The throttle position sensor's job is to measure the angle of the throttle. It feels like all of a sudden someone cut the power out momentarily as you step on the gas to get the vehicle moving.

No power and/or hesitation as you accelerate the vehicle.

Now, this doesn't happen very often, but it happens.

Transmission does not shift out of second gear.

You know that it's not the price of gasoline that has you thinking that your 3.8L V6 equipped GM vehicle is costing you more at the pump.

TPS diagnostic trouble codes (DTCs) stored in the vehicle's computer's memory.

You'll have the check engine light on, for sure, on your instrument cluster and one of several of the following symptoms:

#2004 iac for a 2005 3.8 monity caro how to#

If this is the case in your vehicle, please read section: How To Calibrate the 1988-1992 TPS. TIP 2: Since the1988-1992 TP sensors are the adjustable type, these need to be calibrated to a certain output voltage (when they're replaced with a new one). The 1988-1992 TPS is the adjustable type and the TPS in the photo is the non-adjustable type used from 1993 onward. TIP 1: The 1988 thru' 1992 TP sensor does not look like the one in the photo, but you can still apply the testing info (in this article to it). NOTE: I've written several 'how to test' tutorials that are 3.8L GM specific, to see all GM 3.8L V6 test articles, go here: GM 3.8L Index Of Articles. You can find this tutorial in Spanish here: Cómo Probar El Sensor TPS (GM 3.8L) (at: ). TPS TEST 2: Testing The 5 Volt Reference Signal.How The Throttle Position Sensor Works.Less throttle opening equals higher IAC counts. More throttle valve opening equals lower IAC counts. If not, the adjustments may be tailored by adjusting the minimum air rate screw. With engine stabilized and in closed loop, the IAC motor values should be between nine to 12 counts. Shut off engine for 10 seconds and restart. Allow engine to run for at least 5 minutes. Restart the engine and again shift into drive or neutral. Turn the ignition key off for at least 5 seconds. Run the engine until the cooling fan has cycled on and off, or for a maximum of 10 minutes. Start the vehicle and place it in drive (A/T), or neutral (manual). Run the engine up to operating temperature and shut off.Īpply the parking brake. Turn off air conditioning controls and all other accessories. Re-connect the negative cable after this is complete. While The negative cable is dissconnected, pump the brake pedal a few times to clear out any voltage in the system. Under most circumstances, it will relearn after just driving the car for a while, but if your car continues to experience an abnormal idle, or you just don't want to wait for it to relearn on its own, you can try this procedure.ĭisconnect the Negative cable for a few minutes. If your battery has been disconnected for any reason, you may need to perform this procedure in order for the computer to relearn how to idle.