Ruiner46
Well-Known Member
As every one is saying, you need to get the codes that it is spitting out. Even the false ones as they can lead you down a path to find what is wrong. Since there are several codes, it's probably a wiring issue. I doubt your shop checked every wire and ground... it doesn't really sound like they know what they are doing. Ground wires are very important as they give a reference to compare wire voltages against. If you don't have a good ground, then the computer will not know what it is looking at since it doesn't have a "zero" volt signal to compare against. Many things are grounded to the engine and the engine is grounded to the chassis where the computer is grounded. If these connections aren't all solid, then the references will all vary causing problems.
There are OBD outputs for things like throttle position that you can look at in real time and see what the computer sees. There might even be different PIDs for pedal position vs throttle body position that you can get with an OBD2 scanner. I'm not sure exactly what is available on a normal scanner as I use HP Tuners. The computer throws these errors and goes into limp mode when it can't get the pedal position and throttle body blade position to match up in the way that it expects. If the throttle body is hooked up correctly, you should be able to turn the power on and measure the voltage coming out of one of the wires. Look around for TP1 or TP2 in a wiring diagram for the throttle body. As you move the throttle blades by hand, you should see the voltage change in a range from 0-5V. There is probably something similar you can do to the gas pedal output. A good shop should know how to do this basic troubleshooting on a drive-by-wire car.
There are OBD outputs for things like throttle position that you can look at in real time and see what the computer sees. There might even be different PIDs for pedal position vs throttle body position that you can get with an OBD2 scanner. I'm not sure exactly what is available on a normal scanner as I use HP Tuners. The computer throws these errors and goes into limp mode when it can't get the pedal position and throttle body blade position to match up in the way that it expects. If the throttle body is hooked up correctly, you should be able to turn the power on and measure the voltage coming out of one of the wires. Look around for TP1 or TP2 in a wiring diagram for the throttle body. As you move the throttle blades by hand, you should see the voltage change in a range from 0-5V. There is probably something similar you can do to the gas pedal output. A good shop should know how to do this basic troubleshooting on a drive-by-wire car.
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