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Hello all, I have been fighting this error code for a while now. Even though the code still registers on my scan tool at all times, the check engine light is never on and is never in limp mode. When I put the car down to about 90% full throttle, the car acts perfectly fine. The second the pedal goes to the floor it revs to 3K, then goes into limp mode and the check engine light goes on. I inspected the connectors between the TPS and all of the points are in great condition. Any advice would be appreciated! I drive a 02' E430 4Matic.
Hello all, I have been fighting this error code for a while now. Even though the code still registers on my scan tool at all times, the check engine light is never on and is never in limp mode. When I put the car down to about 90% full throttle, the car acts perfectly fine. The second the pedal goes to the floor it revs to 3K, then goes into limp mode and the check engine light goes on. I inspected the connectors between the TPS and all of the points are in great condition. Any advice would be appreciated! I drive a 02' E430 4Matic.
Hey all, once it stops raining im gonna clean the ground connection to the body by the TPS, its very oxidized and corroded. Going back to the actual P0123 code, it states "P0123 Throttle/Petal Position Sensor/Switch A Circuit High Input." By saying that it is a high Input, that would mean that the problem cannot be the throttle body since the throttle position sensor input would be the cable connected to the gas pedal. So since the connection between the TPS and the actual cable seemed to be in very good shape, it is most likely either the TPS or heavy oxidation on the ground cable. I decided to have my scan tool the relative throttle position (in percent) and it registered some very large spikes, which is in the photo i also included. Any advice on the this would be greatly appreciated, thank you!
Please don't try to baffle us with graphics that have no relationship to the fault.
Additionally your understanding of "high and low" input is very misleading especially when most folks have troubles understanding a window switch circuit.-------simply google the question and you will be amazed with what you and others can learn and be able to eat more leaves higher in the tree.
From what I read from the repair manual, the throttle position sensor has two sensors, one as a backup that is 2.4V and the main which is 5V. If the main 5V sensor fails, the ECM uses the 2.4V with up to a 60% throttle opening and there is a delay with the throttle opening. The EPC light only turns on when both sensors do not work. Since the EPC light hasn't ever turned on, then at least one of the two sensors are operating normally. But the symptoms of the switch to the 2.4V line is the same symptoms that I get whenever I go WOT normally. Tomorrow I'll get rid of the corrosion of the ground to body connection, see if that helps anything. Any tips on reading voltage from the TPS would be greatly appreciated.
09-14-2019, 09:46 AM
