2003 E320 Throttle position sensor - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 01-10-2012, 11:56 PM Thread Starter
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2003 E320 Throttle position sensor

Does anyone have a picture or could explain to me where the throttle position sensor is located on a 03 E320? Please help!!!
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post #2 of 10 (permalink) Old 01-11-2012, 12:14 AM
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It's up near the brake master cylinder under the hood. The throttle cable connects to it. If it's not apparent to you, then have a friend step on the gas pedal (engine off) while you are looking in that area and you'll see it moving.

If you need a new one, parts geek has it for a good price and it is very easy to change.

Good luck.

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post #3 of 10 (permalink) Old 01-11-2012, 12:22 AM
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This is what the actual part looks like, but there is stuff on top of it so it's not exactly how it appears under the hood.

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post #4 of 10 (permalink) Old 01-11-2012, 01:08 AM Thread Starter
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It's up near the brake master cylinder under the hood. The throttle cable connects to it. If it's not apparent to you, then have a friend step on the gas pedal (engine off) while you are looking in that area and you'll see it moving.

If you need a new one, parts geek has it for a good price and it is very easy to change.

Good luck.
Thanks, big help this was driving me nutz for hours... i will attempt locating it in the morning.
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post #5 of 10 (permalink) Old 01-24-2012, 12:25 PM Thread Starter
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Thanks, big help this was driving me nutz for hours... i will attempt locating it in the morning.
I tried to locate the sensor under the hood but found out the sensor was in the gas pedal and replaced it but got the same problem code on the OBDII scanner P0120 and car still will not accelerate past idle speed. I then proceeded to replace the MAF sensor and got no better results. I checked both batteries and both started of at reading 12.6V and running the car batteries measure 14.3V. I also have the ESP light on saying defective. I am at a lost, can someone help with similar problems.
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post #6 of 10 (permalink) Old 01-24-2012, 01:47 PM
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Originally Posted by kanak5522 View Post
I tried to locate the sensor under the hood but found out the sensor was in the gas pedal and replaced it but got the same problem code on the OBDII scanner P0120 and car still will not accelerate past idle speed. I then proceeded to replace the MAF sensor and got no better results. I checked both batteries and both started of at reading 12.6V and running the car batteries measure 14.3V. I also have the ESP light on saying defective. I am at a lost, can someone help with similar problems.
Not sure if you did it but did you erase the codes using the scanner?

If you don't have the code scanner try the reset procedure:

- Turn the Key to the "on" position (the position right before you start your engine)
- Press and hold your gas pedal down for like 5 seconds
- Turn Key to "off" position (dont remove the key) and then release the gas pedal. Then wait at least 2, if not 3 minutes, for the system to reset.

Good luck
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post #7 of 10 (permalink) Old 01-24-2012, 02:26 PM Thread Starter
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Not sure if you did it but did you erase the codes using the scanner?

If you don't have the code scanner try the reset procedure:

- Turn the Key to the "on" position (the position right before you start your engine)
- Press and hold your gas pedal down for like 5 seconds
- Turn Key to "off" position (dont remove the key) and then release the gas pedal. Then wait at least 2, if not 3 minutes, for the system to reset.

Good luck
Thanks wii try that!
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post #8 of 10 (permalink) Old 01-24-2012, 06:49 PM
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What you have failed to recognize is that P0120 is a very elusive but specific fault for a pedal/throttle position sensor, but when properly diagnosed very rarely is the TPS the fault.

Then you wasted your money on replacing a MAF that has nothing to do directly with a P0120.

FYI there are three other sensors that all provide data to the ECU to accelerate the vehicle.

If you do not want to continue to change out non applicable parts, do yourself a favor and go to an inde and have him read the voltages of the sensors in the circuit and he/she or it will have your problem solved. Slow down and try to understand you cars systems before you decide to jump of the fence and ----- them all.
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post #9 of 10 (permalink) Old 01-24-2012, 08:32 PM Thread Starter
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What you have failed to recognize is that P0120 is a very elusive but specific fault for a pedal/throttle position sensor, but when properly diagnosed very rarely is the TPS the fault.

Then you wasted your money on replacing a MAF that has nothing to do directly with a P0120.

FYI there are three other sensors that all provide data to the ECU to accelerate the vehicle.

If you do not want to continue to change out non applicable parts, do yourself a favor and go to an inde and have him read the voltages of the sensors in the circuit and he/she or it will have your problem solved. Slow down and try to understand you cars systems before you decide to jump of the fence and ----- them all.
Already sent the car to the stealership for proper diagnostics, but if you don't mind me asking what three other sensors provide data to the ECU? Do you have a schematic?
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post #10 of 10 (permalink) Old 01-25-2012, 08:16 AM
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I do not have a function diagram for the acceleration circuit, however, the TPS voltage goes up when you accelerate and the ECU looks for a corresponding increase in voltage of the MAP repeat MAP(as you accelerate what happens to the manifold pressure??) The coolant temp sensor also provides the ECU with signals.

Regarding the MB drawing "ask the pasta guy" and or when you go to that dealer ask him(management) for the WIS document.
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