pedal, position, sensor - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 01-09-2007, 12:20 PM Thread Starter
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pedal, position, sensor

Does any one have a picture of one? Or know how to repair one?

Currently my SLK 320 on a cold morning the throttle does not respond correctly. after a few starts and some driving around for a while it will start working for the rest of the day.

I pulled up the codes one day and it said PO 120 TPS Pedal Position Sensor. I can go several days without it happening then other times it can happen a few days in a row. The colder that it gets out side the worse this problem gets.

Short of holding out for global warming does any one have any ideas how to fix it. I was thinking about once I find it hitting it with some contact cleaner.

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post #2 of 7 (permalink) Old 01-09-2007, 06:59 PM
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Quote:
Originally Posted by Chris A
Does any one have a picture of one? Or know how to repair one?

Currently my SLK 320 on a cold morning the throttle does not respond correctly. after a few starts and some driving around for a while it will start working for the rest of the day.

I pulled up the codes one day and it said PO 120 TPS Pedal Position Sensor. I can go several days without it happening then other times it can happen a few days in a row. The colder that it gets out side the worse this problem gets.

Short of holding out for global warming does any one have any ideas how to fix it. I was thinking about once I find it hitting it with some contact cleaner.
Hi, Chris.

Unless someone here knows it's exact location on your particular model, it might be worth calling the dealer to ask where it is; either your service writer would know or he should be able to find a mechanic who does. Typically these are either right near the pedal or sometimes along the intake path. Sometimes they're at the end of the cable that is actuated by you stepping on the accelerator pedal (and then you need to follow the cable to find it). In any event the TPS is part of the drive-by-wire system. When you "step on the gas" all you really do is actuate a sensor (the TPS) that tells the engine's computer how much and how hard you stepped on the pedal (or let off it). Then the computer runs the numbers and actually actuates the throttle opening for you, as well as downshifting the transmission if necessary, etc.

Depending upon the design, you may actually not be able to hit it with contact cleaner, at least not in any way that would help. But you'll know that once you are able to locate it. The fact that it eases up when warm suggests that it may be dirty or sticky, so a cleaner may indeed help. It also tends to suggest it's under the hood, which is a place that is more likely to get dirty than under the dash.

Good luck and enjoy the ride,
Greg

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post #3 of 7 (permalink) Old 01-09-2007, 07:25 PM
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On my E model the sensor is in the enginey buy between fuse box and brake booster. I am getting similiar error occacionaly, but it doesn't seem to affect the engine work and clears itself after few days.
My worry is, that the thing is not fixable.
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post #4 of 7 (permalink) Old 01-09-2007, 08:15 PM
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On my E model the sensor is in the engine bay between fuse box and brake booster. I am getting similiar error occacionaly, but it doesn't seem to affect the engine work and clears itself after few days.
My worry is, that the thing is not fixable.
Yeah, and I was unable to find it on line (for the E or his slick) so I could post a picture of it, sometimes knowing what it looks like helps find it. At any rate, that suggests it's a dealer item...and probably a very dear one, too.

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post #5 of 7 (permalink) Old 01-09-2007, 09:03 PM
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It is rounded, black thing, about 2" dia x 3" with throttle cable and wires coming to it.
I have the problem with E300 which is my spare car and still consider project, so I am not in big hurry. I hope the pick up your part junkyard might have those models, so I can get it very cheap. So far I am making "shopping" list. Coolant circulating pump is another part on it.
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post #6 of 7 (permalink) Old 01-09-2007, 11:24 PM
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This is how it looks on EPC for the W210:
Ê*ò*ëîã

This is for the W211:
Ê*ò*ëîã
It is not using a wire any more, the sensor is integrated to the pedal.

This is for the SLK 320 170.465:
Ê*ò*ëîã

Looks like the W211 stuff but the parts list did not mention the position sensor, go figure.
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post #7 of 7 (permalink) Old 01-10-2007, 10:14 AM Thread Starter
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After reading a few replies and a few mails I found that it was located on the gas pedal itself and I get to replace the whole assembly in order to fix it.

Thanks a lot for your help at least now I know where it is and what it looks like.

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