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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Apr-06-2018, 08:24:01 AM   #11
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by FrankJones View Post
Make sure your new TPS are genuine BMW parts. Donít do anything aftermarket when it comes to electronics. That was my issue.
The new TPS I installed is a genuine part.

I'm going to swap my throttle pedal with a friend's early next week. Will report back and advise if this solves my issue.
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Old Fri, Apr-06-2018, 03:27:08 PM   #12
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

I had the problem for 1 month.. i changed the actuator, the tps, the throttle pedal, check the DME and everything.. Problem solved when i've cleaned the connector of the TPS ... I've spent money, gasoline, time to test the car and it was something just so simple....
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Old Mon, Apr-09-2018, 04:50:08 AM   #13
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

I cleared the DME adaptations with BMW logger today. Took it for a drive. Drove fine for a bit but eventually I got the EML light. It did not go into limp mode though. Read the codes with BMW logger when I got home and this is what I got. I'm pretty stumped at the moment. I've gone through and sprayed down the front TPS connector and the maf connector with electrical contact cleaner. Cleaned the actual maf itself. I guess I could pull the intake and clean the connector to the TPS under there. I could also clean the connector to the pedal..

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Old Mon, Apr-09-2018, 02:45:21 PM   #14
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Are you able to view the voltage readings of the throttle pedal and throttle position sensors? If so, key on, engine off and slowly depress the throttle and watch the readings. If signals are missing, you may be looking at a loose connection (tighten terminals on connecter, dont just clean), high resistance in signal wire, or faulty DME. This is assuming the parts you have already replaced are fully functional. If there is a dead spot on either sensor readings, most likely a faulty sensor.
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Old Mon, Apr-09-2018, 09:21:07 PM   #15
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by CSLM3Wannabi View Post
Are you able to view the voltage readings of the throttle pedal and throttle position sensors? If so, key on, engine off and slowly depress the throttle and watch the readings. If signals are missing, you may be looking at a loose connection (tighten terminals on connecter, dont just clean), high resistance in signal wire, or faulty DME. This is assuming the parts you have already replaced are fully functional. If there is a dead spot on either sensor readings, most likely a faulty sensor.


How would I view the voltage readings?


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Old Mon, Apr-09-2018, 09:48:33 PM   #16
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by Pbj24 View Post
How would I view the voltage readings?


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The easy way is with a scan tool that can view live data from the DME. The old school way is with a volt meter and back probing the sensors.
If you don't have access to a diagnostic scanner or do not know how to use a volt meter to measure a potentiometer I would suggest trying to tighten the terminals at each connector as a first step.
Otherwise you will need to link up with someone who can help you.


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2005 BMW M3 ZCP Nardo Gray | ESS VT2-550 | Dinan Throttle Bodies | 6MT Swap | Active Autowerkes Headers + Section 1 w/ 100 cells | Miltek Section 2 and 3 | KW V2 w/ GC camber plates and Eibach Front and Rear Swaybars | Porsche 996 BBK upgrade w/ OEM ZCP rotors | Umnitza V4 Angel Eyes | Euro bumper w/ Morimoto led fogs | 1 piece Carbon Lip | VIS XTS Full carbon hood | SCZA Carbon Fiber CSL Trunk | Carbon Fiber CSL Diffuser | Square ZCP Wheels |
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Old Mon, Apr-09-2018, 10:40:34 PM   #17
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

I think bmwlogger (free to download on laptop) and a $10 OBD2->USB cable from Ebay or Amazon will do.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Tue, Apr-10-2018, 02:50:45 AM   #18
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by CSLM3Wannabi View Post
The easy way is with a scan tool that can view live data from the DME. The old school way is with a volt meter and back probing the sensors.
If you don't have access to a diagnostic scanner or do not know how to use a volt meter to measure a potentiometer I would suggest trying to tighten the terminals at each connector as a first step.
Otherwise you will need to link up with someone who can help you.


Sent from my iPhone using Tapatalk
Quote:
Originally Posted by mrgizmo04 View Post
I think bmwlogger (free to download on laptop) and a $10 OBD2->USB cable from Ebay or Amazon will do.

Sent from my SM-G950U using Tapatalk

I bought a cable from Amazon and downloaded BMW logger. I was able to read codes and clear dme adaptations but it was not letting me connect to view live data. It gives me a 'packet failure unable to connect to DME' error



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Old Tue, Apr-10-2018, 04:02:54 AM   #19
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by Pbj24 View Post
I bought a cable from Amazon and downloaded BMW logger. I was able to read codes and clear dme adaptations but it was not letting me connect to view live data. It gives me a 'packet failure unable to connect to DME' error



Sent from my iPhone using Tapatalk


Unfortunately I cannot help you with your error. It sounds like an installation error or it is only a partial install to allow minimal diagnostics.
I use a number of diagnostic scanners including Snap-on Zeus, Autoland Scientech, and ISTA-D.
I am still teaching myself these other BMW "tools"


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2005 BMW M3 ZCP Nardo Gray | ESS VT2-550 | Dinan Throttle Bodies | 6MT Swap | Active Autowerkes Headers + Section 1 w/ 100 cells | Miltek Section 2 and 3 | KW V2 w/ GC camber plates and Eibach Front and Rear Swaybars | Porsche 996 BBK upgrade w/ OEM ZCP rotors | Umnitza V4 Angel Eyes | Euro bumper w/ Morimoto led fogs | 1 piece Carbon Lip | VIS XTS Full carbon hood | SCZA Carbon Fiber CSL Trunk | Carbon Fiber CSL Diffuser | Square ZCP Wheels |
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Old Tue, Apr-10-2018, 04:11:05 AM   #20
mrgizmo04
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Pbj24 View Post
I bought a cable from Amazon and downloaded BMW logger. I was able to read codes and clear dme adaptations but it was not letting me connect to view live data. It gives me a 'packet failure unable to connect to DME' error



Sent from my iPhone using Tapatalk
Try reinstalling and car obviously has to be running to be able to connect.

Sent from my SM-G950U using Tapatalk
__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Discussing Throttle position problems, codes P0121 and P1637, new throttle actuator + sensors an in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)