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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-28-2010, 08:27 AM   #1
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TPS testing


Any one out there with a Bentley manual or knowledge on the TPS sensors for the M54b30, could explain how to test them. I found some info on the S54 engine but I was told not to use any of it for the trouble shooting. Adam (pei330ci) explained to me how the sensors work
There are most certainly 2 TPS signals, it is a failsafe for the ECU if one goes bad. The same is true of the throttle pedal, it has 2 sensors in it.

What's really cool is that the signals are different, and the "check" is designed around some simple math.

One signal rises in voltage from 0% to 100%, and the other falls in voltage from 0% to 100%. (0-4.5v, and 4.5v to 0v) When the 2 are summed via the ECU, they should always equal 4.5vs no mater the throttle position.
But now I need a way to test which one of my sensors went bad so I can replace it.

Thank you,
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Old 03-02-2010, 05:07 PM   #2
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to the top
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Old 06-29-2010, 12:05 AM   #3
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I was looking for this info too. Any body can help in this.
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Old 06-30-2010, 09:46 PM   #4
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if the tps went bad your going to need replace the entire throttle body since the tps is integrated in it on the m54 engine but idk how it is on the 328 engine.
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Old 07-11-2010, 07:24 AM   #5
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Maybe this will help - I found this in a PDF file on the internet-

The accelerator pedal sensor is similar to the PWG used on the ME 7.2 system. It is integrated
into the accelerator pedal housing. Two hall sensors are used to provide the driver’s
input request for power.
The hall sensors receive power (5 volts) and ground from the MS 43 control module and
produce linear voltage signals as the pedal is pressed from LL to VL.
PWG SENSOR 1 = 0.5 to 4.5 V
PWG SENSOR 2 = 0.5 to 2.0 V
The MS 43 control module uses the
signal from sensor 1 as the driver’s
request and the signal from sensor 2
as plausibility checking.

• As a redundant safety feature the PWG provides two separate signals from two integral
angle hall sensors (HS #1 and HS #2) representing the driver’s request for throttle activation.
• If the monitored PWG signals are not plausible, MS 43.0 will only use the lower of the
two signals as the driver’s pedal request input providing failsafe operation. Throttle
response will be slower and maximum throttle position will be reduced.
• When in PWG failsafe operation, MS 43.0 sets the EDK throttle plate and injection time
to idle (LL) whenever the brake pedal is depressed.
• When the system is in PWG failsafe operation, the instrument cluster matrix display will
post “Engine Emergency Program” and PWG specific fault(s) will be stored in memory.
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Most Dealers offer a parts discount, BMP Design 10% off
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