02 4.4 E53 Throttle body error codes
 

Hi all,

Driving up a hill, 70mph, suddenly 'ding' - engine failsafe mode, and lurching power. So I pull over, shut down - wait a minute, start again, drove ok for the next 30 minutes.

Later that night, started her up, and rough idle, and accelerator pedal did absolutely nothing.

Towed home - pulled with hand scanner codes: these are the only codes showing:

P0102 Mass or Volume Air Flow circuit low input
P1639 Throttle Value position control: throttle stuck permanently
P1636 Throttle Valve Control Circuit

I removed the MAF, cleaned it, no difference.
Pulled the Throttle Body, wasn't stuck, but cleaned it
When manually pushing the butterfly, engine RPM changes, but the accelerator pedal doesn't move the butterfly at all. Cleaned harness with electrical contact cleaner, still no difference.

I have DIS, and the codes I get there are:

RLS 80 - Control unit, frequency 15
DME 73 - Signal, Host film air mass flow sensor
DME C9 - DMTL heating
DME 67 -Function, monitoring, control unit
DME 84 - activation, throttle actuator
DME 83 - Function, throttle actuator jammed.

Does this sound proof-positive that I need to replace the throttle body? I'm in Mexico and kinda screwed, I have to order parts from the US, and it takes almost 2 weeks to get anything down here..

Thanks in advance...

Yep you're screwed. Shouldn't have tried pushing the throttle body manually.

The Butterfly wasn't moving even with the accelerator, so we pulled it, cleaned it, and then even after replacement, didn't move - so we tested moving it, and the revs did increase.

Check for continuity/wear/breaks in the wiring harness towards the rear of the engine before replacing the EML

Check for continuity where?
 

Can you tell me where to look, I don't know where to begin....

see video below at 2:36. Flexing from engine movement and heat/time can cause wire breakage, high resistance which will affect EML since it is closely monitored for fluctuations.

https://youtu.be/Hki4gy6q8Us?t=156

continuity check - complete - new throttle body didn't resolve
 

I found the pin outs for the throttle body my using
https://www.pss-autosoft.net/diagrams.php

And all 6 wires had continuity. So I was very hopeful the new throttle body would resolve, but it did not.

I don't know what to troubleshoot, I hate throwing money at parts that I don't need.

It’s possible the gas pedal module may have failed, it actually wouldn’t be the first time I’ve seen that happen.

It may have gotten water or debris behind the pedal and screwed the electronic module.

https://www.fcpeuro.com/products/bmw...iABEgJQFPD_BwE


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Pedal pin outs
 

I will be testing this tomorrow to see if I have continuity and voltage across the pins of the pedal, but I have a question:

There are two vac lines coming from the corrugated tube to the throttle body - the lower one is a very small tube, what is it for, and where is it going?

RealOEM.com - Online BMW Parts Catalog

link above is to the picture of the tube. the small tube on my E53 is broken, not sure what purpose it serves, and if this is the cause of my issue?

Can’t at the moment but this afternoon I’ll check mine, all I remember touching my TB is the harness and coolant lines. I’ll ping you back as quickly as I can verify.


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