Need a Little Help, Throttle Actuator is not getting power from DME

M-Cast · 06-10-2018, 04:35 PM

Guys, I am at the finish line with getting this car back on the road and hit a snag.

If you have followed any of my threads, we have dropped a fully built 3.4-liter stroker engine, with CSL airbox into my coupe and have hit a snag at the finish line.

Problem: The engine is starting, but we cannot find out what is causing the DME to not send power to the throttle actuator.

Error Codes:

2D09
2CFB
2CFA

Checked the angle of the throttle bodies and it only shows 90 degrees, which is strange as when we hooked it up to the Z3 M Coupe with an S54, it provides us with a lot more information. The Z4 M DME is different as it is an S54 with an e90 DME, so nothing from the e46 is the same.

What we have done so far:

1. Checked all the grounds.
2. Checked and tested all the fuses.
3. Tested all TP Sensors and swapped them out to confirm 1 & 2, there are 3 wires in the TPS 2 which and a lavender wire which is where we can narrow things down too.
4. Double checked and Tested all wiring up to the DME.
5. Sent the DME out to verify there was no damage before purchasing a new one. This is what I am trying to avoid.

Anyone who has had any experience with this it would be greatly appreciated.

Thanks

racerbruce · 06-10-2018, 09:35 PM

This is WAY above my pay grade....sorry if I missed this, but did you swap the DME with another? If no, perhaps a loaner DME to try??

StickMon · 06-10-2018, 11:28 PM

According to the booklet for my Peake Research code reader:
2D09 = "Throttle Valve" (I've had this due to a bad TPS)
2CFB = "Throttle Valve Adaptation Value" (Have you reset the adaptation?).
2CFA = "Throttle Valve Potentiometer 2" (This is the hard one to get to on the back of the throttle rail, under the air box).

My guess would be a wiring problem on TPS #2. Just a guess.

M-Cast · 06-11-2018, 04:16 AM

Quote:

Originally Posted by racerbruce

This is WAY above my pay grade....sorry if I missed this, but did you swap the DME with another? If no, perhaps a loaner DME to try??

You cannot swap out these because nobody has figured out how to delete the EWS on the E85/E86 yet.

I did find some guys who say they can clone the MSS70 which is what I have and to run the MSV70 (e90 DME) hardware. I have reached out to them over the weekend to hopefully find an answer.

https://www.kasselperformance.com/pr...90-dme-repair/

M-Cast · 06-11-2018, 04:28 AM

Quote:

Originally Posted by StickMon

According to the booklet for my Peake Research code reader:
2D09 = "Throttle Valve" (I've had this due to a bad TPS)
2CFB = "Throttle Valve Adaptation Value" (Have you reset the adaptation?).
2CFA = "Throttle Valve Potentiometer 2" (This is the hard one to get to on the back of the throttle rail, under the air box).

My guess would be a wiring problem on TPS #2. Just a guess.

That is what we thought first, but we have honed out every line back to the DME and all are working properly at full voltage. In TPS 2 there are 3 wires, brown is the ground, red, and violet which seems to be what is causing the problem at the ECU as it is not sending power to the TPS #2.

We have the airbox out, but yes we have tried both of the other suggestions. Even replacing them and testing them on another car.

Hopefully, these other guys at Kessler can shed some light. Otherwise, I am going to have to just purchase another DME which is going to drive me crazy if that is not the fix.

StickMon · 06-11-2018, 10:28 PM

WDS says TPS2 is brown, violet, and red/green.
Violet appears to be the wiper, so red/green is the power.
Color key here.

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3002 tii · 06-11-2018, 10:49 PM

Quote:

Originally Posted by M-Cast

You cannot swap out these because nobody has figured out how to delete the EWS on the E85/E86 yet.

I did find some guys who say they can clone the MSS70 which is what I have and to run the MSV70 (e90 DME) hardware. I have reached out to them over the weekend to hopefully find an answer.

https://www.kasselperformance.com/pr...90-dme-repair/

Maybe Hass can get you an answer sooner:
http://www.zpost.com/forums/showpost...72&postcount=7

pokeybritches · 06-12-2018, 01:24 AM

I'm more familiar with the Porsche e-throttle. Have you bench tested the throttle body to confirm voltage range?

**There are a lot of warnings out there regarding manually opening and closing the throttle (like lost fingers or motor damage), so test at your own risk.**

On my 987.2, one TPS goes from 0-5V, and the other goes from 5-0V. The sum of both always equals 5V. If there's a large error, the ECU will likely go into limp mode, closing the TB to a "high idle" as to not shut down the car completely and lose brake boosting, power steering, etc. If your throttle plate is stuck at 90 degrees (and I'm assuming almost fully closed), then this would equate to the high idle limp mode.

FYI, some cars have one sensor with a range of 0-5V and the other is 0-2.5V.

You can check the resistance of each TPS with a digital multimeter. The TPS circuit is essentially a voltage divider circuit, so DON'T test the resistance of the source voltage to ground. You want to test the resistance between the output and ground, or the output and source. Ensure the TB is not powered, and then *CAREFULLY* (and this goes back to my disclaimer above) sweep the range of throttle positions by manually moving the throttle plate (I wouldn't recommend using my fingers). The resistance should change with position. If all is correct, then it's likely a wiring issue.

Based on StickMon's info above, red/green is the source voltage (powered by the ECU), and the violet is your TPS output back to the ECU. Is the red/green wire showing +5V?

One other thing to check is the voltage drop across your wiring, not just the source voltage with the TPS unplugged or continuity of the wires.

06-10-2018, 04:35 PM	#1
M-Cast Lieutenant 708 Rep 506 Posts Drives: 2007 M Coupe Join Date: Nov 2015 Location: Atlanta GA iTrader: (4) Garage List 2007 E86 Coupe [0.00] 2006 Z4 3.0si Coupe [6.00] 2002 330 CI [0.00] 2018 BMW 240M [0.00] 2007 M Coupe [10.00]	Need a Little Help, Throttle Actuator is not getting power from DME Guys, I am at the finish line with getting this car back on the road and hit a snag. If you have followed any of my threads, we have dropped a fully built 3.4-liter stroker engine, with CSL airbox into my coupe and have hit a snag at the finish line. Problem: The engine is starting, but we cannot find out what is causing the DME to not send power to the throttle actuator. Error Codes: 2D09 2CFB 2CFA Checked the angle of the throttle bodies and it only shows 90 degrees, which is strange as when we hooked it up to the Z3 M Coupe with an S54, it provides us with a lot more information. The Z4 M DME is different as it is an S54 with an e90 DME, so nothing from the e46 is the same. What we have done so far: 1. Checked all the grounds. 2. Checked and tested all the fuses. 3. Tested all TP Sensors and swapped them out to confirm 1 & 2, there are 3 wires in the TPS 2 which and a lavender wire which is where we can narrow things down too. 4. Double checked and Tested all wiring up to the DME. 5. Sent the DME out to verify there was no damage before purchasing a new one. This is what I am trying to avoid. Anyone who has had any experience with this it would be greatly appreciated. Thanks
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06-10-2018, 09:35 PM	#2
racerbruce Brigadier General 3852 Rep 3,004 Posts Drives: 21 X3 & 13 335is E93 Join Date: Dec 2009 Location: Seattle iTrader: (1)	This is WAY above my pay grade....sorry if I missed this, but did you swap the DME with another? If no, perhaps a loaner DME to try?? __________________ Racerbruce
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06-10-2018, 11:28 PM	#3
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	According to the booklet for my Peake Research code reader: 2D09 = "Throttle Valve" (I've had this due to a bad TPS) 2CFB = "Throttle Valve Adaptation Value" (Have you reset the adaptation?). 2CFA = "Throttle Valve Potentiometer 2" (This is the hard one to get to on the back of the throttle rail, under the air box). My guess would be a wiring problem on TPS #2. Just a guess. __________________ Warning: May contain traces of nuts.
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06-11-2018, 10:28 PM	#6
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	WDS says TPS2 is brown, violet, and red/green. Violet appears to be the wiper, so red/green is the power. Color key here. __________________ Warning: May contain traces of nuts.
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06-12-2018, 01:24 AM	#8
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	I'm more familiar with the Porsche e-throttle. Have you bench tested the throttle body to confirm voltage range? There are a lot of warnings out there regarding manually opening and closing the throttle (like lost fingers or motor damage), so test at your own risk. On my 987.2, one TPS goes from 0-5V, and the other goes from 5-0V. The sum of both always equals 5V. If there's a large error, the ECU will likely go into limp mode, closing the TB to a "high idle" as to not shut down the car completely and lose brake boosting, power steering, etc. If your throttle plate is stuck at 90 degrees (and I'm assuming almost fully closed), then this would equate to the high idle limp mode. FYI, some cars have one sensor with a range of 0-5V and the other is 0-2.5V. You can check the resistance of each TPS with a digital multimeter. The TPS circuit is essentially a voltage divider circuit, so DON'T test the resistance of the source voltage to ground. You want to test the resistance between the output and ground, or the output and source. Ensure the TB is not powered, and then CAREFULLY (and this goes back to my disclaimer above) sweep the range of throttle positions by manually moving the throttle plate (I wouldn't recommend using my fingers). The resistance should change with position. If all is correct, then it's likely a wiring issue. Based on StickMon's info above, red/green is the source voltage (powered by the ECU), and the violet is your TPS output back to the ECU. Is the red/green wire showing +5V? One other thing to check is the voltage drop across your wiring, not just the source voltage with the TPS unplugged or continuity of the wires. __________________ VF Engineering Z4 3.0i, ESS Z4M, G-Power Z4M, 996 Turbo Last edited by pokeybritches; 06-12-2018 at 02:05 AM..
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