Cuty's 735 is needing help / advise

[Cutey]

LincolnMaster80,

Thanks for the continued help, it is very much appreciated.

I will ask Shogun about the result of a kickdown switch being stuck in active mode.

I had someone else step on the switch while I felt it and i detected zero movement -


I did not make it to see Cupcake today, but I will be there early in the morning to beat the heat -


Everybody says to take the car to a shop, but I really do not have one that I trust -

It least if I have to take it somewhere, I want to understand what is happening so that I can defend myself and not be a victim -

I also plan to have a second Bimmer soon and I figure that I should get to understand how they work. And of course the best deals are likely those that have an issue -


Four things that I keep thinking about are:

*Magnetic Valve ( Shift ) Solenoids ( MV )
All magnetic valves (except THM R-1 to 12/95) are supplied power from an internal relay
located in the TCM. The magnetic valves are switched on and off by final stage transistors in the TCM. During failsafe operation, power to all MV’s is switched off by the internal relay.




*Emergency Program
When a malfunction occurs within the transmission, the Emergency program (failsafe mode) will be initiated. The Emergency Program will prevent unintended gear engagement and ensure driver safety. The following will occur during Failsafe Operation:
• All shift solenoids are de-energized via TCM internal relay.[/color][/color][/b]
• The pressure regulation solenoid is de-energized resulting in maximum line pressure.
• The Torque Converter Clutch is de-activated. ( Interesting )
• The Reverse Lockout function is cancelled.
• Shift lock solenoid is de-energized.

[lincolnmaster80]

Well, with the technical part of the shift solenoids and such, I will let the guru's guide you on that one. I'm not a total newb when it comes to these transmissions, but I certainly wouldn't want to steer you in the wrong direction, if you understand where I'm coming from. (In other words, I don't know everything).

I am intregued by the kickdown button, though... Have a read through the following thread on RoadFly:
http://forum.roadfly.com/threads/125......please-help

The more I think about it, the more I feel it's probably not a good thing that the kickdown switch is stuck on...

[Cutey]

LincolnMaster80,

This was Shogun's response:

Quote:

I can only tell you what the Bentley Manual says

throttle position switch TPS, testing and adjusting (M30 engine, w/o EML

On the M30 w/o EML a throttle position switch provides an idle and full throttle position signal to the ECM.
The idle position signal is used mainly for activation of the idle speed control valve. The full throttle position signal is used for AC compressor cutouts and fuel enrichment.

The TPS is mounted to the side of the throttle housing . The switch can be checked with the thottle housing installed.

Note: on 735 models with traction control (ASC), the EML control module provides the throttle position signal to the ECM.

Disconnect harness from throttle switch.
With ignition on, check the supply voltage (VDC) to switch. If voltage is not present, check wiring from ECM.

TPS terminals M30

automatic transmission
idle position 4 and 6
full throttle position 4 and 5
Check the continuity at switch terminals with throttle at idle and at full open positions. Adjust or replace switch if any faults are found.

>>>>>>>>>>>>>>>>>>>>>>>>>

[Cutey]

If I get a OBD-1 and run a fault code diagnostic reading, will I find evidence of what my problem is ?

I am finding that checking each component individually is very time consuming.

I do find it all interesting and I do wish to continue the learning experience, but I also do need to get Cupcake back on the road again.

I may need to buy a second car at my current rate of exploring,

[lincolnmaster80]

A scan would definately help. Keep in mind, the scanner you're looking for has to have the BMW specific OBD cables.

[lincolnmaster80]

Here is the exerpt from the Bently's manual that shogun posted, just to give you that picture reference. If you do not see this, then you have a different setup (see the pics after "Different Setup")







DIFFERENT SETUP

[Cutey]

I had been asking around for one, but the reply has been that they did not have the BMW cables -

I found this on DealsExtreme.com -

It will take over a week to get and my computer doesn't have the old (RS232 PC Interface plug )

Carsoft 6.5 Vehicle Diagnostic Tools with Software CD for BMW (RS232 PC Interface)
Price: $56.93


- Manufacturer's product descriptions:
- MCU controlled Interface for Carsoft 6.5 which is compatible with the original interface.
- Fully digital line switchings and MCU controlled service reset timing.
- Main Functions
- Digital total test: It gives you a complete idea of the overall condition of the car.
- Digital single test: It gives you detailed information about the appropriate control unit.
- Stored errors will be shown in a written report. This report has a short info-text which help you to eliminate the error.
- Special functions for some models: Including service interval reset, component activation, live data, LCM reading, sync. EWS and ECU, adaptation values, and coding.
- Applications list
- E30 - 3 Series
- DME ALL
- DDE ALL
- AB From 1998
- BC/MID ALL
- DWA ALL
- E36 C 3 Series
- KOMBI Except kompakt
- AB ALL
- ABS ALL
- ASC ALL
- ZKE From 1994
- ZVM Till 1994
- HKL ALL
- EGS ALL
- EWS ALL
- E46 C 3 Series
- KOMBI ALL
- DSC ALL
- ZKE ALL
- LCM ALL
- CCM ALL
- PDC ALL
- CVM ALL
- Z3
- E34 C 5 Series
- KOMBI From 02/98
- ABS From 1992
- ASC From 1992
- E39 C 5 Series
- ZVM ALL
- E53 C X5
- E32 C 7 Series ... E38, E31, E52


Specifications
Item: Carsoft 6.5 Vehicle Diagnostic Tools with Software CD for BMW (RS232 PC Interface)
Dimensions: 4.41 in x 2.52 in x 0.91 in
Weight: 20.64 oz

[lincolnmaster80]

That is the cheapest scanner avaliable. However, you need a laptop with a serial port (RS232 plug) most commonly found on laptops that have Windows XP installed (usually early 2000's).

You can get USB-to-Serial adaptors (the cheap ones I found didn't work well, at least on Windows Vista). But what I ended up getting is an ExpressCard adaptor. I'll go find my scanner hardware and upload pics.

[lincolnmaster80]

Here is the complete CarSoft 6.5 kit you get from DealExtreme (left out is the software disk that comes with it). It comes with both the OBD and OBD-II cables:


This is the end you will need to plug into your OBD on your car:


This is what the RS232 Serial connection looks like:


This is the ExpressCard adaptor that converts the serial cable into a signal the computer can read since my computer doesn't have a serial cable ports installed:


Hopefully you have a computer that has a serial port as that will make your life a bit more simpler. Also note, that there is a port on your computer that will look similiar to a serial port, but it isn't. It's a graphics port in case you ever want to hook up to an external/secondary monitor...

[Cutey]

LincolnMaster80,

I do appreciate the photos, very helpful.

DealExtreme has the card adapter also,
RS232 Serial Port 34mm Express Card Adapter for Laptop
Price: $9.80

I have read a couple of places, and one may have been from you that this 6.5 software works better on XP than it does on Vista.

Interesting bit about the serial port from a guy that makes an adapter,
http://forums.bimmerforums.com/forum...0&postcount=23

[lincolnmaster80]

Yes, CarSoft does work better on XP. I had an opportunity to try my diagnostics on my friends XP laptop and it ran much smoother.

[Cutey]

Shogun brings up some interesting information also:

Quote:
|
interesting is also this thread
http://forums.bimmerforums.com/forum....php?t=1657767

for the diagnosis tool better buy the one from Gert, he even has some additional stuff designed to read in the check control data

for example he mentioned:
Most of these observations stem from being able to see what the TCU is doing after I had my own failed 4HP24:
P = input to TCU from shift lever
EGS: 2 = signal send to tranny shift coils, converted binary.
- = will be a T when the TC is (should be) engaged
P: 56 = signal to pressure regulator coil, is a PWM signal

h ttp:// ww w.bim me rb oar d.co m/me mber s/rv8fly boy/disp 5.JPG

End quote

[Cutey]

LincolnMaster80,

Are you saying that you have been successful with Carsoft on Vista?

[lincolnmaster80]

Well, I've scanned my car with both my Vista laptop and my friends XP laptop...unless my CarSoft is shot, I got identical results. In the beginning, it took me a little while to figure out how to get it working, but I got it. Mostly it was the USB-to-serial adaptors I was using, until I found out the ExpressCard adaptor and everything seemed to respond. I've posted pictures of my scan results asking why I couldn't get a responce form certain modules, but apparently it's because those systems weren't invented yet. There is one problem I have with my V12 that I can't diagnose with an OBD scan. I'm chalking that one up to the supposed limited capabilities of CarSoft 6.5...I want Version 10 that's out now....

http://www.carsoftsales.com/BMW73/pricelist.html
http://www.carsoftsales.com/BMW73/dl...0-coverage.pdf

That being said, I don't really know what failure is when it comes to CarSoft because I haven't had the opportunity to try any other OBD programs.

[Cutey]

I usually do not have to use the typical “ Blonde” disclaimer, but I have more information
that may should have been applied much earlier in my diagnostic quest.

First I do want to thank everyone that has contributed to the discussion and to my questions –

Also I have downloaded http://www.e38.org/electran1.pdf Electronic Transmission Control Manual
And http://www.e38.org/transfund1.pdf that clearly shows a many number of components
could be causing my no gear issue.

Everyone should download a copy of these manuals – I am still absorbing –


When I purchased Cupcake 18 months ago I was presented with receipts that showed the transmission
and engine had both been overhauled only 20,000 miles earlier, now at 35,000. I cannot currently find
those receipts – But I did not expect any trouble out of either –

I also had the LAD shocks removed and standard shocks installed – The had told the shop that did this
To cap the hydraulic line from the power steering pump at the shocks in case I wanted to re-use latter –

Shortly after leaving the area I noticed a noise coming from under the car, that I thought was this line
Pulsating.

This noise would only happen when I would idle for an extended amount of time or would drive very slowly
For an extended amount of time –

When it would happen, it would only make the thumping sound when the car was moving, it would increase
In speed as the car did also, it would get loader when I steered to the right and stop when I steered to the left.

As I drove faster so did the thump until I would reach about 45 mph approx. and then it would quit – Once it
Quit it would be fine until I went back to long idling –

I thought that the powers steering line had air in it that would cause it to jump like an air filled waterline will –
I see now that the mechanic had capped the line at the pump so the noise was coming from another source,
Like maybe the transmission –


Does this noise give anyone any insight as to the likely problem?