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7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 09-02-2014, 05:04 PM
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1994 740i E32 Strange Trans Program Issue:

1994 740 with intermittent no start condition. Fuel pump would not run at times, but would work if powered externally. Found a bad CPS was the problem. Replaced CPS and now have Trans Program light and 3rd speed range only. Hard reset does not fix the problem. Trans Program light was not on when I was driving the car in search of the intermittent fault.

Suggestions????
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  #2  
Old 09-04-2014, 07:54 AM
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Thoughts????
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  #3  
Old 09-04-2014, 05:00 PM
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Anybody....
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  #4  
Old 09-05-2014, 12:11 AM
bmw-mania bmw-mania is offline
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Quote:
Originally Posted by Doktor Bert View Post
1994 740 with intermittent no start condition.
Fuel pump would not run at times, but would work if powered externally.
Found a bad CPS was the problem.

The Crank Position Sensor was the problem(?)
Interesting Dx.. Herr Doktor.

Quote:
Originally Posted by Doktor Bert View Post
Replaced CPS and now have Trans Program light and 3rd speed range only.
Hard reset does not fix the problem.
Trans Program light was not on when I was driving the car in search of the intermittent fault.
... the problem didnt exist before the CPS *repair*...
Its probably related to the service undergone most recently.

If the CPS is a cheap chinese part.. Its suspect.

Quote:
to quote Shogun
Trans Prog Error "can be many things" sometimes not related to the transmission at all.
It is simply a way to protect the drive train when the computer senses something out of spec
Possible triggers include..
Low Battery Voltage
Low Trans Fluid
Low Alternator Voltage
Bad Trans speed sensor
Bad Trans CPU
incorrect signals from trans electronics
Bad or Faulty MAF signal
Bad or Faulty wheel Speed Sensor signal
Bad Or Faulty 02 sensor signals, etc...

Im sure its something small being overlooked.

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Suggestions????
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Originally Posted by Doktor Bert View Post
Thoughts????
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Originally Posted by Doktor Bert View Post
Anybody....
Maybe change your sig pic..
holding of a LED worklight near a rotor on a Porsche sends a mixed signal, Doc.
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  #5  
Old 09-08-2014, 09:07 AM
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Thanks for the input...

Yes, I too was surprised to find the cause of the intermittent no-start condition was a bad CPS and that it too was responsible for the fuel pump not running.

We use only genuine BMW parts.

Even when driving the car in an effort to duplicate the customer complaint, I had no 'Trans Program' error, even when the car would quit and then restart a short time later.

Oh yes, the worklight...we do a lot of pre-race technical inspections for cars that are being run at a couple of local race courses. The 'inspection' captured in my signature was a fairly standard daily practice here, inspecting rotors for heat checking and measuring thickness before signing off on the car...and you would be surprised how many Panamera's and Cayenne's people like to take to the race track!!!!
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Old 09-08-2014, 09:12 AM
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Just out of curiosity, does the trans CPU employ a relay????

I recall removing all 3 in the CPU 'nest' along the way. I believe that the blue, orange and white will only go in one position....

Thoughts????
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Old 09-08-2014, 10:31 AM
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Transmission fluid level is full...fluid isn't too bad looking for such a high mileage E32....
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  #8  
Old 09-08-2014, 11:03 AM
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Quote:
Originally Posted by Doktor Bert View Post
Thanks for the input...
Yes, I too was surprised to find the cause of the intermittent no-start condition was a bad CPS and that it too was responsible for the fuel pump not running.
We use only genuine BMW parts.
double check your BMW part (just in case)
Ive had a couple bad ones outta the box.

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Originally Posted by Doktor Bert View Post
Just out of curiosity, does the trans CPU employ a relay????
I recall removing all 3 in the CPU 'nest' along the way.
I believe that the blue, orange and white will only go in one position....
Thoughts????
I can't recall..
Check the ETM..
http://www.e38.org/e32/e32_93_etm.pdf
component location chart on page 562

Im pretty sure relays only go in one way..
parroted from shogun.. cuz its true.
Check all relays and fuses in engine room and also under the rear seat driver side.
Best is to replace all fuses, especially the one for the rear window heating system, there were cases when these started to melt due to corrosion/oxydation.
Use good electrical contact cleaner, NOT WD-40 or similar stuff. It leaves oil behind that collects dust and dirt, not the best for electrical contacts.
http://en.wikipedia.org/wiki/WD-40

Contact cleaner or denatured alcohol should be the thing you use to clean an electrical contact.
Spray the corroded connectors with the electrical contact cleaner.
Scrub the contacts if required with an old toothbrush to remove the powdered corrosion.

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Originally Posted by Doktor Bert View Post
Transmission fluid level is full...fluid isn't too bad looking for such a high mileage E32....
Indication of last service?

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Originally Posted by Doktor Bert View Post
Oh yes, the worklight...we do a lot of pre-race technical inspections for cars that are being run at a couple of local race courses.
The 'inspection' captured in my signature was a fairly standard daily practice here,
inspecting rotors for heat checking and measuring thickness before signing off on the car…..
and you would be surprised how many Panamera's and Cayenne's people like to take to the race track!!!!
Probably surprised at the amount of warped rotors too!

At least its not a riced out lexus.
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Last edited by bmw-mania; 09-08-2014 at 11:06 AM.
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  #9  
Old 09-08-2014, 11:05 AM
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Checking all above described....
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  #10  
Old 09-08-2014, 11:15 AM
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Just for conversation's sake...if the old CPS failed intermittently and did not trigger a Trans Program fault, what would cause the replacement to do this????
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  #11  
Old 09-08-2014, 12:15 PM
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Ok,

I just accessed the transmission memory with my Launch Diagun and retrieved Code 2 P/N Shift Lock...
I have back up lamps and brake lamps, the engine will only start in 'P' or 'N' and the shifter has no interlock feature and P-R-N-D-S-L only appears during cranking. It goes out after starting, as does the readout on the cluster from the 'E' & 'M' switch...
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  #12  
Old 09-08-2014, 12:40 PM
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Going into the console...
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  #13  
Old 09-08-2014, 03:08 PM
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No power to the P/N Shift Lock...
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  #14  
Old 09-08-2014, 10:44 PM
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Quote:
Originally Posted by Doktor Bert View Post
I just accessed the transmission memory with my Launch Diagun
and retrieved Code 2 P/N Shift Lock...
Quote:
Originally Posted by Doktor Bert View Post
No power to the P/N Shift Lock...
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Originally Posted by Doktor Bert View Post
I have back up lamps and brake lamps,
the engine will only start in 'P' or 'N'
affirmative
only starts in P or N.

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Originally Posted by Doktor Bert View Post
and the shifter has no interlock feature and P-R-N-D-S-L only appears during cranking.
It goes out after starting, as does the readout on the cluster from the 'E' & 'M' switch.


Sounds like your on the right track!
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  #15  
Old 09-08-2014, 11:21 PM
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When mine had the same problem after changing the CPS it was the MAF connection wasn't tight.
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  #16  
Old 09-08-2014, 11:59 PM
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Quote:
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When mine had the same problem after changing the CPS it was the MAF connection wasn't tight.
^
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Originally Posted by bmw-mania View Post
Possible triggers include..
incorrect signals from trans electronics
Bad or Faulty MAF signal
yup… its one of the triggers..
I think I actually parroted you when I thought of the MAF, Terry..
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  #17  
Old 09-09-2014, 08:25 AM
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Quote:
Originally Posted by TerryY View Post
When mine had the same problem after changing the CPS it was the MAF connection wasn't tight.
Thanks, guys, that makes some sense.

Yesterday, I was able to erase the fault code with the Launch Diagun and the P-R-N-D-S-L and 'E-P' display reappeared and I could activate the E-P switch and change the dash display from 'E' to '*' by manipulating the switch. The P/N lock still didn't extend, but I had no Trans Program message.

The instant the motor started, I got the 'Trans Program' message and code #2 for P/N/ Shift Lock...

More to follow...
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Old 09-09-2014, 09:46 AM
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What energizes the P/N lock??? On my E34, the lock would not retract when the brake lamp switch was bad, but in this case, the pin is fully retracted and there is no voltage to the switch. Cleaning/disconnecting/reconnecting the MAF has no effect.
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Old 09-09-2014, 11:40 AM
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The voltage for the shift lock comes from an internal relay in the Transmission Control Module...
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Old 09-09-2014, 12:24 PM
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Update:

In the DME 'nest' there are 3 relays - one is white, one orange and one blue. The blue one is for fuel pump function. I swapped around a mix of relays, from other places on the car, substituting an orange 4 pole for the blue 4 pole fuel pump relay, a yellow relay for the white one and an orange 5 pole for the orange 5 pole. Nothing changed....
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Old 09-09-2014, 03:35 PM
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The brakelamps work and there is no indicator for faulty brake lamps, so I would have to assume the switch is good...
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  #22  
Old 09-10-2014, 09:56 AM
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Thoughts????
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  #23  
Old 09-11-2014, 10:37 PM
bmw-mania bmw-mania is offline
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If the TCM was bad.. it would have flashed you the error message before your service.

I really think it has something to do with the parts used during service.
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  #24  
Old 09-12-2014, 05:17 PM
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Hmmmmm.....

Could the CPS function and still cause this??? I can try and swap in the old one....Grrrrr!!!!!
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  #25  
Old 09-20-2014, 05:27 AM
edgex edgex is offline
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Just backed the 750 into the garage, was going to leave again and now there is no start ( like battery is dead) it's brand new. Also very weird clattering noise under the hood with key in start position. Sounds like on the passengers side, also Trans mode. First time ever seeing this. Very worried. Can you PLEASE help. I'm very new to these cars.
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