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  #1  
Old 02-05-2011, 04:50 PM
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haydar is on a distinguished road
Gearbox 'trans failsafe prog' problem

Hi all

I have a 2002 X5 4.4. I get the 'trans failsafe prog', first time the car is started and the car appears to be stuck in 3rd gear. When I switch the car off and then on again the car usually works fine for the rest of the day.

When I used the 'autologic' diagnostic system, the transmission module gave the following error p0700 and p1734: - Pressure Control Solenoid "2" Electrical.

Guessing it was a problem with one of the valves in the valve body, we opened the valve body and swapped the valves but the next morning we got the same Pressure Control Solenoid "2" Electrical. We've checked the wiring and nothing seems to be obvious wrong.

I read the following:-
http://www.xoutpost.com/bmw-sav-foru...fe-prog-2.html

Interestingly my car also showed a very high temperature reading a few times, however when we disconnected and reconnected the wiring loom to the ECU, the temp reading fixed itself.

Warm regards
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Old 02-06-2011, 05:26 PM
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Hi,

When you say ‘swapped the valves’ do you mean that you swapped the four black-capped solenoids around?

Are you measuring a resistance of just under 6 Ohms when measuring between pins 3 & 12?

Phil
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Old 02-06-2011, 05:44 PM
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Hi Phil

Thanks for the reply. Yes I am talking about the black solenoids. I will check the resistance tomorrow and let you know. The curious thing is that the car only complains first thing in the morning, after that it seems fine for the rest of the day even if I don't start it for hours.

Warm regards
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Old 02-07-2011, 10:08 AM
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Ok, checked pins 3 and 12. The resistance was 5.8 ohms.
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Old 02-07-2011, 12:27 PM
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Yes, that’s spot on.

Are you able to measure the resistance at the ECU end now to check the wiring in-between? If it’s the same as the L322 Range Rover (likely) it’s pins 11 & 27 (purple & black wires) of multiplug C1835 (diagram should help you identify it – there’s only 3 plugs to choose from & they’re all physically different).



Phil
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Old 02-07-2011, 10:32 PM
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I had a similar sounding issue over Christmas, turned out to be the alternator, and more specifically, the voltage regulator playing games with the ecu.
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Old 02-08-2011, 08:06 AM
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Quote:
Originally Posted by jac80m View Post
I had a similar sounding issue over Christmas, turned out to be the alternator, and more specifically, the voltage regulator playing games with the ecu.
How did they diagnose the fact that it was the voltage regulator?
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Old 02-08-2011, 12:46 PM
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^ what he said. How dis they know that?
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Pro motocrosser since 2005. First time BMW owner.
2002 4.4 E53
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Old 02-09-2011, 01:30 AM
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OK, here's the update:-

Just to be clear, the error comes before the car is actually started, only when the ignition is in the on position.

First thing in the morning when we get the error we took the following readings:-

i. Retook reading on pins 3 and 12, resistance 5.5 ohms.
ii. Resistance on pins 11 and 27 is 6.1 ohms.

On the chance that the problem was the alternator, I swapped my alternator with a friend who has a X5 4.6 (same alternator and part number). Again same problem in the morning.

Any ideas!!!

Thanks
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Old 02-09-2011, 01:44 AM
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could the ignition switch be a cause of the problem .. some members have strange problems when the switch develops faults .
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