Phatty5BMW
01-07-2009, 09:16 AM
Hey guys, Sorry for starting another post of the trans issue I have been having. I wrote ZF regarding the issue I was having about the trans not wanting to shift. Here is what they said.
Dear sir thank you for contacting ZF regarding your transmission problem. From the information you provided I am going to guess this transmission is a 1043 010 644. This would be the number on the metal id tag attached to the transmission. It’s important as it provides detail into the specific engineering of this transmission. This transmission has electronic shift control. The difference between manual mode and auto mode is strictly programming. If the transmission shifts in manual it indicates mechanically it is properly working and all the shift solenoids are also firing correctly. The fact you indicate it free wheels tells me its not receiving the correct signals to perform the next shift. One item that could affect this is the out-put speed sensor. If it’s reading incorrectly the trans controller would not realize how fast your moving and would not command the next shift. More than likely I would suspect this is not the cause as it’s a sealed sensor with no moving parts. If the vehicle was sitting why would it fail? Also the sensor is internal and should not have picked up any moisture in the plug. I would look at engine sensors. Mainly the TPS and or MAP/mass air whichever it has. The TPS may be providing a wide open signal to the trans controller. This would cause late shifts or full throttle shifts in every range and the free wheeling you are speaking of. It would also cause incorrect fuel ratio and some drivability problems. If the engine runs well I would go back to the out-put speed sensor. It is also possible corrosion has occurred at the controller connector or within the controller it self.
What do you guys think. M30 doesn't have have a TPS does it? I will have to do some research on real oem and find out if that output speed sensor is replaceable without taking the trans out and what not. What do you guys think? Any input?
TIA!!
-Pat
Dear sir thank you for contacting ZF regarding your transmission problem. From the information you provided I am going to guess this transmission is a 1043 010 644. This would be the number on the metal id tag attached to the transmission. It’s important as it provides detail into the specific engineering of this transmission. This transmission has electronic shift control. The difference between manual mode and auto mode is strictly programming. If the transmission shifts in manual it indicates mechanically it is properly working and all the shift solenoids are also firing correctly. The fact you indicate it free wheels tells me its not receiving the correct signals to perform the next shift. One item that could affect this is the out-put speed sensor. If it’s reading incorrectly the trans controller would not realize how fast your moving and would not command the next shift. More than likely I would suspect this is not the cause as it’s a sealed sensor with no moving parts. If the vehicle was sitting why would it fail? Also the sensor is internal and should not have picked up any moisture in the plug. I would look at engine sensors. Mainly the TPS and or MAP/mass air whichever it has. The TPS may be providing a wide open signal to the trans controller. This would cause late shifts or full throttle shifts in every range and the free wheeling you are speaking of. It would also cause incorrect fuel ratio and some drivability problems. If the engine runs well I would go back to the out-put speed sensor. It is also possible corrosion has occurred at the controller connector or within the controller it self.
What do you guys think. M30 doesn't have have a TPS does it? I will have to do some research on real oem and find out if that output speed sensor is replaceable without taking the trans out and what not. What do you guys think? Any input?
TIA!!
-Pat