What does this trouble code 4F85 Ratio.

Tiny
BLESSED1104
  • MEMBER
  • 2007 BMW 530I
  • 87,000 MILES
What does this trouble code 4F85 Ratio Monitoring Clutch E
mean?
Sunday, February 24th, 2013 AT 4:10 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hello,

This means there is a problem with the turbine sensor here is the sensor location so you can change it out. The Turbine Speed Sensor is used to provide input (turbine) shaft speed information to the TCM (EGS). The input shaft speed signal is used in conjunction with the output shaft speed signal to determine gear range and slip time information for processing in the TCM.

Not all BMW transmissions use a turbine speed sensor. Some TCM's use the TD (engine speed) signal to determine input shaft speed. All transmissions with the exception of the A5S325Z use an inductive type sensor which generates an AC analog signal. The A5S325Z currently uses a Hall Effect Turbine Speed Sensor which will send a digital square wave signal to the TCM.

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Sunday, February 24th, 2013 AT 4:25 PM

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