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HOMESERVICE MANUALSBMW2009528XI STANDARDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION CONTROL - OVERVIEWELECTRONIC TRANSMISSION CONTROLSYSTEM COMPONENTS (ELECTRICAL)TRANSMISSION OIL TEMP SENSOR
2009 BMW 528xi Standard

Transmission Oil Temp Sensor

2009 BMW 528xi StandardSECTION Transmission Oil Temp Sensor

The TCM is provided with transmission oil temperature information via a temperature sensor. On most BMW transmissions, the sensor is an NTC element which is part of the transmission internal wiring harness.

4HP22/24 (EH):  These transmissions do not use a transmission oil temperature sensor. There are no transmission oil temperature influenced features on the 4HP transmissions.

All Except A5S360/390R, GA6HP26Z:  The transmission fluid temp sensor is part of the transmission internal wiring harness. On these transmissions, the sensor cannot be replaced separately. The harness must be replaced.

A5S360/390R transmission:  the sensor is a separate, replaceable sensor that can be unplugged from the harness.

GA6HP26Z:  the sensor is located in the Mechatronics Module, which is located inside of the transmission.

NOTE: The Mechatronics Module is not currently serviceable at this time. Contact the BMW Technical Hotline in the event of a failure. Do not attempt any repair or replacement of the Mechatronics Module.

The transmission oil temperature information is used to:

  • Initiate the Warm Up Program
  • To inhibit TCC operation until a specified temperature has been reached.
  • For determining fluid level when used with diagnostic equipment.
    Fig 1: Transmission Oil Temperature Sensor Is Connected To TCM
    G03403790Courtesy of BMW OF NORTH AMERICA, INC.

The transmission oil temperature sensor is connected to the TCM via a 5 Volt reference and a circuit ground. As transmission oil temperature increases, the circuit resistance and voltage decrease proportionately.

RENDER: 1.0x

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