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3 860 AT F co o ling 3 73 0 T iptro nic co ntro l unit installatio n · po siti
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911 Transmission 3
3 860 AT F co o ling 3 73 0 T iptro nic co ntro l unit installatio n
po sitio n
The 32-pole transmission control unit is
manufactured by Siemens and is installed on
the right-hand side of the passenger com-
partment at the bottom of the B-post in front
of the rear-seat well.
3_09_00
The ATF fluid heats up and must be cooled;
this especially applies to operation with open
torque converter lockup clutch.
An ATF-to-water heat exchanger attached to 3_15_00
the transmission is used for cooling. Diagnosis can be performed on this control
Depending on the ATF and water tempera- unit using the Porsche System Tester 2.
ture, the electric switch-over valve is actu-
ated by the DME control unit and allows a
vacuum to enter the shut-off valve.
Cooling on Coolant temp. > 100°C
ATF temperature > 90°C
Cooling off Coolant temp. < 90°C
ATF temperature < 83°C
The DME control unit reduces power output
when the ATF temperature exceeds 143°C.
2002 Service Information 3 -17
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