968 Cabriolet L4-2990cc 3.0L DOHC (1993)
Transmission Control Systems: Tools and Equipment
Use of the following auxiliary tools is recommended when checking the Tiptronic:
^ Diagnosis Tester 9288 with connection cable
^ Voltage and resistance meter (internal resistance> 10M Ohms)
^ Oscilloscope
^ Jump lead with matching spade connectors
General information
^ Do not run resistance measurements on live wiring
^ If poor terminal connections are found,
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check wiring for damage
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check connector terminals for tight fit, tight wire connections, deformation and corrosion
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Before replacing the transmission or the Tiptronic control unit, always check wiring harness and system components with the System Tester.
Otherwise new control unit or transmission may be destroyed again.
Abbreviations:
TE = Transmission electronics = - System components
HCU = Hydraulic transmission control unit
Signals that can be checked with the oscilloscope
^ Speed signal (from ABS)
^ Speed signal (from transmission)
^ Rpm signal (n-Mot) (from DME)
^ ti signal (load of DME)
Definitions
System voltage - The system voltage reflects the current charging state of the battery. When the battery is discharged, the voltage is approx. 11 V,
when the engine is running it is approx 14.5 V.
Unit functions
Installed units must operate correctly within a voltage range of 9.5 to 16.8 Volts.