Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 1992 >> 968 Cabriolet L4-2990cc 3.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Tools and Equipment
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

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,
- check wiring for damage
- check connector terminals for tight fit, tight wire connections, deformation and corrosion
- 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.
pro multis · About Operation CHARM