Initial Inspection and Diagnostic Overview
Tire pressure warning system (RDK) diagnosisTire Pressure Warning System - Diagrammatic View:
General
- The system tester 9288 will be used for PORSCHE DIAGNOSIS from Mod. 89 onwards. PORSCHE DIAGNOSIS can be used for all systems capable of self diagnosis. Capable of self diagnosis means: the control unit can detect, store and output system errors.
- Read out tire pressure loss event memory (from control unit version R02 on (introducing during 1991 model year).
- As the number of systems capable of self diagnosis will be increasing in the foreseeable future, diagnosis of the relevant system will be filed at the end of the respective repair group as of now. The pages in repair group 03 continue to be applicable. Apart from the diagnosis procedure filed there to date (flashing code diagnosis with tester 9268) this will also contain a description of how to operate system tester 9288 (OFF-board diagnosis with plain text output).
- Tire pressure warning system diagnosis is not possible using tester 9268 (flashing code diagnosis).
Areas of application for the 9288 system tester on the RDK tire pressure control system
- Reading out the fault memory
- Reading out the tire pressure loss event memory, from control unit version R 02 on (introduced during 1991 model year)
- Checking the correct functioning of various components with the tester
- Switch inputs can be checked
Notes on troubleshooting
Aids
Use 1 or 2 auxiliary cables (own construction) for measurements on the control unit connectors and plug connections with the same contacts (fiat contacts).
This will prevent the contacts becoming deformed.
1 - Highly flexible line
2 - Crocodile clips (standard)
3 - Flat connector 2.8 (N 17.457.2)
Combined plug connections - distinguishing line features
There are several combined plug connections of the same type in the lines for brake-pad wear, speed sensors and HF sensors. The lines in this area can be distinguished from one another as follows:
- Sheathed lines for HF sensors and speed sensors.
For brake-pad wear: 2 lines protected by tubing.
- The HF sensor connectors have 1 pin and 1 socket. The connectors for the speed sensors have 2 pins with 2 sockets on the other side.
- There are 2 combined connectors on top of one another in the area of the spare wheel. The lines here are marked with RL - rear left and HR - rear right.