Cruise Control System - Troubleshooting
89porsche06Technical Bulletin
Subject: Cruise Control Troubleshooting
Model Group
911 Carrera 2
Part Identifier Number
2778 8908
December 8, 1989
ATTENTION: Service Manager/Service Technician
911 Carrera from Model Year 1988
The pneumatic cruise control system was replaced with an electrically controlled version (Tempostat E) as of model year 1988. The cruise control unit of this version is identical with the control unit used in 928 S4 models.
When troubleshooting the cruise control system on 911 Carrera cars up to and including model year 1987 (pneumatic version), use troubleshooting guide from 911 Carrera Workshop Manual, Volume 1, Page 27-3.
For 911 Carreras as of model year 1988 (electrically controlled version), use troubleshooting guide from 928 Workshop Manual, Volume 1-A, Pages 27-21 through 27-23.