1. Introduction Warning: · Danger of damage!

1. Introduction Warning: Danger of damage! The manualcontains the diagnosisfor the follow- & > Never disconnect battery with ing system: engine running. PSM (Porsche Stability Management) > Never start engine without securelyconnectedbattery. The system is installed in the following vehicle: > Never use boost chargers to start 911 Carrera 4 (996) as of model year '99 the engine. Apart from general information about the system Disconnectthe negativeterminal (testers, component arrangement,etc.), the of the battery before welding manualalso containsa guided diagnosis work on the vehicle. procedure. This guided diagnosis should lead the technicianto the fault source. > Never pull off or push on the wiring harness plugs of the con- In order to locate a faulty component,the trol modules or other electronic instructionsfor the main diagnosistest must be components when the ignition is followed exactly. switched on. 1.1 General instructions / safety instructions The following points must be observed during vehicle diagnosis: -After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the cus- tomer must be informed of decoding and the deleted tuner memory. -When replacing a PSM control module, observe the coding and calibration of the steering-anglesensor. -After troubleshootingor repairs, erase the fault memory with the Porsche System Tester 2 and carry out a test drive. -After the test drive, read out the fault mem- ory with Porsche System Tester 2 again. 45 -D 60 4503 Diagnosis/troubleshooting PSM>