DME control module signal output

If a fault is detected and stored, the prevailing ambient conditions are also stored and can be read out later with the generic scan tool. This makes troubleshooting much easier because operating data are available that were present at the moment the fault occurred.

These ambient conditions of a fault are stored the first time the fault occurs. If the same fault occurs a second time, these ambient conditions are also stored. Each further occurrence of a particular malfunction updates the ambient conditions of the last time the malfunction occurred, i.e. the ambient conditions present the first and last time the same malfunction occurred can be read out.

These ambient conditions can be read out only with the Porsche System Tester 2.

The ECM must be able to give out the following signals (freeze frame data) with a generic scan tool (SAE J1979):

• Diagnostic Trouble Codes
• Engine load
• Engine coolant temperature
• Oxygen sensing status (oxygen sensor)
• Oxygen sensing adaptation values
• Fuel pressure (when available)
• Ignition angle
• Intake air temperature
• Intake manifold pressure (when available)
• Air mass value
• Engine speed
• Throttle position
• Secondary air status
• Vehicle speed