8007 Pcm2 - MMI: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING - 8007 PCM2 - MMI

Work instruction			Display OK	If not OK
1	Read out PCM2 fault memory	Connect the Porsche System Tester II 9588 to the diagnostic socket, start it and switch on the ignition Select Boxster (986) in the Vehicle type menu and confirm with the ">>" key Select PCM in the Control units menu and confirm with the ">>" key Select PCM2 MMI in the Boxster (986) PCM2 function selection and confirm with the ">>" key Select Fault memory in the PCM2 MMI function selection and confirm with the ">>" key Read out fault memory Erase fault memory Remove ignition key and switch on ignition again Read out fault memory Extract ambient data, press the ">>" key	The fault is remedied -> End	Fault code is still displayed Step 2
2	Check MOST components	Connect the Porsche System Tester II 9588 to the diagnostic socket, start it and switch on the ignition Select Boxster (986) in the Vehicle type menu and confirm with the ">>" key Select PCM in the Control units menu and confirm with the ">>" key Select MOST component check in the Boxster (986) PCM2 function selection menu and confirm with the ">>" key Wait for the end of the automatic check The duration of the check depends on the number of existing MOST control modules The result of the test indicates if a fault was diagnosed in the system, and if so, where it is located.	Gateway > amplifier optically OK electrically OK Amplifier > CD changer optically OK electrically OK CD changer > telephone/optically OK electrically OK Telephone > MMI optically OK electrically OK MMI > navigation electrically OK Navigation > VOCS electrically OK VOCS > navigation electrically OK	An optical fault is displayed 3 An electrical fault is displayed 4
3	Optical fault	Replace the relevant optical waveguide between the listed faulty components with the optical waveguide test line 9712 that is provided as a special tool. Check MOST components again	Replace the faulty optical waveguide with the relevant spare part -> End	Replace the relevant recipient MOST control module Step 2
4	Check diagnosis distribution line for open circuit	Check diagnosis distribution line between the listed faulty components for an open circuit Switch ignition off Disconnect the plug connections of the existing MOST control modules Measure the resistance of the diagnosis distribution line between the relevant plug connections	< 0.5 Step 5	Remove open circuit in diagnosis distribution line -> End
5	Check diagnosis distribution line for short circuit to ground	Check diagnosis distribution line between the listed faulty components for short circuit to ground Switch ignition off Disconnect the plug connections of the existing MOST control modules Measure the resistance of the diagnosis distribution line to ground	Step 6	Remove short circuit to ground in diagnosis distribution line -> End
6	Check diagnosis distribution line for short circuit to B+	Check diagnosis distribution line between the listed faulty components for short circuit to B+ Switch ignition off Disconnect the plug connections of the existing MOST control modules Measure the voltage of the diagnosis distribution line to ground Switch ignition on	0 V Step 7	Remove short circuit to B+ in diagnosis distribution line -> End
7	Replace PCM2		-> End	-