911 Targa (996) F6-3.6L (2004)
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Unlock counter
Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting.
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Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
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Select '911 (996)' in the Vehicle type menu and confirm with the >> key.
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Select 'PCM' in the Control units menu and confirm with the >> key.
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Select 'CD changer' in the 911 (996) PCM2 function selection and confirm with the >> key.
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Select 'Unlock counter' in the 911 (996) CD changer function selection and confirm with the >> key.
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Select the 'Actual values' menu item and press the >> key.
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Select the "Unlock counter" menu item using the > key and press the >> key.
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Read out values from the display field.
Lock/Unlock
A lock occurs when the signal sent from the MMI via the wake-up/diagnosis distribution line is understood and answered by the connected MOST
control modules; this results in a 'lock (connection)'. The lock is maintained until the signal disappears, i.e. an 'unlock' occurs.
Man Machine Interface (MMI)
The MMI is part of the PCM2 (on the main board). It runs the gateway commands via the wake-up signal line and the distribution line diagnosis. If
control modules fail, this is reported to the gateway and saved there.
MOST - Optical/Electrical
MOST signals are transferred electrically within the PCM/CDR23 and optically outside of the PCM/CDR23. Internally, the PCM2 consists of at least 2
nodes (GW and MMI), which are installed in the device and can also be expanded to four nodes by adding the navigation and VOCS nodes. Internally,
the CDR23 consists of one node (GW) which is installed in the CDR23.
The data is transferred outside of the PCM2 via the optical waveguide, which creates a connection to the nodes in the external MOST control modules
such as external amplifiers and/or telephone/telematics (depending on the equipment). The data is transferred outside of the CDR23 via the optical
waveguide, which creates a connection to the nodes in the external MOST control modules such as external amplifiers and/or CD changers (depending
on the equipment). The gateway node represents the connection to CAN comfort.
MOST Actual And Required Installed Components Lists
All MOST control units connected to the PCM2 are entered in the 'MOST required installed components list'. The 'MOST actual installed components
list' is compared with the 'MOST required installed components list' each time the PCM2 is started. If an 'installed MOST control module' is not
reported, the MOST is switched off optically and a fault is recorded in the gateway.
MOST Switch
The MOST switch is part of the PCM2. It keeps the electrical MOST closed if no other MOST control module is optically connected to the MOST. The
MOST switch is opened when a light signal is received from the connected MOST control modules.
NOTE:
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When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control modules.
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When the 'Switch closed' parameter is set, the switch remains closed even in existing MOST control modules. Communication is then not possible.
Navigation
The navigation module is designed as a module box, which can be inserted in the PCM2 as an option. After the insertion, an electronic switch is opened
automatically and the module is integrated into the MOST ring.
Input Signals
The following queries can be run using this menu item:
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3dB lowering
NOTE: Deactivate the 'automatic traffic announcement' before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.
Menu item
Function
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3dB lowering
Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting.
-
Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
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Select '911 (996)' in the Vehicle type menu and confirm with the >> key.
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Select 'PCM' in the Control units menu and confirm with the >> key.
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Select 'PCM2 GW' in the 911 (996) PCM2 function selection and confirm with the >> key.
