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Data Transfer Fault



Data Transfer Fault

If faults are detected when the data is decoded, this is known as a data transfer fault. The faults can arise when the data is encoded, when the data is transferred through an input level that is optically too low or when the data is decoded. A fault entry is not recorded.

Installation position of the control module
The telephone control module is installed under the passenger's seat.

Function Of The Components







Gateway
The gateway is integrated in the PCM2. Together with the MMI, it is a fixed component of each PCM2. It provides a connection to CAN comfort via its nodes. Diagnostic and useful data is exchanged with the CAN via these nodes. It creates links to the following systems:
- CAN comfort
- Media Oriented Systems Transport (MOST), internal (electrical)
- Voice control system (VOCS) (optional/insertion)
- Navigation (optional/insertion)
- Man Machine Interface (MMI).
- Single CD
- Media Oriented Systems Transport (MOST), external bus (optical)

Identification
The diagnosis software number and the part numbers for the PCM2 can be read out under this menu item.
1. Connect and start the Porsche System Tester II 9588 and switch on the ignition
2. Select 911 (996) in the Vehicle type menu and confirm with the >> key.
3. Select PCM in the Control units menu and confirm with the >> key
4. Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
5. Select Identification in the 911 (996) telephone/telematics function selection and confirm with the >> key.
6. Diagnosis software number; PCM2 part number. appears on the display

NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.

Actual values
The following can be read out under the Actual values menu item.
- Transmission errors
- MOST unlock counter
- Signal strength
- Supply voltage

Menu item
- Transmission errors

Function
You can read out all transmission errors using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select Transmission errors in the 911 (996) telephone/telematics actual values function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- MOST unlock counter

Function
You can read out the MOST unlock counters using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select MOST unlock counter in the 911 (996) telephone/telematics actual values function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Signal strength

Function
You can read out the signal strength using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select Signal strength in the 911 (996) telephone/telematics actual values function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Supply voltage

Function
You can read out the supply voltage using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select Supply voltage in the 911 (996) telephone/telematics actual values function selection and confirm with the >> key.
- Read out values from the display field.

Lock/MOST unlock
A lock occurs when the signal sent from the MMI via the MOST optical/electrical is understood and answered by the connected MOST control modules. This applies a correct optical MOST signal. The lock is maintained until the signal is no longer detectable for a longer period of time (several micro seconds) unlock.

Man Machine Interface (MMI)
The MMI is part of the PCM2 (on the mainboard). It carries out the diagnostics of the ring break diagnosis line (stub cable) and the diagnostics of the optical ring line.

MOST actual and required installed components lists
All MOST control modules that are connected to the PCM2 are entered via diagnostic tester in the required installed components list. Only the MOST control units recorded in the MOST required installed components list are activated. An actual installed components list of detected devices is written and saved when the PCM2 is started.

MOST component check

NOTE: When there is a customer complaint or identifiable problems but no fault code entries, firstly the MOST component check is to be selected in the PCM2 function selection menu and then the MOST system check is to be carried out.

The MOST component check can be reached via the menu PCM2 function selection. This comprises a summary of the following check processes:
- MOST System check (ignition on.)
- Ring break diagnosis (ignition on.)
- Optical performance check
- Data transmission check
- MOST system check (when the engine is running)
- Ring break diagnosis (when the engine is running)

The MOST components check MOST system check is to be carried out when the display indicates unavailable MOST control modules. If no fault code is stored, the * symbol indicates a differing required and actual installed components list in the Control modules menu in front of the PCM2 system and in the PCM2 MMI function selection menu in front of the option MOST required installed components list. A comparison of these two lists can determine missing components.

MOST System check (ignition on.)
This check can only be carried out when the engine is not running.

Menu item
- MOST System check (ignition on.)


Function
Using this menu item, an automatic MOST system check can be carried out with the ignition on. The following checks are carried out automatically and their results displayed.
- Start-up status Gateway is read out.
- MOST installed components list (required and actual installed components list) are analysed.
- Starting the ring break diagnosis.
- The results are displayed by the Porsche System Tester II 9588.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select MOST components check in the PCM2 function selection and confirm with the >> key.
- Select MOST system check (ignition on) in the 911 (996) PCM MOST components check function selection and confirm with the >> key.

Ring break diagnosis (ignition on.)
This check can only be carried out when the engine is not running.

Menu item
- Ring break diagnosis (ignition on.)

Function
The ring break diagnosis carries out the following checks:
- Start-up status Gateway is read out.
- MOST installed components list (required and actual installed components list) is analysed.
- Starting the ring break diagnosis.
- The results are displayed by the Porsche System Tester II 9588.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select MOST components check in the PCM2 function selection and confirm with the >> key.
- Select Ring break diagnosis (top) in the 911 (996) PCM MOST components check function selection and confirm with the >> key.
- Follow the instructions of the tester

Optical performance check

Menu item
- Optical performance check

Function
The optical performance check makes it possible to optically check the performance of the MOST. The following checks are carried out automatically:
- MOST installed components list (actual and required installed components list) are analysed.
- Displaying the external MOST components.
- Carrying out the performance check.
- The result is displayed by the tester.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select MOST components check in the PCM2 function selection and confirm with the >> key.
- Select Optical performance check in the 911 (996) PCM2 MOST components check function selection and confirm with the >> key.
- Follow the instructions of the tester

Data transmission check

Menu item
- Data transmission check

Function
This menu item makes it possible to assess the quality of the data transmission. This is a counter which increases the value when faults appear within a certain time period. The check is carried out continuously at predetermined intervals.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select MOST components check in the PCM2 function selection and confirm with the >> key.
- Select Data transmission check in the 911 (996) PCM2 MOST components check function selection and confirm with the >> key.

MOST system check (when the engine is running)

Menu item
- MOST system check (when the engine is running)

Function
Using this menu item, an automatic MOST system check can be carried out with the ignition on. The following checks are carried out automatically and their results displayed.
- Start-up status Gateway is read out.
- MOST installed components list (required and actual installed components list) are analysed.
- Diagnosis of the ring line.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select MOST components check in the PCM2 function selection and confirm with the >> key.
- Select MOST system check (bottom) in the 911 (996) PCM2 MOST components check function selection and confirm with the >> key.
- Follow the instructions of the tester

When there are several ring breaks, the first ring break is always displayed in the order.
- PCM2 Gateway > external amplifier
- External amplifier > CD changer
- CD changer > telephone
- Telephone > PCM2 MMI

Then the check is terminated
- Start the optical performance check.

Ring break diagnosis (when the engine is running)

Menu item
- Ring break diagnosis (when the engine is running)

Function
A ring break diagnosis (when the engine is running) can be carried out using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control units menu and confirm with the >> key
- Select PCM2 GW in the PCM2 function selection and confirm with the >> key.
- Select MOST components check in the PCM2-GW function selection and confirm with the >> key.
- Select Ring break diagnosis (when the engine is running) in the 911 (996) PCM2-GW MOST components check function selection and confirm with the >> key.

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.

The following settings can be coded:
- MOST switch open
- MOST switch closed

NOTE:
- When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control modules.
- 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.

Ring break diagnosis line
The ring break diagnosis is an electrical lead, which, as a stub cable, connects the individual MOST control modules in the system with one another. The existing MOST control modules are checked at regular intervals during communication with the control modules via the electrical/optical MOST.

Input signals
The following queries can be run using this menu item:
- 3 dB lowering
- Signal strength

NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.

Menu item
- 3 dB lowering

Function
Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select the menu item 3 dB lowering and confirm with the >> key.
- Read out values from the display field.

Menu item
- Signal strength

Function
You can read out the MOST installed components list using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control units menu and confirm with the >> key
- Select Telephone/telematics in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the 911 (996) telephone/telematics function selection and confirm with the >> key.
- Select the menu item Signal strength and confirm with the >> key.
- Read out values from the display field.

Voice control system (VOCS)
The VOCS is designed as a module box which can be pushed into the PCM2 (optional). After inserting, an electronic switch is opened and the module is integrated into the MOST ring.

Drive links
Drive links of the PCM2 can be activated with this menu item. This allows the function of the drive links to be assessed very quickly.

The following drive links can be activated with the Porsche System Tester II 9588 :
- 3 dB lowering

NOTE: The activated drive link is automatically switched off after approximately 20 seconds.
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