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PCM2 MMI



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.

Extended Identification
Additional data present in the control module can be read out using 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 modules menu and confirm with the >> key.
4. Select PCM2 MMI in the PCM2 function selection and confirm with the >> key.
5. Select Identification in the PCM2 MMI function selection and confirm with the >> key.
6. Diagnosis software number; PCM2 parts number appears on the display.
7. In the PCM2 - MMI identification function selection the extended identification can be read out using the F8 key or the >> key.

The following data can be read out:
- CRIN (Car Radio Identification Number)
- Date of ECU Manufacturing (YYYY;MM;DD)
- Repair Shop Code or Tester Serial Number
- System Supplier ECU Hardware Number (cw, year)
- System Supplier ECU Hardware Version Number
- System Supplier ECU Software Number (cw, year)
- System Supplier ECU Software Version Number
- Vehicle Manufacturer Diagnostic Index
- Vehicle Manufacturer ECU Hardware Number
- VIN (Vehicle Identification Number)

Function Of The Components


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 modules menu and confirm with the >> key.
4. Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
5. Select Identification in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
6. Diagnosis software number; PCM2 parts number appears on the display.

Actual Values
It is possible to read out the MOST unlock counter under the Actual values menu item.

Menu item
- Date

Function
Using this menu item, you can read out the current date from the PCM2.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) function selection and confirm with the >> key.
- Select Actual values in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Select Date in the PCM2 MMI actual values function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Transmission errors

Function
Using this menu item, you can read out the number of transmission errors from the PCM2.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the PCM2 MMI function selection and confirm with the >> key.
- Select Transmission errors in the PCM2 MMI actual values function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Time

Function
Using this menu item, you can read out the current time from the PCM2.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the PCM MMI function selection and confirm with the >> key.
- Select Time in the PCM2 MMI 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 counter 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Coding in the PCM2 MMI function selection and confirm with the >> key.
- Select MOST unlock counter in the PCM2 MMI coding function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Traffic broadcast loudspeaker boost

Function
Using this menu item, setting of the traffic broadcast loudspeaker boost can be read out.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Coding in the PCM2 MMI function selection and confirm with the >> key.
- Select Loudspeaker boost in the PCM2 MMI coding function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Time zone

Function
Using this menu item, you can read out the current time zone from the PCM2.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Coding in the PCM2 MMI function selection and confirm with the >> key.
- Select Time zone in the PCM2 MMI coding function selection and confirm with the >> key.
- Read out values from the display field.

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 distribution line.

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.)
- Diagnosis, open circuit in distribution line (ignition on.)
- Optical performance check
- Data transmission check
- MOST system check (with engine running)
- Ring break diagnosis (with engine 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 varying required and actual installed components list in the Control modules menu in front of the PCM2 system and in the PCM2 MMI function selection in front of the selection MOST required installed components list. A comparison of these two lists can determine missing components.

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

Menu item
- MOST System check (ignition on.)

Function
Using this menu item, a MOST system check can be carried out with (ignition on.) the ignition on. The following checks are carried out automatically and their results are displayed.
- Gateway start-up condition is read out.
- MOST installed components list (required and actual installed components list) is analysed.
- Start 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 Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 Cayenne PCM2 MOST components check function selection and confirm with the >> key.

Diagnosis, open circuit in distribution line (ignition on.)
This check must only be carried out when the engine is not running.

Menu item
Diagnosis, ring break diagnosis (ignition on.)

Function
The ring break diagnosis carries out the following checks:
- Gateway start-up condition is read out.
- MOST installed components list (required and actual installed components list) is analysed.
- Start 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 Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 Cayenne PCM2 MOST components check function selection and confirm with the >> key.
- Follow the Tester instructions.

Optical performance check

Menu item
- Optical performance check

Function
The optical performance check allows the performance of the MOST to be checked optically. The following checks are carried out automatically:
- MOST installed components list (required and actual installed components list) is analysed.
- External MOST components display.
- 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 Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 Cayenne PCM2 MOST components check function selection and confirm with the >> key.
- Follow the Tester instructions.

Data transmission check

Menu item
- Data transmission check

Function
Using this menu item, the quality of the data transmission can be assessed. This is a counter which leads to an increase in the value if faults occur 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 Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 Cayenne PCM2 MOST components check function selection and confirm with the >> key.

MOST system check (with engine running)

Menu item
- MOST system check (with engine running)

Function
Using this menu item, a MOST system check can be carried out with the ignition on. The following checks are carried out automatically and their results are displayed.
- Gateway start-up condition is read out.
- MOST installed components list (required and actual installed components list) is analysed.
- Ring line diagnosis.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 Cayenne PCM2 MOST components check function selection and confirm with the >> key.
- Follow the Tester instructions.

Whenever there are several ring breaks, the 1st ring break is displayed in the following order:
- PCM2 Gateway > external amplifier
- External amplifier > CD changer
- CD changer > telephone
- Telephone > PCM2 MMI

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

Ring break diagnosis (with engine running)

Menu item
- Ring break diagnosis (with engine running)

Function
Using this menu item, a ring break diagnosis can be carried out (with the engine running).
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select Cayenne in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the Control modules 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 (with the engine running) in the Cayenne PCM2 GW MOST components function selection and confirm with the >> key.

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 modules 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 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.

MOST - optical/electrical
MOST signals are transferred electrically within the PCM2 and optically outside of the PCM2. 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 (optional).

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, CD changers, and/or telephone/telematics (optional, depending on the equipment). The gateway node represents the connection to CAN comfort.

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.

MOST unlock counter
Interruptions occur in the system if perfect communication is no longer possible. If the relevant threshold values are exceeded, an entry is recorded in the appropriate control module and the unlock counter is incremented.

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 line 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:
- Key code
- Increment steps

NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort (only for software version < 03).

Menu item
- Key code

Function
Under this menu item, it is possible to check that the operating buttons are functioning 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the PCM2 function selection and confirm with the >> key.
- Select the Input signals menu item and confirm with the >> key.
- Key code is displayed on the Porsche System Tester II 9588. The function is activated by marking with the > key and actuating the >> key.
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated.

Menu item
- Increment steps

Function
This menu item shows the current status of the operating button.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the PCM2 function selection and confirm with the >> key.
- Select the Input signals menu item and confirm with the >> key.
- Select the Input signals menu item and confirm with the >> key.
- Increment steps is displayed on the Porsche System Tester II 9588 The function is activated by marking with the > key and actuating the >> key.
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated.

Input signals
The following queries can be run using this menu item:
- Key code
- Increment steps

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

Menu item
- Key code

Function
Under this menu item, it is possible to check that the operating buttons are functioning 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Key code is displayed on the Porsche System Tester II 9588. The function is activated by marking with the > key and actuating the >> key.
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated.

Menu item
- Increment steps

Function
This menu item shows the current status of the operating button.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Increment steps is displayed on the Porsche System Tester II 9588. The function is activated by marking with the > key and actuating the >> key.
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated.

Single CD
The CD player is part of the PCM2. It is used to play the audio and navigation CDs as well as to update the navigation system.

Special function
The following functions can be run using this menu item:
- Read address book
- Write to address book
- Read user data
- Write user data
- Read coding
- Write coding
- MOST actual installed components list

Voice control system (VOCS) (optional)
The VOCS (optional) is designed as a module box which can be pushed into the PCM2 (optional). After the insertion, 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 :
- Display colour black
- Display colour coloured bars
- Display colour blue
- Display colour red
- Display colour green
- Display colour white
- Set default values
- Ring break diagnosis
- Ring break line diagnosis

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

Menu item
- Display colour black

Function
Using this menu item, the function Display colour black can be checked.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the PCM2 MMI function selection and confirm with the >> key.
- Select Display colour black in the PCM2 MMI drive link function selection and confirm with the F8 key.
- The display must show the correct colour.

Proceed in the same way with the following tests.
- Display colour coloured bars
- Display colour blue
- Display colour red
- Display colour green
- Display colour white

Menu item
- Set default values

Function
Using this menu item, you can read out the set default values from the PCM2 MMI.
- 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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Set default values in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Ring break diagnosis

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 modules menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Ring break diagnosis in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Ring break line diagnosis

Function
Using this menu item, you can check the ring break diagnosis 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 PCM in the Control module menu and confirm with the >> key.
- Select PCM2 MMI in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Ring break line diagnosis in the 911 (996) PCM2 MMI function selection and confirm with the >> key.
- Read out values from the display field.
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