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PCM2 Gateway Control Module Function



Control Unit Function

Terminal Resistance On The CAN
To prevent reflection on the wiring, the ends of the wires are each provided with a terminal resistor, which are integrated into two control modules.

CAN Comfort
Communication between the Porsche System Tester II No. 9588 and the MOST control modules only takes place via the K lead to the instrument cluster. The data is transferred from the instrument cluster gateway to the MOST control modules via CAN comfort to the PCM2 gateway, via the electrical MOST in the PCM2 and via the optical MOST outside of the PCM2.

CD Changer (CDC)
The CDC is available as an optional feature and is linked to the PCM2 via the optical waveguide.

Coding
It is possible to extract the chassis number and to code the PCM2 on a country-specific basis under this 'Modify coding' menu.

Menu Item Function

- PCM2 code It is possible to code the PCM2 code under this menu item after replacing the PCM2.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control modules selection and confirm with the >> key.
- Select 'PCM2-GW' in the PCM2 function selection and confirm with the >> key.
- Select Coding menu item.
- Select "PCM2-Code" menu item.
- Take PCM2 code from IPAS and enter and code with F8 key.

- Vehicle type vehicle
coding Using this menu item, you can code the PCM2-GW according to the vehicle type:
- Connect and start the Porsche System Tester II No. 9588 start and switch on the ignition.
- Select '911 Turbo (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-GW' in the 911 Turbo (996) function selection menu and confirm with the >> key.
- Select 'Coding' in the PCM-GW function selection menu and confirm with the >> key.
- Select 'Vehicle type coding' in the Coding menu and confirm with the >> key.
- Select "911 Turbo (996)" and code with the F8 key.

- Vehicle type
vehicle version Using this menu item, you can code the PCM2-GW according to the vehicle type:
- Connect and start the Porsche System Tester II No. 9588, start and switch on the ignition.
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control module menu and confirm with the >> key.
- Select 'Coding' in the 911 Turbo (996) function selection menu and confirm with the >> key.
- Select "Vehicle type" in the PCM2 coding menu and confirm with the >> key.
- Select appropriate vehicle type "Coupe, Cabrio, Targa" and code with the F8 key.

- Right/Left-hand drive
vehicle coding Using this menu item, you can code the PCM2-GW according to the vehicle coding type:
- Connect and start the Porsche System Tester II No. 9588, start and switch on the ignition.
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control module menu and confirm with the >> key.
- Select 'Coding' in the 911 Turbo (996) function selection menu and confirm with the >> key.
- Select "Vehicle type coding right/left-hand drive" in the PCM2-GW coding menu and confirm with the >> key.
- Select 'Vehicle type coding right/left-hand drive' in the PCM2 coding menu and confirm with the >> key.
- Select "Right/left-hand drive" from the menu, depending on the vehicle equipment, and code with the F8 key.

- With/without air
conditioning Using this menu item, you can code the PCM2-GW according to the air conditioning equipment:
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control modules selection and confirm with the >> key.
- Select 'PCM2-GW' in the PCM2 function selection and confirm with the >> key.
- Select 'Coding' in the PCM2-GW menu and confirm with the >> key.
- Select 'Air conditioning with/without' in the PCM2-GW coding menu and confirm with the >> key.
- Select "Air conditioning with/without" in the PCM2-GW coding menu item according to the equipment and confirm with the >> key.
- Select "Relevant country coding" from the menu item that is displayed and code it with the F8 key.

- Tuner parameter Under this menu item, you can code the tuner parameter (country-specific tuner setting) according to the country of admission.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control module selection menu and confirm with the >> key.
- Select 'PCM2-GW' in the 911 Turbo (996) PCM2 function selection menu and confirm with the >> key.
- Select 'Coding' in the PCM-GW function selection menu and confirm with the >> key.
- Select "Tuner parameter" in the PCM2-GW coding menu and confirm with the >> key.
- Select the 'country code' that corresponds to the country of admission with the > key and code with the F8 key.

- Units Using this menu item, you can code the relevant units:
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (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-GW' in the 911 Turbo (996) PCM function selection menu and confirm with the >> key.
- Select 'PCM2-GW' in the 911 Turbo (996) function selection menu and confirm with the >> key.
- Select 'Coding' in the PCM-GW function selection menu and confirm with the >> key.
- Select "Units" in the PCM2-GW coding menu and confirm with the >> key.
- Select "Relevant units" from the menu item that is displayed and code them with the F8 key.

The following selection is available:
- Metric, RoW (degree C, litre, km)
- UK English (degree C, gallon mph)
- US English (degree F, gallon mph)

- MOST switches If the PCM2 is operated without additional MOST control modules, the MOST switch must be closed. The MOST switch must only remain open when MOST control modules are connected.

Using this menu item, you can code the relevant vehicle version:
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (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-GW' in the PCM2 function selection menu and confirm with the >> key.
- Select 'PCM2-GW' in the 911 Turbo (996) function selection menu and confirm with the >> key.
- Select 'Coding' in the PCM2-GW function selection menu and confirm with the >> key.
- Select "MOST switch open/closed" in the PCM2-GW coding menu and confirm with the >> key.
- Select 'MOST switch' in the modify PCM2-GW coding menu and confirm with the >> key.
- Select "MOST switch open/closed" from the menu item that is displayed and code with the F8 key

The following selection is available:
- Open
- Closed

- Production mode The PCM2 is set to a low-current mode at the factory and this must be switched off to allow operation.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (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-GW in the 911 Turbo (996) PCM2 function selection menu and confirm with the >> key.
- Select 'Coding' in the PCM2-GW function selection and confirm with the >> key.
- Select 'Production mode' in the PCM2-GW coding menu and confirm with the >> key.
- Select "Production mode off" from the menu item that is displayed and code it with the F8 key.

The following selection is available:
- Production mode on
- Production mode off

- Country coding Using this menu item, you can code the country code:
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control modules selection and confirm with the >> key.
- Select 'PCM2-GW' in the PCM2 function selection and confirm with the >> key.
- Select coding menu item and confirm with the >> key.
- Select "Country coding" in the PCM2-GW coding menu item and confirm with the >> key.
- Select "Relevant country coding" from the menu item that is displayed and code it with the F8 key.

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 coded, 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 made.

Diagnosis Distribution Line
The diagnosis distribution 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 electrically/optically checked at regular intervals during communication with the control modules via the MOST.

Extended Fault Memory
This menu item allows additional data to be read out of the PCM2-GW:
- DTC fault symptom, limit value exceeded or not reached.
- DTC storage state, no fault established, not available, available
- Fault type undervoltage (< 9 volt)
- Fault type overvoltage (> 16 volt)
- Fault type EEPROM fault
- Fault type tuner communication fault
- Fault type distribution breakage
- Frequency counter
- Temperature
- Voltage
- Vehicle speed

1. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
2. Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
3. Select 'PCM' in the control modules selection and confirm with the >> key.
4. Select 'PCM2-GW' in the 911 Turbo (996) PCM2 function selection menu and confirm with the >> key.
5. Select the "identification" menu item and press the >> key.
6. The message "Diagnosis software number; PCM2. parts number" appears on the display.
7. By pressing the F8 key, the respective 'Extended identification' is displayed.

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

Extended Identification
This menu item allows the following data to be read out of the PCM2-GW:
- CRIN (Car Radio Identification Number)
- VIN (Vehicle Identification Number)
- Vehicle manufacturer ECU hardware number
- System supplier ECU hardware number (cw/year)
- System supplier ECU hardware version no.
- System supplier ECU software no. (cw/year)
- System supplier ECU software version no.
- Porsche workshop number
- Diagnosis software number
- Date ECU manufacturing (YYY.MM.DD).

1. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
2. Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
3. Select 'PCM' in the control modules selection and confirm with the >> key.
4. Select 'PCM2-GW' in the 911 Turbo (996) PCM2 function selection menu and confirm with the >> key.
5. Select the "Identification" menu item and press the >> key.
6. The message "diagnosis software number; parts number PCM2" appears on the display.
7. By pressing the F8 key, the respective 'Extended identification' is displayed.

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

Function Of The Components







Gateway
The gateway is integrated into the PCM2. Together with the MMI, it is a fixed component of each PCM2. It provides a connection to CAN Comfort via its nodes. Diagnosis and useful data is exchanged with 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/rack)
- Man Machine Interface (MMI)
- Single CD
- Media Oriented Systems Transport (MOST), external bus (optical)
- Amplifier optional (Harman or BOSE)
- CD changer
- Telephone/telematics

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 No. 9588 and switch on the ignition.
2. Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
3. Select 'PCM' in the control modules selection and confirm with the >> key.
4. Select 'PCM2-GW' in the PCM2 function selection and confirm with the >> key.
5. Select the "Identification" menu item and press the >> key.
6. The message "diagnosis software number; parts number PCM2" 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
It is possible to read out the supply voltage and the unlock counter under the 'Actual values' menu item.

Menu Item Function

- Supply voltage 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
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control modules selection and confirm with the >> key.
- Select 'PCM2-GW' in the 911 Turbo (996) PCM2 function selection menu and confirm with the >> key.
- Select the 'Actual values' menu item and confirm with the >> key.
- Select the "Supply voltage" menu item, select with the > key and confirm with the >> key.
- Read out values from the display field.

- Unlock counter 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
- Select '911 Turbo (996)' in the vehicle type menu and confirm with the ->| key.
- Select 'PCM' in the control modules selection and confirm with the >> key.
- Select 'PCM2-GW' in the PCM2 function selection and confirm with the >> key.
- Select the 'Actual values' menu item and confirm with the >> key.
- Select the "Unlock counter" menu item using the > key and confirm with the >> key.
- Read out values from the display field.

Lock/Unlock
There is a lock present when the MOST signal sent by the MMI (electronically or optically via the optical waveguide) can be recognised by the connected MOST control units.

Man Machine Interface (MMI)
The MMI is part of the PCM2 (on the mainboard). It runs the gateway commands via the wake-up signal line and the diagnosis of the distribution line.

MOST Actual Installations List/MOST Required Installations List
All MOST control modules that are connected to the PCM2 are entered in the 'required installations list'. An actual installations list is written and saved when the PCM2 is started.

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 ARS nodes.

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 (depending on the equipment). The gateway node represents the connection to CAN Comfort.

MOST Switch
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:
- 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 pushed into the PCM2 (optional). After inserting, an electronic connector is automatically opened and the module is integrated into the MOST ring.

Input Signals
The following queries can be run using this menu item:
- Registry startup status
- Internal ring startup status
- External ring startup status

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

- Tuner parameter 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
- Select '911 Turbo (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-GW' in the PCM2 function selection menu and confirm with the >> key.
- Select input signals menu item and confirm with the >> key.
- Select the "Parameter tuner" menu item using the > key and press the >> key
- Read out values from the display field.
- 'Startup status registry' required installations list is available.
- 'Startup status internal ring' MOST internal (electronic) is operational.
- 'Startup status external ring' MOST external (optical) is operational.

Single CD
The CD player is part of the PCM2. It is used to update the navigation system.

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

Control Unit PCM2 (head Unit).
The PCM2 control unit (head unit) includes the following components:

Internal:
PCM2 Gateway
PCM2 Man Machine Interface (MMI)
Internal amplifier (optional, depending on the equipment)
Tuner
Single CD
Navigation (optional/rack)
VOCS (voice control system) (optional/insertion)
Wake-up and diagnosis distribution line control
Controller Area Network (CAN) Comfort
MOST switch

External:
External amplifier (optional, Harman or BOSE)
CD changer (CDC), (optional)
Telephone/telematics (optional)

The PCM2 consists of at least two but a maximum of four MOST nodes, (Gateway, MMI and Navigation and VOCS (optional)), which communicate with each other electronically via the MOST. Data outside the PCM2 is transferred via the MOST.

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 controlled with the Porsche System Tester II No. 9588:
- Left balance
- Central balance
- Right balance
- Bass - minimum value
- Bass - centre position
- Bass - maximum value
- Front fader
- Centre fader
- Rear fader
- MOST power reduction start
- MOST power reduction stop
- MOST switch closed
- Open MOST switch
- Mute off
- Mute on
- MOST bus switch on
- MOST bus switch off
- Switch output on
- Switch output off
- Treble - minimum value
- Treble - centre position
- Treble - maximum value
- Volume - minimum value
- Volume - centre position
- Volume - maximum value

This instruction does not apply to the following points:
- MOST bus switch
- MOST power reduction

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

Telephone/Telematics
The telephone/telematics is available as an optional feature and is linked to the PCM2 via the optical waveguide.

Tuner
The tuner is part of the PCM2 (on the mainboard)

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.

External Amplifier
The external amplifier (Harman or BOSE) is available as an optional feature and is linked to the PCM2 via the optical waveguide.

Internal Amplifier
The tuner is part of the PCM2 (on the mainboard)

Wake-Up Function
In an idle state, all control modules that are connected to the MOST are in sleep mode. When the PCM2 is switched on, a 'wake-up signal' is sent via the gateway. This signal is answered by the MOST control modules that are connected via the optical MOST.
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