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Home >> Porsche >> 2004 >> 911 Turbo Cabriolet (996) F6-3.6L Turbo >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Accessories and Optional Equipment >> General Module >> Testing and Inspection >> Scan Tool Testing and Procedures >> Gateway

Gateway



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 recorded.

NOTE: Using the function Reset all coding/transfer counters all set fault counters of all components can be collectively reset to 0.

Extended fault memory
Additional data from the PCM2 GW can be read out using this menu item.
- DTC fault symptom, limit value is exceeded or not reached.
- DTC storage state, no fault is detected, not present, present.
- Undervoltage fault type (< 9 volt).
- Overvoltage fault type (> 16 volt).
- Fault type, EEPROM fault.
- Fault type, tuner communication fault
- Fault type, open circuit in distribution line
- Frequency counter
- Temperature
- Voltage
- Vehicle speed

1. Connect and start the Porsche System Tester II 9588 and switch on the ignition.
2. Select 911 Turbo (996) in the Vehicle type menu and confirm with the >> key.
3. Select PCM2 in the control modules selection and confirm with the >> key.
4. Select PCM2 GW in the 911 Turbo (996) PCM2 function selection and confirm with the >> key.
5. Select the Identification menu item and press the >> key.
6. Diagnosis software number; PCM2 part number appear on the display.
7. Extended identification can be called up with the F8 key.

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

Extended identification
The following data from the PCM2 GW can be read out using this menu item:
- CRIN (Car Radio Identification Number).
- VIN (Vehicle Identification Number).
- Part 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.
- Porsche workshop number.
- Diagnosis software number.
- Date ECU manufacturing (YYYY.MM.DD).

1. Connect and start the Porsche System Tester II 9588 and switch on the ignition.
2. Select 911 Turbo (996) in the Vehicle type menu and confirm with the >> key.
3. Select PCM2 in the control modules selection and confirm with the >> key.
4. Select PCM2 GW in the 911 Turbo (996) PCM2 function selection and confirm with the >> key.
5. Select the menu item Identification and confirm with the >> key.
6. Diagnosis software number; PCM2 part number appear on the display.
7. Extended identification can be called up with the F8 key.

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

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)
- 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 9588 and switch on the ignition.
2. Select 911 Turbo (996) in the Vehicle type menu and confirm with the >> key.
3. Select PCM2 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 menu item Identification and confirm with the >> key.
6. Diagnosis software number; PCM2 part number appear 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 (applies only to version numbers < 03).

Actual values
Under the Actual values menu item, the supply voltage and the MOST unlock counter can be read out.

NOTE: Using the function Reset all coding/transfer counters all set fault counters of all components can be collectively reset to 0.

Menu item
- MOST unlock counter

Function
Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting. The MOST unlock counter counts all recognized unlocks (connection operation) and outputs these as the lawn.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the control modules selection and confirm with the >> key.
- Select PCM2 GW in the PCM2 function selection and confirm with the >> key.
- Select Actual values in the 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.

Menu item
- Supply voltage

Function
Under this menu item, it is possible to check the supply voltage during troubleshooting.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM2 in the control modules selection and confirm with the >> key.
- Select PCM2 GW in the 911 Turbo (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the menu item and confirm with the >> key.
- Select the Supply voltage menu item using the > key 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 main board). It carries out the diagnostics of the ring break diagnosis line (stub cable) and the diagnostics of the optical distribution 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 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 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:
- 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 faulty components.

Data transmission check

NOTE: Using the function Reset all coding/transfer counters all set fault counters of all components can be collectively reset to 0.

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 911 Turbo (996) 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 911 Turbo (996) 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 911 Turbo (996) 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 in the 911 Turbo (996) 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 911 Turbo (996) 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 (when the engine is running) in the 911 Turbo (996) PCM2-GW MOST components check function selection and confirm with the >> key.

MOST lock/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.

NOTE: Using the function Reset all coding/transfer counters all set fault counters of all components can be collectively reset to 0.

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.

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
The MOST - switch - switch is part of the PCM2. It keeps the electrical MOST closed if no other MOST control unit 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 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:
- 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 (applies only to version numbers < 03).

Menu item
- Registry startup status

Function
It is displayed under this menu item that installed MOST control modules can be read out from the actual installed components list.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) 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 Input signals in the PCM2 GW function selection and confirm with the >> key.
- Select Startup status registry in the PCM2 GW input signals function selection and confirm with the >> key.
- Read out values from the display field.

Menu item
- Internal ring startup status

Function
Under this menu item, the internal ring startup status can be read out during troubleshooting.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) 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 Input signals in the PCM2 GW function selection and confirm with the >> key.
- Select Startup status in the PCM2 GW input signals function selection and confirm with the >> key.
- Read out values from the display field.
- Internal ring startup status internal MOST (electrical) is functional.

Menu item
- External ring startup status

Function
Under this menu item, the external ring startup status can be read out during troubleshooting.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) 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 Input signals in the PCM2 GW function selection and confirm with the >> key.
- Select Startup status in the PCM2 GW input signals function selection and confirm with the >> key.
- Read out values from the display field.
- External ring startup status internal MOST (electrical) is functional.
- External ring startup status external MOST (optical) is functional.

Single CD
The CD changer 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 the insertion, an electronic switch is opened and the module is integrated into the MOST ring.

PCM2 control module (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/insertion).
VOCS (voice control system) (optional/insertion).
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 is transferred outside of the PCM2 via the optical 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 activated with the Porsche System Tester II 9588:
- Left balance.
- Central balance.
- Right balance.
- Bass - minimum value.
- Bass - centre position.
- Bass - maximum value.
- Front fader.
- Middle fader.
- Rear fader.
- MOST power reduction - start.
- MOST switch closed.
- MOST switch open.
- Mute off. u Mute on.
- MOST bus switch on.
- MOST bus switch off.
- Output switch on.
- Output switch off.
- Treble - minimum value.
- Treble - centre position.
- Treble - maximum value.
- Volume - minimum value.
- Volume - centre position.
- Volume - maximum value.

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

The subsequent note does not apply to the following:
- MOST bus switch
- MOST power reduction

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

Tuner
The tuner is part of the PCM2 (on the main board).

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 internal amplifier is part of the PCM2 (installed on the main board).

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 light is switched on via the MMI. It is reinforced and passed on by the MOST control modules that are connected.
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