Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 2004 >> 911 Carrera 4 (996) F6-3.6L >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Accessories and Optional Equipment >> General Module >> Testing and Inspection >> Scan Tool Testing and Procedures >> CDR23

CDR23



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.

Function of the components







Gateway
The gateway is integrated in the CDR23. It is a fixed component of each CDR23. It provides a connection from CAN comfort to the MOST 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)
- 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
5. Select Identification in the 911 (996) CDR23 function selection and confirm with the >> key.
6. Diagnosis software number; CDR23 parts number appears on the display.

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

Menu item
- Unlock counter

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 CDR23 in the Control modules menu and confirm with the >> key.
- Select Actual values in the CDR23 function selection and confirm with the >> key.
- Select Unlock counter in the CDR23 Actual values function selection and confirm with the >> key.
- Read out values from the display field.

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:
- 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 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 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 CDR23. Internally, the CDR23 consists of one node (GW), which is installed in the device.

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 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.

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:
- GAL (noise-dependent loudspeaker boost NLB)
- Increment steps
- Key code
- Tuner parameters
- Status of the optical performance check

NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the CDR23. If this is not done, the system will crash.

Menu item
- GAL (noise-dependent loudspeaker boost - NLB)

Function
You can read out the coded NLB value 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 CDR23 in the 911 (996) PCM2 function selection menu and confirm with the >> key.
- Select Input signals in the 911 (996) CDR23 function selection menu and confirm with the >> key.
- Select GAL (noise-dependent loudspeaker boost - NLB) in the 911 (996) CDR23 function selection menu and confirm with the >> key.
- The current coded value is displayed in the 911 (996) CDR23 noise-dependent loudspeaker menu.

Menu item
- Increment steps

Function
You can check the function of the CDR23 rotary knobs 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 CDR23 in the 911 (996) PCM2 function selection menu and confirm with the >> key.
- Select Input signals in the CDR23 function selection menu and confirm with the >> key.
- Select Increment steps in the 911 (996) CDR23 Input signals menu and confirm with the >> key.
- The relevant change is displayed by turning the rotary knobs of the CDR23 if this functions correctly.

Menu item
- Key code

Function
You can check the function of the CDR23 operating buttons 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the CDR23 function selection and confirm with the >> key.
- Select Key code in the 911 (996) CDR23 function selection and confirm with the >> key.
- By operating the buttons of the CDR23, the correct function of each key code is displayed.

Menu item
- Tuner parameters

Function
You can check the tuner parameters of the CDR23 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 CDR23 in the 911 (996) PCM function selection and confirm with the >> key.
- Select Input signals in the CDR23 function selection and confirm with the >> key.
- Select Tuner parameters in the 911 (996) CDR23 Input signals function selection and confirm with the >> key.
- The currently coded country code is displayed in the CDR23 Tuner parameters menu.

Menu item
- Status of the optical performance check

Function
You can check the status of the optical waveguides 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the CDR23 function selection and confirm with the >> key.
- Select Key code in the 911 (996) CDR23 input signals function selection and confirm with the >> key.
- Select Status of optical performance check in the CDR23 input signals menu and confirm with the >> key.
- The result can be read out.

Single CD
The CD player is part of the CDR23. It is used to play the audio CD.

Drive links
Drive links of the CDR23 can be activated with this menu item. This allows the function of the drive links to be assessed very quickly using the Porsche System Tester II 9588.

The following drive links can be activated:
- All On display test.
- Loudspeaker test.
- Ring break diagnosis.
- Ring break line diagnosis.
- Set default values.

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

Menu item
- All On display test

Function
You can check the function of the CDR23 display segments 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the 911 (996) CDR23 function selection and confirm with the >> key.
- Select All On display test in the CDR23 drive links function selection and confirm with the >> key.
- Press the F8 key to start the test.
- All segments of the CDR23 display are activated and can be checked for operation.

Menu item
- Loudspeaker test

Function
You can check the function of the loudspeakers connected to the CDR23 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the 911 (996) CDR23 function selection and confirm with the >> key.
- Select Loudspeaker test in the CDR23 drive links function selection and confirm with the >> key.
- Press the F8 key to start the test.

Menu item
- Ring break diagnosis

Function
You can check the function of the diagnosis/wake-up line of the CDR23 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the 911 (996) CDR23 function selection and confirm with the >> key.
- Select Ring break diagnosis in the CDR23 drive links function selection and confirm with the >> key.
- Press the F8 key to start the test.
- The result of the automatic test is displayed on the CDR23 display.

Menu item
- Ring break line diagnosis

Function
You can check the function of the CDR23 display segments 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the 911 (996) CDR23 function selection and confirm with the >> key.
- Select All On display test in the CDR23 drive links function selection and confirm with the >> key.
- Press the F8 key to start the test.
- All segments of the CDR23 display are activated and can be checked for operation.

Menu item
- Set default values

Function
You can check the function of the CDR23 display segments 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 CDR23 in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Drive links in the 911 (996) CDR23 function selection and confirm with the >> key.
- Select Set default values in the CDR23 drive links function selection and confirm with the >> key.
- Press the F8 key to start the test.
pro multis · About Operation CHARM