PCM2 MMI - Introduction

Introduction
The database contains the diagnosis for the following system:

PCM2 - multi-media information (MMI)

General Instructions/Safety Instructions
The following points must be observed during vehicle diagnosis:
- After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the customer must be informed of decoding and the deleted tuner memory.
- Deactivate the 'automatic traffic announcement' before beginning the diagnosis on the PCM2. If this is not done, the system will crash.
- When working on the optical waveguide, please observe the Optical waveguide - MOST bus assembly.
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
- After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again.

DANGER:
Danger of injury through triggering of driver's airbag
- Never hang the Porsche System Tester II No. 9588 over the steering wheel

CAUTION:
Danger of damage due to improper handling of the battery and the control unit connectors
- Never disconnect battery with engine running.
- Never start engine without securely connected battery.
- Never pull off or push on plug connections for the control modules or other electronic components when the ignition is switched on.

General Information On The Fault Memory

Fault code setting conditions
Fault codes can be set in several circumstances, e.g.
- battery disconnected
- plug connections disconnected
- power failure

In these circumstances, no fault is present in the system and the fault memory must be erased.

Fault memory info key F8
In order to be able to assess the fault exactly, the fault memory Info key F8 must be pressed. This information should be saved using the Save key F4 and printed out. If a fault code is stored with "not present" status and no other problems are present, then the fault memory must be erased.

Fault type - Frequency counter/Temperature/Voltage; Speed/Time of occurrence

Fault type The following displays are possible:
EEPROM fault
Tuner communication fault
General communication fault
Key code The key which has caused the fault is displayed in clear text.
Frequency counter When a fault first occurs, a fault entry is made in the fault memory and the counter is simultaneously set to 50. If a fault is present, the counter is incremented by 1 for each "ignition on". The maximum count is 100. The counter is decremented if the fault is no longer present. The fault memory is erased automatically when the counter reaches 0.
First occurrence
(month, day) The date on which the fault was first established is displayed: Month and day.
First occurrence
temperature The value indicates the temperature (temperature sensor in the gateway) at the time the fault occurred. The temperature of the fibre optical transmitter is monitored; max 85 degree C.
First occurrence speed The value indicates the vehicle speed at the time the fault occurred.
First appearance supply
voltage The value indicates the voltage at the time the fault occurred.
First occurrence
hourmeter The value indicates the hours of operation at the time the fault initially occurred.
Last occurrence
(month, day) The date on which the fault was last established is displayed: Month and day.
Last occurrence
temperature The value indicates the temperature (temperature sensor in the gateway) at the time the fault last occurred.
The temperature of the fibre optical transmitter (FOT) is monitored; max. 85%.
Last occurrence supply
voltage The value indicates the voltage at the time the fault last occurred.
Last occurrence
hourmeter The value indicates the hours of operation at the time the fault last occurred.

Vehicle hand-over
The PCM2 is converted into delivery mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster7 roll-over bar), the PCM2 must be activated with the Porsche System Tester II No. 9588.
1. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
2. Select the menu item 'Special functions' and press the key >>.
3. Select the menu item 'Vehicle hand-over' and press the key >>.
4. Follow the Instructions of the Porsche System Tester II No. 9588.

Country-specific Tuner Settings
The following country-specific tuner settings can be coded:
- Europe
- North America
- South America
- Australia
- ASIA
- South Africa
- Japan

Coding Country-specific Tuner Settings
1. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
2. Select vehicle type 911 (996) and press the >> key.
3. Select the menu item 'PCM2-GW' and press the >> key.
4. Select the 'Coding' menu item and press the >> key.
5. Select the 'Country coding' menu item and press the >> key.
6. Extract country-specific code from table and enter it in the form. Code with the F8 key.

Coding PCM2
1. Connect and start the Porsche System Tester II No. 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 selection and confirm with the >> key.
4. Select 'PCM2/CDR23' in the control modules selection and confirm with the >> key.
5. Confirm 'PCM2-GW' in the PCM2/CDR23 function selection and confirm with the >> key.
6. Select 'Coding' in the PCM2-GW function selection and confirm with the >> key.
7. Select 'PCM2Code' in the PCM2-GW coding and confirm with the >> key.
8. Take the PCM2 code from 'IPAS' and enter it in the form. Code with the F8 key.

Replacing Control Module PCM2
The PCM2 is provided in 'active production mode' in new vehicles and as a spare part. Each time the vehicle is started, the model range code that is stored is compared with the code in the instrument cluster. If no match is found, the device switches off after 30 seconds and the 'PROTECTED' message appears in the display. The device is not operational.

If a match is found, the device is operational. No further checks are carried out as long as the device is not disconnected from the vehicle electrical system.