PCM2 MMI - Introduction

PCM2 MMI - Introduction
The manual 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 instructions in 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 again with the Porsche System Tester II No. 9588.

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 unless battery is connected securely.
- 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 the status "not present" and no other problems are present, the fault memory must be erased.

Fault type - Frequency counter/Temperature/Voltage; Speed/Time of occurrence
Fault type The following display types are available:
- EEPROM fault
- Tuner communication fault
- General communication fault

Key code The button which has caused the fault is displayed in plain text.
Frequency counter When a fault first occurs, a fault entry with the status present" is set in the fault memory and the counter is simultaneously set to "50".
If a fault is present, the counter is incremented by one whenever the system is "booted". The maximum count is 255.
The counter is decremented if the status "fault no longer present" is entered and the fault does not occur again when the system is "booted". The entry in the fault memory is erased automatically when the counter reaches 0.
If the error occurs again when the counter is between 1 and 49, the counter is reset to 50.
First occurrence (month, day) The date (month and day) on which the fault was first detected is displayed
Temperature - first occurrence The value indicates the temperature (temperature sensor in the gateway) at the time the fault occurred. The temperature of the fibre optic transmitter is monitored: max 85 degree C.
Speed - first occurrence The value indicates the vehicle speed at the time the fault occurred.
Supply voltage - first
occurrence The value indicates the voltage at the time the fault occurred.
Hourmeter - first occurrence The value indicates the operating hours at the time the fault first occurred.
Last occurrence (month, day) The date (month and day) on which the fault was last detected is displayed.
Temperature - last occurrence The value indicates the temperature (temperature sensor in the gateway) at the time the fault was last detected.
The temperature of the fibre optic transmitter (FOT) is monitored: max 85 degree C.
Supply voltage - last
occurrence The value indicates the voltage at the time the fault last occurred.
Hourmeter - last occurrence The value indicates the operating hours at the time the fault was last detected.

Vehicle hand-over
The PCM2 is converted to delivery mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster, 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 "Special functions" in the Vehicle type menu and press the >> key,
3. Select "Vehicle hand-over" in the Control units menu and confirm with 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 "911 (996)" in the Vehicle type menu and confirm with the >> key.
3. Select "PCM" in the Control units menu and confirm with the >> key.
4. Select "PCM2 GW" in the 911 (996) PCM2 function selection and confirm with the >> key.
5. Select "Coding" in the 911 (996) PCM2 GW function selection and confirm with the >> key.
6. Select "Country coding" in the PCM2 GW Coding function selection and confirm with the >> key.
7. Take the country-specific code as it appears in the table, enter it in the form and 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 units menu and confirm with the >> key.
4. Select "PCM2 GW" in the PCM2 function selection and confirm with the >> key.
5. Select "Coding" in the PCM2 GW function selection and confirm with the >> key.
6. Select "PCM2 code" in the PCM2 GW coding and confirm with the >> key.
7. Take the PCM2 code from "IPAS", enter it in the form and code with the F8 key.

Control Module Replacement - PCM2
The PCM2 is supplied 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 made while the device is connected to the vehicle electrical system.