Boxster (986) F6-2.5L (1998)
All control units connected to the MOST are in sleep mode if the PCM2 is deactivated. 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.
External Harman Amplifier - Introduction
Introduction - External Harman Amplifier
The manual contains the diagnosis for the following system:
External Harman amplifier
General Instructions/Safety Instructions
The following points must be observed during vehicle diagnosis:
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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.
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Deactivate the 'automatic traffic announcement' before beginning the diagnosis on the PCM2. If this is not done, the system will crash.
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When working on the optical waveguide, please observe the instructions in assembly.
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After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
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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
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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.
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Never disconnect battery with engine running.
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Never start engine without securely connected battery.
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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.:
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battery disconnected
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plug connections disconnected
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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.
Open circuit - short to ground/voltage short/version; vehicle parameters/counter
Supply voltage fault type
The display shows which fault type has occurred:
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no fault type
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not present
Lock status of MOST ring
The display shows which fault type has occurred:
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lock
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unlock
Supply voltage
The value indicates the voltage at the time the fault occurred.
Fault 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 255.
The counter is decremented if the fault is no longer present. The fault memory is automatically erased when the counter
reaches 0.
If the error occurs again when the counter is between 1 and 49, the counter is reset to 50.