Introduction

Introduction

The manual contains the diagnosis for the following system:
Air-conditioning H01 and H02

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.
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester 2 and carry out a test drive.
- After the test drive, read out the fault memory with Porsche System Tester 2 again.

DANGER:
- Danger of injury through triggering of driver's airbag
- Never hang PST 2 over the steering wheel.

CAUTION: Danger of damage due to improper handling of the battery and the control module connectors.

- Never disconnect battery with engine running.
- Never start engine without securely connected battery.
- Never pull off or push on plug connections of 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
- etc.

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.

After completing repair work, read out fault memory, press Info key, switch off ignition and switch on again. After a short period, the fault memory text goes from "present" to "not present", if the fault has actually been remedied.

Open circuit - short to ground / voltage short / version; vehicle parameters / counter
Open circuit or short to ground: There is (present) or was (not present) a short circuit to ground or an open circuit in the circuit to the control module terminal.
Voltage short: There is (present) or was (not present) a short circuit to voltage.