Initial Inspection and Diagnostic Overview

Introduction

911 Carrera (996) as of model year 2003

System V 04

NOTE:
- The control unit996.618.111.04 and all subsequently interpreted control units with diagnostic software number V 04 can be retrofitted, also for 911 Carrera (996) vehicles up to model year 2002.
- To do this, the coding must be changed, see 'Coding'.
- This function is only present starting with software version V 18.0 in the Porsche System Tester II 9588.

General instructions/safety instructions
The following points must be observed during vehicle diagnosis:
- When replacing the convertible top control unit, the coding must be performed correctly and the convertible top is to be recalibrated.

After troubleshooting or repairs.
- Delete fault memory with the Porsche System Tester II 9588,
- Completely open and close convertible top 3 times using the convertible top switch, remote control (not USA) or comfort opening/closing function,
- Carry out a test drive and completely open and close the convertible top 3 times,
- Read out fault memory again with the Porsche System Tester II 9588,
- Rectify entered faults if necessary,
- Reset warning lights.

CAUTION:
- Danger of damage due to improper handling of batteries and control module plug connections.
- Disconnect the battery connection terminals only when the engine is switched off.
- Start the engine only when the battery connection terminals are properly connected.
- Pull off or push on plug connections for the control units or other electronic components only when the ignition is switched off.
- Disconnect the negative terminal of the battery before welding work on the vehicle.

General information on the fault memory
- The contents of the fault memory are retained even when the unit is removed.

Diagnostic conditions
The fault can only be identified if the requirements listed under Diagnostic condition are met. For this reason, the specified procedure must be observed after a fault is repaired.
1. Clear fault memory
2. Satisfy the requirements listed under Diagnostic conditions.
3. Read out fault memory again

Possible Causes of fault
The possible causes that may be responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After repairs using the automatic control unit search have been made, read out the fault memory of all control units and delete the faults entered as a result of the troubleshooting and repairs.

Diagnosis/troubleshooting
- The errors entered are indicated using the Porsche fault code and as clear text.
- The fault memory Info key F8 on the Porsche System Tester II 9588 can be used to access the extended fault memory. This information should be saved using the F4 key and printed out. The following information can be displayed.

Fault status
The following status types are possible:
- available (at the time of the last diagnosis routine)
- not available (at the time of the last diagnosis routine)

Counter
- The counter is set to 50 the first time the fault occurs. (Fault present)
- If the fault occurs in each diagnosis routine (convertible top operation), the counter remains at 50. (Fault present)
- If the fault has been detected following a diagnosis routine (convertible top operation) in which there were no faults present, the counter is increased by 1 each time.

Basic conditions
The switches that were recognized as being actuated in the last troubleshooting are displayed.

The following displays are possible but are not required:
- Closure locked
- Closure unlocked
- Convertible top raised
- Convertible-top compartment lid locked
- Side flap top right
- Side flap bottom right
- Side flap top left
- Side flap bottom left