Protection Against Overvoltage; Replacing Control Modules - Porsche 996 TT Repair Manual

Protection against overvoltage

To protect electronic control units from overvoltage during electric arc welding, the following work
regulations must be observed:
When welding work is extensive, the electronic control units must be removed. Ensure that there are
•
no electrically insulated parts between the ground connection and the welding point.
• Remove clamp from negative terminal of battery and cover negative terminal of battery.
• Connect the ground connection of the electric arc welding equipment as near as possible to the
welding point on the part to be welded.
Do not touch electronic control units or electric cables with the ground connection or the welding
•
electrode.

Replacing control modules

The replacement of electronic control modules after an accident is necessary if at least one of the following
conditions is met:
• The housing is noticeably deformed or damaged.
• The supporting surface or bracket is deformed (the unit shows no external damage).
• The plug connection is damaged or corroded by moisture.
• Functional checks or self−diagnosis of the unit reveals the fault "Control module faulty".
996420, 996421, 996450, 996451, 996430, 996431, 996620, 996621, 996650, 996651, 996630, 996631,
Protection against overvoltage
einordnung
996840, 996841
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