Email:contact@Porsche911.tips
Porsche 911 Maintenance Service
FREN
Home/Procedures/ All-Wheel Drive and ABS Indicator Lights On in the Carrera 4

All-Wheel Drive and ABS Indicator Lights On in the Carrera 4

Export / print as PDF
Figure 10.1 — Two distributor caps and their ignition points removed for inspection.
Figure 1 — Two distributor caps and their ignition points removed for inspection.

Overview

Figure 10.2 — Electrical terminals on the distributor caps showing corrosion and deposits.
Figure 2 — Electrical terminals on the distributor heads showing corrosion and deposits.

Inspection of Distributor Pins

The circled areas show significant oxidation. Compare the two heads, check for cracks, and inspect the condition of the center contacts.

Figure 10.3 — Comparison of the corroded studs on the two valve heads.
Figure 3 — Comparison of the corroded studs on the two valve heads.

Explanation

Figure 10.4 — Central and peripheral contacts showing signs of arcing.
Figure 4 — Central and peripheral contacts showing signs of arcing.

Electric Arc Marks

Arcing occurs at the central and peripheral contacts. These faults warrant the replacement of the affected ignition components.

Figure 10.5 — Ignition finger with a worn and marked terminal contact.
Figure 5 — Ignition finger with a worn and marked terminal contact.

Explanation

Electromagnetic disturbances can propagate along a cable, but their exact role must be demonstrated through measurements. After replacing the ignition components, clear any fault codes if the procedure calls for it, and verify that the warning lights do not reappear.

Suggest an improvement