Interference Noise Due To Antenna - Porsche 996 TT Repair Manual

2
3. Check for faults caused by
vehicle components which have
an influence on the speed.
4. Disconnect the component from
the power supply and test again.
Noise still present?
3
8. Check the wiring of the
components for unfavourable
positioning and loose or corroded
connections.
9. Lay the leads again or repair.
Noise still present?

Interference noise due to antenna

Note
• Follow this test routine if the interference noises come from the antenna.
• As an experiment, it is worth making a comparison by inserting a rod antenna.
Work instruction
1
1. Clean all connections.
2. Connect a ground strap to the
antenna plug.
3. Connect the other end of the ground
strap to a suitable point on the car
body.
4. Check the ground connection
Interference noises due to engine
einordnung
Check the lead connections to the
injection nozzle. Check in particular for
loose or corroded connections.
2. Check resistance of the injection
nozzles. R = 12 Ohm +/− 0.6 Ohm.
Noise no longer present ' End
Noise present ' Check the points listed
above under Note once more.
5. Check the wiring of the
components for unfavourable
positioning and loose or corroded
connections.
6. Lay the cables again or repair.
7. As an experiment, insert a functional
component and replace, if necessary.
' End
As an experiment, insert a functional
component and replace, if necessary
' End
Yes
5. Check all antenna mountings for good
ground connections with the negative
terminal of the battery.
6. Check all hardware mountings for firm
seating and clean ground connections.
Noise present ' Step 2
Noise not present ' End
Does the noise
not occur
when the car is
driving?
' Step 3
Check the
radio reception
' End
' End
No
' End
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