Porsche 996 TT, Repair Manual

Page: 385 / 2099

ground which is always available for RHD or LHD versions.
3. Remove ground strap from the body and secure against contact with the body. The on−board current now
flows via the ammeter.
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Measurement
Select a measuring range which ensures that the pointer of the instrument is in the upper third of the
scale, as far as possible. Switch over measuring range without interruption. Read off the measured
values only after the waiting period specified in the table. •
Do not switch on any electrical consumers during the measurement (open central locking system,
etc.). •
Note
If the value of the closed−circuit current is higher than the value determined in the table, the cause
must be established. •
The recommended procedure for troubleshooting: With the measuring device connected, pull off the
fuses of terminal 30 and the relays successively. When disconnecting, observe the display values of
the measuring device to detect a reduction in current.
•
After troubleshooting, screw the ground strap back on to the body in the proper manner. •
The measured values may deviate by approx. 20%. •
The values listed in the table depend on the condition of the battery, the ambient temperature and the
engine temperature. •
Reading off the measuring range:
Read off the measuring range only when at least 61 minutes have passed since the vehicle was locked. •
From To mA
0 min. 5 min. Up to approx. 950
6 min. 15 min. Up to approx. 900
16 min. 20 min. Up to approx. 750
21 min. 60 min. Up to approx. 50
61 min. Until battery empty Up to approx. 30
Control module Equipment
Closed−circuit current in
mA
Generator Standard 0.5
DME Standard 0.3
Instrument cluster Standard 1.4
Immobilizer/central locking Standard 13
einordnung
Connecting measuring device 322