Porshe 911 (997). Manual - part 1217

ADVERTENCIA

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Por motivos técnicos, por el momento no se puede descartar que, aun siendo
correcta la imagen que aparezca en la pantalla, al imprimir se pierda la
correlación entre el texto y la figura correspondiente.

• 

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ejecuten de forma correcta y, por tanto, se produzcan daños personales y
materiales.

• 

→ Por ello le rogamos que tras el proceso de impresión compare siempre las copias impresas con
la imagen de la pantalla. En caso de error, corrija las copias impresas de forma que se
correspondan con el contenido de la imagen de la pantalla.

Diagnostic system: reading out fault memory and activating systems

Vehicle electrical system - switching off

5025

97 IN Measurement of closed-circuit current - as of
MY 2005

- Tools and materials
- Measurement of closed-circuit current

Tools

Designation

Type

Number

Explanation

Multimeter

commercially available tool

155

Tools and materials

Tools

Closed-circuit current should be measured using an analogue ammeter or a digital multimeter with a long
integration time (to filter out voltage peaks).

Item

Special tool designation

Explanation

-1-

Multimeter 155

→ "Gr. 2,5; Workshop Equipment Manual "

5026

Measurement of closed-circuit current

Preliminary work on vehicle

Note

Before measuring the closed-circuit current, determine the vehicle equipment (I numbers) and establish the
expected closed-circuit current with the aid of the attached table.

1. Open the front luggage compartment.

2. Using a suitable tool, e.g. upper part of lock with a suitable handle, close lower part of luggage

compartment lock while keeping the luggage compartment lid open.

3. Remove ignition key, close doors and rear lid, do not lock vehicle.

4. Set the measuring instrument to the highest possible

current-measuring range.

5. With two alligator clips, connect the measuring instrument to the battery ground and to the

unoccupied second body ground which is always available for RHD or LHD.

6. Remove ground strap from the body and secure against contact with the body. The entire vehicle current

now flows through the ammeter.

Testing

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 measuring values after the
waiting period specified in the table.
Do not switch on any electrical loads when measuring.

Note

If the value of the closed-circuit current is higher than the value determined in the table, the cause
must be established systematically.

• 

Recommended troubleshooting procedure: With the measuring device connected, remove the fuses of
terminal 30 and the relays successively. Observe the display values of the measuring instrument when
removing in order to recognise a reduction in current.

• 

After troubleshooting, screw the ground strap back onto the body in the proper manner.

• 

The measured values could vary by approx. 20%.

• 

The values listed in the table depend on the condition of the battery, the room temperature and the
engine temperature.

• 

Diagnostic system: reading out fault memory and activating systems

Tools

5027

Reading off the measuring range:
Read off the measuring range only after at least 60 minutes have passed since locking the vehicle.

From

to

mA

Approx. 60 min

until battery is empty

up to approx.

Control unit

Equipment

Closed-circuit current in

mA

System reaches

closed-circuit current after

X sec

Generator

Standard

0.3

instantaneous

DME

Standard

0.31

66

Instrument cluster

Standard

1.75

958

Driver ID/PAS

Standard

0.8

223

Passenger compartment sensor

I No.

1.93

60

Tilt sensor

I No.

1.15

instantaneous

Door control unit, right

Standard

0.1

221

Door control unit, left

Standard

0.1

221

Tiptronic*

I No.

0.4

On-board control unit

Standard

0.41

226

PSM

Standard

0.1

61

Front end control unit

Standard

0.52

226

CD changer

I No.

0.25

80

Bose amplifier

I No.

0.47

226

Navi DVD

I No.

3.18

117

ASK sound package

I No.

0.1

PCM

I No.

0.59

308

Telephone

I No.

0.15

104

Seat memory, both

I No.

0.15

221

Air-conditioning control unit

Standard

0.1

3506

Ignition lock

Standard

0.1

instantaneous

Gateway control unit

Standard

0.1

308

Rear control unit

Standard

1.27

222

Steering column module

Standard

0.71

221

Fan control unit

Standard

0.1

instantaneous

PASM

I No.

0.1

62

RDK (tyre pressure monitoring
system)

I No.

0.12

221

Sport Chrono

I No.

0.1

308

Alarm siren

I No.

0.2

Diagnostic system: reading out fault memory and activating systems

Testing

5028