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- Switch ignition off.
4-pin connector on
wiring harness, socket
Specification
1 + earth
Battery voltage
- Switch ignition on.
4-pin connector on
wiring harness, socket
Specification
3 + earth
Battery voltage
If specifications are met:
- Test wiring connections => Page
.
If specifications are not met:
- Test wiring connections from sockets 1 and 3 of connector for open circuit or short to earth.
=> Current flow diagrams, Electrical fault finding and fitting locations binder
- Rectify any open/short circuit as necessary.
Checking wiring connections
- Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine
control unit itself.
.
Test the following wiring connections for open circuits and short to positive or earth:
4-pin connector on
wiring harness, socket
Test box V.A.G 1598/31, sock‐
et
2
56
4
55
Resistance in wiring: max. 1.5 ω
=> Current flow diagrams, Electrical fault finding and fitting locations binder
- Rectify any open/short circuit as necessary.
If no open circuits are found in wiring:
- Renew brake light switch / brake pedal switch.
7.3 - Testing clutch pedal switch -F36
This signal prevents engine speed fluctuations and load change jolts when the clutch is disengaged. The signal
is also required for the cruise control system.
- Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and
select engine electronics control unit by entering address word "01" ( => Page
.)
When doing this the ignition must be switched on.
-> Indicated on display:
Rapid data transfer HELP
Select function XX
Audi A8 1994 ➤
Motronic injection and ignition system (6-cylinder) - Edition 02.1999
7.2 - Checking brake light switch -F and brake pedal switch -F47
85