Audi A3 1997 - Page 89

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Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
3.5 Connector
A contact 8
and
connector
A, contact 6
"Compressor ON"
signal from -E87
▪ Engine running
▪ Operating and dis‐
play unit -E87 in "au‐
to" mode (compres‐
sor on)
- approx. battery
voltage
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit or short to posi‐
tive or earth in the
wiring between -
J293 and -E87.
Eliminate cause of
compressor shutoff
condition
Test step 4 (signal from high-pressure sensor -G65)
Vehicle diagnosis system VAS 5051 (or commercially available oscilloscope)
"DSO" (digital storage oscilloscope) measurement system
Setting 2V/Div =, 5ms/Div (2 V DC and 5 milliseconds per unit)
Test step Contact at
connector to
-J293
Testing of ▪ Test conditions
- Additional oper‐
ations
Specified value Remedies if speci‐
fied value not at‐
tained
4.0 Connector A
contact 2
(signal)
and
connector A,
contact 6
(earth)
Pressure-dependent
square-wave signal
from sender -G65
▪ Ignition on. - Square-wave signal
(dependent on pres‐
sure in refrigerant cir‐
cuit =>Page 85
- Use current flow
diagram to check
voltage supply and
earth connections
to High-pressure
sensor -G65.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween High-pres‐
sure sensor -G65
and control unit -
J293.
(cont.)
▼
Vehicle diagnosis system VAS 5051 (or commercially available oscilloscope)
"DSO" (digital storage oscilloscope) measurement system
Setting 2V/Div =, 5ms/Div (2 V DC and 5 milliseconds per unit)
Test step Contact at con‐
nector to -J293
Testing of ▪ Test conditions
- Additional operations
Specified value Remedies if specified value
not attained
4.0
(cont.)
- Use circuit flow diagram to
locate and rectify short cir‐
cuit in the wiring from -G65
to -J293 or to the engine
control unit.
High-pressure sensor -G65
defective - replace.
Notes:
◆ The signal from high-pressure sensor -G65 depends on pressure in refrigerant circuit => Page 85
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65) 83