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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1499 (Heating & Air Conditioning (On Board Diagnostic)) >> 01 On Board Diagnostic (OBD) >> Automatic Climate Control System, electrical testing >> Test steps "5" to "9" >> Test step "5"

Test step "5"

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Pressure signal from High Pressure Sensor G65 

Diagnostic Operation System VAS 5051A, measurement mode: DSO (Digital Storage Oscilloscope) Setting 5V/div DC, 5 ms/div (5 V DC and 5 milliseconds per unit)
  • Adapter - 16 Terminals V.A.G 1598/12 connected
Test step Test Box V.A.G 1598A socket Test of
  • Test requirements 
  • Additional operations
 Specified value Corrective actions for deviations from specification
5.1 7 + 13 Pressure-sensitive square-wave signal from High Pressure Sensor G65
  • Ignition switched on
  • Engine not running
  • Ambient temperature greater than 20 °C and less than 35 °C
  • Square-wave signal (as a function of pressure in refrigerant circuit)
  • Duty cycle greater than 16.5 % and less than 50%
  • No signal detection
  • Check power supply and Ground (GND) connection to High Pressure Sensor G65.
  • Use wiring diagram to locate and eliminate open circuit in wiring, contact resistance or short circuit between operating and display module, Climatronic Control Module J255 and High Pressure Sensor G65
  • Replace High Pressure Sensor G65
Diagnostic Operation System VAS 5051A, measurement mode: DSO (Digital Storage Oscilloscope) Setting 5V/div DC, 5 ms/div (5 V DC and 5 milliseconds per unit)
  • Adapter - 16 Terminals V.A.G 1598/12 connected
Test step Test Box V.A.G 1598A socket Test of
  • Test requirements 
  • Additional operations
 Specified value Corrective actions for deviations from specification
5.1 (continued) 7 + 13 Pressure-sensitive square-wave signal from High Pressure Sensor G65
  • Ignition switched on
  • Engine not running
  • Ambient temperature greater than 20 °C and less than 35 °C
  
  • Duty cycle less than 5% or greater than 95%
  • Check power supply and Ground (GND) connection to High Pressure Sensor G65.
  • High Pressure Sensor G65 defective, replace
  • Duty cycle greater than 5% and less than 16.5 %
Diagnostic Operation System VAS 5051A, measurement mode: DSO (Digital Storage Oscilloscope) Setting 5V/div DC, 5 ms/div (5 V DC and 5 milliseconds per unit)
  • Adapter - 16 Terminals V.A.G 1598/12 connected
Test step Test Box V.A.G 1598A socket Test of
  • Test requirements 
  • Additional operations
 Specified value Corrective actions for deviations from specification
5.1 (continued) 7 + 13 Pressure-sensitive square-wave signal from High Pressure Sensor G65
  • Ignition switched on
  • Engine not running
  • Ambient temperature greater than 20 °C and less than 35 °C
  
  • Duty cycle greater than 50% or less than 16.5%
  • High Pressure Sensor G65 defective, replace
  • Malfunction in refrigerant circuit → Refrigerant Circuit
NOTE:
  • If the refrigerant circuit is filled with the correct amount of refrigerant, the pressure and thus the duty cycle change with ambient temperature.
  • The duty cycle and the pressure calculated by the operating and display module, Climatronic Control Module J255 are displayed in the measuring value block (display group "001") → Read Measuring Value Block (function 08) .
  • The signal transmitted at a refrigerant circuit pressure of approx. 5 to 6 bar absolute corresponds to a duty cycle of approx. 22%, which is achieved with the compressor not running, at an ambient temperature of 20 °C and with the refrigerant circuit properly charged.
  • The signal transmitted at a refrigerant circuit pressure of approx. 16 bar absolute corresponds to a duty cycle of approx. 50 %. With the compressor not in operation, this is only achieved under extreme conditions (e.g. very high ambient temperatures and a hot engine).
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