Heater, Diagnosis - 911 CARRERA (996)

• System H 01
  • System description
    • Heating section
    • Air-conditioning section
  • General information
    • Function of auto recirculation
    • Control of the air-conditioning compressor
    • Switch-on conditions for coolant or condenser blower motors
    • Switch-on conditions for engine compartment fan
    • After-running of engine compartment fan
  • Component arrangement
  • Function, individual components
  • Tools
  • Connector assignment, heating/air-conditioning control
  • Identification
  • Fault memory
    • Overview of possible faults
  • Fault overview
    • Notes
    • Test point 1
      • Fault code 20
      • Possible causes, elimination, notes
    • Test point 2
      • Fault code 21
      • Possible causes, elimination, notes
    • Test point 3
      • Fault code 22
      • Possible causes, elimination, notes
    • Test point 4
      • Fault code 23
      • Possible causes, elimination, notes
    • Test point 5
      • Fault code 24
      • Possible causes, elimination, notes
    • Test point 6
      • Fault code 25
      • Possible causes, elimination, notes
    • Test point 7
      • Fault code 26
      • Possible causes, elimination, notes
    • Test point 8
      • Fault code 27
      • Possible causes, elimination, notes
    • Test point 9
      • Fault code 28
      • Possible causes, elimination, notes
    • Test point 10
      • Fault code 29
      • Possible causes, elimination, notes
    • Test point 11
      • Fault code 30
      • Possible causes, elimination, notes
    • Test point 12
      • Fault code 31
      • Possible causes, elimination, notes
    • Test point 13
      • Fault code 32
      • Possible causes, elimination, notes
    • Test point 14
      • Fault code 33
      • Possible causes, elimination, notes
  • Erasing the fault memory
  • Drive links
  • Input signals
  • Actual values
  • System test
• System H02 Introduction - as of MY 2002
  • Notes
  • General instructions/safety instructions
  • Establishing communication
  • General information on the fault memory
  • Diagnostic conditions
  • Possible causes of fault
  • Diagnosis/troubleshooting
    • Notes
    • Fault type
    • Occurrence of faults
    • Fault status
• Tools - as of MY 2002
• Component arrangement - as of MY 2002
• Connector assignment - as of MY 2002
  • Connector assignment for air-conditioning control module
• Control module function - as of MY 2002
  • Replacing the air-conditioning system regulator and flashing display
  • System test
  • Modify coding
• Fault overview - as of MY 2002
• Fault code 21 - as of MY 2002
  • Outside temperature sensor - short circuit to B+/short circuit to ground
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 22 - as of MY 2002
  • Inside temperature sensor - short circuit to B+/short circuit to ground
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 23 - as of MY 2002
  • Footwell blower outlet sensor - Open circuit/ground short
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 24 - as of MY 2002
  • Supply voltage (terminal 15) - Voltage too high/too low
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 25 - as of MY 2002
  • Supply voltage sensors (5 V) - too high/too low/short circuit to B+/ground short
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 26 - as of MY 2002
  • Temperature mixing valve motor - No reaction to activation, signal unclear
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 27 - as of MY 2002
  • Central flap motor - No reaction to activation, signal unclear
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 28 - as of MY 2002
  • Footwell/defrost valve motor - No reaction to activation, signal unclear
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 29 - as of MY 2002
  • Outside air/bypass air flap motor - No reaction to activation, signal unclear
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 30 - as of MY 2002
  • AC - signal unclear
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 31 - as of MY 2002
  • Fresh-air blower motor - voltage deviation too small/too large
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 32 - as of MY 2002
  • Control unit - control unit faulty
    • Diagnostic conditions
    • Possible cause of fault
    • Diagnosis/troubleshooting
• Fault code 34 - as of MY 2002
  • Notes
  • Air-conditioning CAN Bus off
    • Notes
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 35 - as of MY 2002
  • Interface for instrument cluster (see Instrument cluster FS)
    • Notes
    • Diagnostic conditions
    • Possible cause of fault
    • Diagnosis/troubleshooting
• Fault code 36 - as of MY 2002
  • CAN-timeout instrument cluster
    • Notes
    • Diagnostic conditions
    • Possible cause of fault
    • Affected pins
    • Diagnosis/troubleshooting
• Fault code 37 - as of MY 2002
  • CAN signal for PCM
    • Notes
    • Diagnostic conditions
    • Possible cause of fault
    • Diagnosis/troubleshooting
• Fault code 38 - as of MY 2002
  • CAN timeout for PCM
    • Notes
    • Diagnostic conditions
    • Possible cause of fault
    • Diagnosis/troubleshooting