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8007 CDR23: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (8007 CDR23)

Work instruction Display OK If not OK
1 Reading out CDR23 fault memory
  • Connect the Porsche System Tester II 9588 to the diagnostic socket; switch on the ignition and the Porsche System Tester II 9588.
  • Select vehicle type 911 (996) and start the automatic control module search.
  • In the Control units menu, select CDR23.
  • Click the "> >" key in the Fault memory menu.
  • Read out fault memory.
  • Erase fault memory.
  • Remove ignition key and switch on ignition again.
  • Read out fault memory.
  • Extract ambient data, press the ">>" key.
 The fault is remedied.
-> End		 Fault code is still displayed.
Step 2
2 Checking MOST components
  • In the Control units menu, select CDR23.
  • Click MOST components check in the function selection menu and start it with the ">>" key.
  • Wait for the end of the automatic check.
  • The duration of the check depends on the number of existing MOST control modules.
  • Press the ">>" key.
  • CDR23 > amplifier optically OK electrically OK.
  • Amplifier > CD changer optically OK electrically OK.
  • CD changer > CDR23 optically OK electrically OK.
 An optical fault is displayed.
3
An electrical fault is displayed.
4
3 Optical fault Replace the relevant optical waveguide between the listed faulty components with the optical waveguide test line 9712 that is provided as a special tool. Check MOST components again. Replace the faulty optical wavelength with the relevant spare part.
-> End		 Replace the relevant receiving MOST control module.
Step 2
4 Checking open circuit in diagnosis distribution line Check diagnosis distribution line between the listed faulty components for an open circuit.
  • Switch off ignition.
  • Disconnect the plug connections from the existing MOST control modules.
  • Measure the resistance of the diagnosis distribution line between the relevant plug connections.
 < 0.5
Step 5		 Remove open circuit in diagnosis distribution line.
-> End
5 Checking diagnosis distribution line for short circuit to ground Check diagnosis distribution line between the listed faulty components for short circuit to ground.
  • Switch off ignition.
  • Disconnect the plug connections from the existing MOST control modules.
  • Measure the resistance of the diagnosis distribution line to the ground body.
 Step 6 Remove short circuit to ground in diagnosis distribution line.
-> End
6 Checking diagnosis distribution line for short circuit to B+. Check diagnosis distribution line between the listed faulty components for short circuit to B+.
  • Switch off ignition.
  • Disconnect the plug connections from the existing MOST control modules.
  • Measure the voltage of the diagnosis distribution line to the ground body.
  • Switch ignition on.
 0 V
Step 7		 Remove short circuit to B+ in diagnosis distribution line.
-> End
7 Replacing PCM2 -> End -
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