8009 CDR23: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (8009 CDR23)

Work instruction			Display OK	If not OK
1	MOST component check runs automatically	Connect the Porsche System Tester II 9588 to the diagnostic socket, start it and switch on the ignition Select 911 (996) in the Vehicle type menu and confirm with the "FORWORD" key. Select CDR23 in the Control units menu and confirm with the "FORWORD" key. Select MOST components check in the PCM2 function selection and confirm with the "FORWORD" key. Follow the instructions of the tester	The following text is displayed: Test successfully completed. No faults found -> End	Tester displays an optical fault: Under Faulty device, the tester displays the relevant MOST control module from which a corresponding signal is not recognized Step 2 Tester displays an electrical fault Step 7
2	Open circuit in MOST, optical	Replace the optical waveguide for the MOST control module with the optical waveguide test line 9712 Clear fault memory 8009 Select MOST components check and start it again with the "FORWORD" key Follow the instructions of the tester	The following text is displayed: Test successfully completed. No faults found Step 3	Step 4
3	Replace the optical waveguide		-> End
4	Open circuit in MOST, optical	If an MMI or GW fault is displayed under step 1. Connect optical output with the optical input of the MOST control module which is installed before the CDR23 with the optical waveguide test line 9712 If only 1 external MOST control module is present and fault memory entry under step 1 is not MMI or GW: Otherwise Connect the optical waveguide test line 9712 with the following Most control module displayed under step 1 (do not change the input of the optical waveguide test line). After installation Optical waveguide test line 9712: Clear fault memory 8009 Select MOST components check and start it again with the "FORWORD" key. Follow the instructions of the tester	If an MMI or GW fault is displayed under step 1: fault memory entry 8009 = MMI or GW Step 5 If only 1 external MOST control module is present and fault memory entry under step 1 is not MMI or GW: fault memory entry 8009 = MMI or GW Step 6 Otherwise: The following text is displayed: Test successfully completed. No faults found. Step 6 -> End	If an MMI or GW fault is displayed under step 1: fault memory entry 8009 is not MMI or GW Step 6 If only 1 external MOST control module is present and fault memory entry under step 1 is not MMI or GW: fault memory entry 8009 is not MMI or GW Step 5 Otherwise: Step 7
5	Replace the control module displayed under step 1.		-> End
6	Replace the control module before the one displayed under step 1.		-> End
7	Check the power supply of the displayed control module		Step 6	Repair -> End
8	Check wiring of the ring break diagnosis line		Step 6	Repair -> End
9	Replace displayed control module		-> End