Diagnosis, open circuit in distribution line (ignition on.)
This check must only be carried out when the engine is not running.
| Menu item | Function |
|---|---|
| Diagnonsis, ring break diagnosis (ignition on.) | The ring break diagnosis carries out the following checks: Gateway start-up condition is read out. MOST installed components list (required and actual installed components list) is analysed. Start the ring break diagnosis. The results are displayed by the Porsche System Tester II No. 9588. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'MOST components check' in the PCM2 function selection and confirm with the [>>] key. Select "Ring break diagnosis (top)" in the Cayenne PCM2 MOST components check function selection and confirm with the [>>] key. Follow the instructions of the tester. |
DIAGNOSIS, OPEN CIRCUIT IN DISTRIBUTION LINE (IGNITION ON) REFERENCE
Ring break diagnosis (with engine running)
| Menu item | Function |
|---|---|
| Ring break diagnosis (with engine running) | Using this menu item, a ring break diagnosis can be carried out (with the engine running). Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 GW' in the PCM2 function selection and confirm with the [>>] key. Select 'MOST components check' in the PCM2 GW function selection and confirm with the [>>] key. Select "Ring break diagnosis (with the engine running)" in the Cayenne PCM2 GW MOST components function selection and confirm with the [>>] key. |
RING BREAK DIAGNOSIS REFERENCE (WITH ENGINE RUNNING)
Ring break diagnosis line
The ring break diagnosis line is an electrical lead, which, as a stub cable, connects the individual MOST control modules in the system with one another. The existing MOST control modules are checked at regular intervals during communication with the control modules via the electrical/optical MOST.
Diagnostic conditions
- Ignition ON.
- PCM2 on.
Diagnosis/troubleshooting on the PCM2
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key In the 'Fault memory' menu, click the [>>] key. Reading out fault memory Erase fault memory Remove ignition key and switch on ignition again. Reading out fault memory Extract ambient data, press the [>>] key | The fault is remedied --> End | Go to Step 2 |
| 2 | Replace PCM2 | The fault is remedied --> End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE ON PCM2
- Ignition ON.
- PCM2 on.
- Manual actuation
Note. Fault code 8003 is recorded if the operating buttons are actuated for '> or =one minute 'or more.
Diagnosis/troubleshooting
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key In the 'Fault memory' menu, click the [>>] key. Read out fault memory. Clear fault memory. Remove ignition key and switch on ignition again Read out fault memory. Extract ambient data, press the [>>] key | > End | Fault code is displayed Go to Step 2 |
| 2 | Replace PCM2 | > End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key Select 'Fault memory' in the PCM2 MMI function selection and confirm with the [>>] key Read out fault memory. Clear fault memory. Remove ignition key and switch on ignition again Read out fault memory. Extract ambient data, press the [>>] key | > End | Fault code is displayed Go to Step 2 |
| 2 | Replace PCM2 | > End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Visual inspection | Check CD for damage and the position of the data page Replace the CD | > End | Go to Step 2 |
| 2 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key Select 'Fault memory' in the PCM2 MMI function selection and confirm with the [>>] key Read out fault memory. Clear 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 Go to Step 2 |
| 3 | Replace PCM2 | The fault is remedied --> End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Visual inspection | Check audio CD for damage and the position of the data page Replace the audio CD | > End | Go to Step 2 |
| 2 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key Select 'Fault memory' in the PCM2 MMI function selection and confirm with the [>>] key Reading out fault memory Erase fault memory Remove ignition key and switch on ignition again. Reading out fault memory Extract ambient data, press the [>>] key | The fault is remedied --> End End | Fault code is still displayed Go to Step 2 |
| 3 | Replace PCM2 | The fault is remedied --> End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2 MMI' in the Control units menu and confirm with the [>>] key Select 'Fault memory' in the PCM2 MMI function selection and confirm with the [>>] key. Follow the 'tester instructions'. Read out fault memory. | 'No fault present' --> End | Fault code is displayed. Go to Step 2 |
| 2 | Check diagnosis ring line for short circuit to ground | Check diagnosis ring line between the listed faulty components for short circuit to ground Switch ignition off. Disconnect the plug connections of the existing MOST control modules Measure the resistance of the diagnosis distribution line to ground If an open circuit is displayed on the MMI, check ring break diagnosis line between PCM2 and any external MOST control module. | Infinity ohms Go to Step 3 | Remove short circuit to ground in diagnosis ring line --> End |
| 3 | Check diagnosis ring line for short circuit to B+ | Check diagnosis ring line between the listed faulty components for short circuit to B+ Switch ignition off. Disconnect the plug connections of the existing MOST control modules Measure the voltage of the diagnosis ring line to ground Switch ignition on. | 0 V Go to Step 4 | Remove short circuit to B+ in diagnosis ring line --> End |
| 4 | Replace PCM2 | > End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | 'MOST component check' runs automatically | In the Control units menu, select 'PCM2' Click 'MOST components check' in the function selection and start it with the [>>] key Follow the 'instructions of the tester' | The following text is displayed: 'Test successfully completed. No faults found.' --> End | Under 'Faulty device', the tester displays the releveant MOST control module from which a corresponding signal is not recognised. Go to Step 2 |
| 2 | Open circuit in MOST, optical | Replace the optical waveguide for the MOST control module with the optical wavelength test line No. 9712 Clear fault memory 8009. Select 'MOST components check' and start it again with the [>>] key Follow the instructions of the tester. | The following text is displayed: 'Test successfully completed. No faults found' Go to Step 3 | Go to Step 4 |
| 3 | Replace the optical waveguide | > End | ||
| 4 | Open circuit in MOST, optical | If MMI or GW fault is displayed under step 1. Connect optical output with the optical input of the MOST control module which is installed in front of the PCM2 with the optical waveguide test line No. 9712. | If MMI or GW fault is displayed under step 1: 'fault memory entry 8009 = MMI or GW' Go to Step 5 | If MMI or GW fault is displayed under step 1: 'fault memory entry 8009 is not MMI or GW' Go to Step 6 |
| If there is only 1 external MOST control module available and fault memory entry under step 1 is not MMI or GW | If there is only 1 external MOST control module available and fault memory entry under step 1 is not MMI or GW: 'fault memory entry 8009 = MMI or GW' Go to Step 6 | If there is only 1 external MOST control module available and fault memory entry under step 1 is not MMI or GW: 'fault memory entry 8009 is not MMI or GW' Go to Step 5 | ||
| Otherwise Connect the optical waveguide test line No. 9712 with the following of the MOST control module displayed under step 1 (do not change the optical waveguide test line input). | Otherwise: The following text is displayed: 'Test successfully completed. No faults found.' Go to End Step 5 | Otherwise: Go to Step 7 | ||
| After installing optical waveguide test line No. 9712: Clear fault memory 8009. Select the MOST components check and start again with the [>>] key. Follow the instructions of the tester. | > End | |||
| 5 | Replace the control module displayed under step 1. | > End | ||
| 6 | Replace the control module in front of the control module displayed under step 1. | > End | ||
| 7 | Check the power supply of the displayed control module. | Go to Step 8 | Repair --> End | |
| 8 | Check wiring of the ring break diagnosis line. | Go to Step 9 | Repair --> End | |
| 9 | Replace displayed control module | > End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition ON.
- PCM2 on.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the Porsche System Tester II No. 9588 to the diagnostic socket, start it and switch on the ignition Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key Select 'Fault memory' in the PCM2 MMI function selection and confirm with the [>>] key Read out fault memory. Clear 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 Go to Step 2 |
| 2 | Replace PCM2 | > End | ||
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
- Ignition on
- PCM2 on
Note. The PCM checks whether the TV tuner sends a 'sync signal' as well as the video signal. This signal is important for picture formation.
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out the PCM2 MMI fault memory | Connect the 9588 Porsche System Tester II to the diagnostic socket, start it and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key Select 'PCM2' in the Control units menu and confirm with the [>>] key Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key. 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. | > End | Faulty TV tuner Step 2 |
| 2 | Check coaxial cable. | Check that coaxial cable connection is seated properly at the following positions: PCM TV tuner | Coaxial cable was connected correctly. Go to Step 6 | Coaxial cable was loose. Go to Step 3 |
| 3 | Coaxial cable was loose | Check whether the coaxial connector or socket is damaged. | Socket and connector are OK. Go to Step 4 | Socket and/or connector are damaged. Go to Step 5 |
| 4 | Socket and connector are OK | Re-connect connection. | > End | |
| 5 | Socket and/or connector are damaged | Replace damaged component. | > End | |
| 6 | Check coaxial cable for open circuit | Check resistance of: internal wiring external wiring | OK at < 2 ohms Go to Step 7 | Replace coaxial cable. --> End |
| 7 | Check coaxial cable for short circuit | Check resistance between: internal and external wiring internal wiring and ground external wiring and ground | OK at = > or = 1 Mohms Go to Step 8 | Replace coaxial cable. --> End |
| 8 | Check coaxial cable for short circuit to B+ | Switch on ignition. Check for short circuit to B+ between: internal wiring and battery positive connection external wiring and battery positive connection | OK at 0 V Go to Step 9 | Replace coaxial cable. --> End |
| 9 | Check components | Connect a different TV tuner. Erase 'PCM MMI' fault memory. Switch off ignition. Remove and then re-insert key. Switch on ignition. Read out the 'PCM MMI' fault memory. Was fault '800D' entered again? | The fault was not entered. Replace original TV tuner. --> End | The fault was entered again. Replace PCM. --> End |
DIAGNOSIS/TROUBLESHOOTING PROCEDURE
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