Diagnostic Mode 08 - Request Control of On-Board System, Test or Component
WARNING: This page is about a different car, the 2009 Audi S8, 2008 Audi S8, and 2007 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Mode 08 is used to control the operation of an on-board system, test or component. A Mode 8 service can be used to turn on-board system ON or OFF, or to cycle an on-board system, test or component ON or OFF for a specific period of time. The service can also be used to request system status or to report test results.
Diagnostic Mode 08, TID $01
Diagnostic Mode 08, TID $01 is used to determine if the evaporative system may be leaking.
NOTE:
- Depending on scan tool and protocol used, diagnostic mode 08 and the information provided may be referred to by a different name.
NOTE:
- If the accelerator pedal is depressed during the test, the test will be aborted.
Test requirements
- No DTCs stored in the DTC memory.
- Intake Air Temperature (IAT) maximum 60 C.
- Coolant temperature 80 to 110 C.
- Throttle valve angle 12.0 to 16.0%.
Procedure
- Connect the scan tool.
- Start the engine and run at idle for at least 15 minutes.
- Select "Mode 8: Tank Leak Test".
- Select "Test-ID 01: Tank Leak Test".
- Check the specified value of the tank leak test at idle.
- The following will be displayed on the scan tool screen:
| Tank leak test | Specified value | |||||
|---|---|---|---|---|---|---|
| Test function active Test function is being initiated, please wait Test off Test aborted | Test OK | |||||
- Switch the ignition off.
If the specified value is obtained:
- Refer to "Diagnostic mode 03: Interrogating fault memory " to check for any DTCs that may be stored.
- To repeat the tank test, switch the ignition off and start the engine again and let run for 15 minutes at idle.
- Switch the ignition off.
- End of diagnosis.