Diagnostic Mode 08 - Request Control Of On-Board System, Test Or Component
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.
Test requirements
- No DTCs stored in the DTC memory.
- Intake Air Temperature (IAT) maximum 60 °C.
- Coolant temperature 80 -110 °C.
- Throttle valve angle 12.0 - 16.0%.
Function test
If the accelerator pedal is depressed during the test, the test will be aborted.
-- 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 OK | |||||
-- Switch the ignition OFF.
If the specified result is obtained:
System OK.
If the specified result is Not obtained:
-- Repeat the tank leak test, switch the ignition off and start the engine again and let run for 15 minutes at idle.
-- Switch the ignition OFF.
If the specified result is again Not obtained:
-- A leak may be present. Refer to EVAP SYSTEM, CHECKING FOR LEAKS .