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.

Diagnostic Mode 08, TID $01

Diagnostic Mode 08, TID $01 is used to determine if the evaporative system may be leaking.

NOTE:

The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 - and Leak detection pump (LDP) V144 seal the tank system.

Test Prerequisites

Coolant temperature must be 80 to 110 C → Diagnostic Mode 01 - Read Current System Data ; PID 5, Coolant temperature.
Intake air temperature must not be above the maximum of 60 C → Diagnostic Mode 01 - Read Current System Data ; PID 15, Intake air temperature.
Throttle valve angle 12.0 to 16.0% → Diagnostic Mode 01 - Read Current System Data ; PID 17: Throttle valve position (absolute)

Function Test

Connect diagnostic tester → Diagnostic Tester, Connecting .
Start engine and let run at least 15 minutes at idle.
Under address word 33, select "Diagnostic mode 8: Tank leak test".
Measuring value "Test-ID 01: select Tank leak test".

Check specified value of tank leak test at idle.

Test-ID 01:		Tank leak test		Specified value:
		Test function will be initiated Test function active Test off Test aborted No results		Test OK

NOTE:

The function test can take a few minutes.
If the accelerator pedal is depressed during the test, the test will be aborted.
To repeat the tank leak test, switch ignition off and start engine again and let run 15 minutes at idle.

If specified value is obtained:

End diagnosis and switch ignition off.

If specified value is not obtained:

EVAP canister system, checking for proper seal → EVAP System Diagnostic Leak Test, Performing .
Leak detection pump (LDP) V144 , checking → Leak Detection Pump, Checking .