Diagnostic Mode 08 - Request Control of On-Board System, Test or Component

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.
- Pressure of (max. 70 mbar) can be applied to the fuel system via the test connection (in engine compartment, right) and via engine leak detection spray (e.g.: G 001 800 A1) leaks can be detected.

Test Conditions
- There must not be any DTCs stored in DTC memory, Diagnostic Mode 03 - Read DTC Memory Diagnostic mode 3: Check DTC memory.
- Coolant temperature must be at least 80 to 110 degrees C, Diagnostic Mode 01 - Read Current System Data Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.
- Intake air temperature may be 60 degrees C maximum, Diagnostic Mode 01 - Read Current System Data Diagnostic mode 1: Check measured values; PID 15, Intake air temperature.

Function Test
- Connect diagnostic tester. Diagnostic Tester, Connecting
- Start engine and let run at idle for at least 15 minutes.
- Under address word 33, select "Diagnostic mode 8: Tank leak test".
- Select measuring value "Test-ID 01: Tank leak test".
- Check specified value of tank leak test at idle.

Test ID 01: Tank leak test Specification
Test function is being initiated, Test function active
please wait Test function
aborted Test function active
Test function off

NOTE:
- During tank leak test, Engine Control Module (ECM) limits "test function active" to 12 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 at idle for at least 15 minutes.

If the specification is obtained:
- End diagnosis and switch ignition off.

If the specification is not obtained:
- EVAP canister system, checking for leaks. EVAP System, Checking For Proper Seal
- Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-, checking. EVAP Canister Purge Solenoid Valve 1, Checking
- Fuel system Leak Detection Pump (LDP) -V144-, checking. Leak Detection Pump, Checking