Diagnostic mode 8: Tank leak test

NOTE: This diagnostic mode can only be selected with Module number 10 - Engine Electronics.

Function

This diagnostic mode checks the fuel system for leaks.

NOTE:

The Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- and Leak detection pump (LDP) -V144- seal the tank system.
Using engine leak detection spray (e.g.: G 001 800 A1) leaks can be detected.

Requirements

There must not be any DTCs stored in DTC memory. Refer to Diagnostic mode 3: Check DTC Memory , Diagnostic mode 3: Check DTC memory.
Coolant temperature must be 80 to 110 ° C. Refer to Diagnostic mode 1: Check measured values , Diagnostic mode 1: Check measured values; PID 05, Coolant temperature.
Intake air temperature must not be above the maximum of 60 ° C. Refer to Diagnostic mode 1: Check measured values , Diagnostic mode 1: Check measured values; PID 15, Intake air temperature.

Function test

Evaluation test-ID 01: Tank leak test

Test function:

Specified value:

Test function active

NOTE:

During tank leak test, Engine Control Module (ECM) limits "test function active" to approx. 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 15 minutes at idle.

If a leak is detected:

EVAP canister system, checking for proper seal. Refer to Evaporative Emission (EVAP) canister system, checking for proper seal .
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Refer to Evaporative Emission (EVAP) canister purge regulator valve 1, checking .
Leak detection pump (LDP) -V144-, checking. Refer to Leak Detection Pump (LDP), checking .
Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data , Diagnostic mode 4: Reset/erase diagnostic data.