Function test

• Connect Fault Read Out Device V.A.G 1551 and select engine electronics control module with "Address word 01". Engine must run at idle for this. Connect fault read out device and select engine control module.

Scan tool display:

Quick data transfer HELP Select function XX

• Press buttons 0 and 8 for function "Reading measuring value blocks" and press Q button to confirm input.

Scan tool display:

Read measuring value block Enter display group number XXX

• Press buttons 0 7 and 1 for "Display group number 71" and press Q button to confirm input.

Scan tool display

Read measured value block 71 -> Reed open Test OFF

• Press button 4 for "Initiate basic setting" function

Scan tool display

System in basic setting 71 -> Reed open Test ON

Scan tool display

System in basic setting 71 -> Reed closed Test ON

EVAP canister system test is initiated. First, function of reed contact (in Leak Detection Pump (LDP) V144 ) is checked by control module.

Scan tool display

System in basic setting 71 -> Reed closed Syst. Test Test ON

After approx. 10 seconds, Leak Detection Pump (LDP) V144 is activated and generates pressure in fuel system.

Scan tool display

System in basic setting 71 -> Reed open Syst. Test Test ON

After approx. 50 seconds, the test is initiated (this can take up to 120 seconds if there is insufficient pressure in the fuel system).

Scan tool display

System in basic setting 71 -> Reed open Measurement Test ON

The Leak Detection Pump (LDP) V144 switches off and the time until the reed contact closes is measured by the control module.

Scan tool display

System in basic setting 71 -> Reed closed END of measurement Syst. OK

• Check display in display fields 3 and 4:

Display field 3 specified value: END of measurement

Display field 4 specified value: Syst. OK

If the specifications are not obtained:

• Checking for leaks.

If specified values are achieved:

• Press → key.
• Press buttons 0 and 6 for function "End output" and press Q button to confirm input.
• Switch off ignition.