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Home >> Audi >> 2001 >> S8 >> Repair and Diagnosis >> External Pages >> Different car >> Section 136 (On Board Diagnostic (OBD) - 4.2L V8 (AKB, Aux, AYS)) >> On Board Diagnostics (OBD) >> Motronic system, On Board Diagnostic (OBD) >> Output Diagnostic Test Mode (DTM) (function 03) (engine codes AUX, AKB) >> Test requirements >> Actuating Leak Detection Pump (LDP) -V144-

Actuating Leak Detection Pump (LDP) -V144-

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Indicated on display

Fig 1: VAG1551 Scan Tool Display - Output Diagnostic Test Mode: Engine Codes AUX, AKB (Leak Detection Pump -V144-)
G03621218Courtesy of AUDI OF AMERICA, INC.

The change over valve in the LDP is activated for approximately 1 minute (clicks), unless the button pressed to switch to the next actuator.

NOTE: The clicking can be heard by listening in the area of the left rear wheel housing.

If valve is not actuated (does not click), see EVAPORATIVE EMISSIONS (EVAP) SYSTEM, SERVICING .

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