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DM-TL (DIAGNOSIS MODULE - TANK LEAKAGE)FUNCTIONThe DC Motor LDP ensures accurate fuel system leak detection for leaks as small as0.5mm (.020”). The pump contains an integral DC motor which is activated directly by the<strong>engine</strong> control module. The ECM monitors the pump motor operating current as the measurementfor detecting leaks.The pump also contains an ECM controlled change over va<strong>lv</strong>e that is energized closed duringa Leak Diagnosis test. The change over va<strong>lv</strong>e is open during all other periods of operationallowing the fuel system to “breath” through the inlet filter (similar to the full downstroke of the current vacuum operated LDP).20M54engMS43/ST039/3/17/00
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