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Engine code P1494 on a 2000 Jeep Cherokee indicates a problem with the evaporative emission control (EVAP) system, specifically related to the leak detection pump (LDP). This code may be triggered by issues such as a malfunctioning LDP, a faulty vacuum line, or a leak in the EVAP system. It can also occur if there's a problem with the electrical connections or wiring associated with the pump. Addressing this code typically involves inspecting the EVAP system for leaks and ensuring all components are functioning correctly.

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