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P1494 Diagnostic Trouble Code Discussion for December 2010

EVAP Leak Detection Pump Switch Or Mechanical Fault

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Trouble Ticket Help Requests for DTC P1494
Help Request Posted
2000 Jeep Cherokee Sport 4.0L MIL Lamp on VIN: 1J4FF48S6Y
P1494: EVAP Leak Detection Pump Switch Or Mechanical Fault. All my tests are passing even put the gas cap on the smog machine and tested cap PASSED. I even found a vacuum canister that would have been very hard to find (behind headlamp) it passes a vacuum decay test . I removed parts of sys one by one and leak tested ,...
December 10, 2010