Rick's Free Auto Repair Advice

P1494 EVAP Leak Detection Pump Switch or Mechanical Fault

Fix code P1494 EVAP Leak Detection Pump Switch or Mechanical Fault

If you have a P1494 EVAP Leak Detection Pump Switch or Mechanical Fault trouble code, this post will help you understand what it is and how to fix it.

The leak detection pump is part of the evaporative emissions system. This system tests the fuel system to make sure it is not leaking fuel vapors into the air. The system pulls a vacuum on the fuel system and holds it for a period of time. If the vacuum does not hold, it sets a code. In this code, the PCM has detected a fault with with either the leak detection pump switch or a mechanical fault with a vacuum line

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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