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codes - 5/7/2008 12:14:44 PM    Timcon   Posts: 1 Joined: 5/6/2008 Status: offline does any one know about code p1494 on a 1999. What is it and where is it? Is this adealer fix or can I do it. Thanks Tim Post #: 1

RE: codes - 5/7/2008 2:08:07 PM    kurts2   Posts: 591 Joined: 10/27/2006 Status: offline P1494  Leak Detection Pump Sw or Mechanical Fault an Incorrect input state detected for the Leak Detection Pump (LDP) pressure switch. Sounds like a bad switch.  It should be fairly easy to change, however I have never done one. As for the location, it must be near the evap canister, just look for a solinoid and/or somthing with an electric connector (as most evap systems do not have ele wires at all, this is a add on system...prob CA emmisions)  Here is some info on the system.  LEAK DETECTION PUMP MONITOR The leak detection assembly incorporates two primary functions: it must detect a leak in the evaporative system and seal the evaporative system so the leak detection test can be run. The primary components within the assembly are: A three port solenoid that activates both of the functions listed above; a pump which contains a switch, two check valves, a spring/diaphragm, and a canister vent valve (CVV) seal which contains a spring loaded vent seal valve. Good luck, Kurt (in reply to Timcon) Post #: 2

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