I have a 1996 nissan pathfinder and failed smog due to check engine light. code P1401 EGR Temperature sensor, Bought one... don't know if I need to clean the valve and how to get a diagram or some info on what to do...
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1996 Nissan Pathfinder
Question: 1996 nissan P1401 EGR Temperature Sensor
It's the temp sensor in the EGR passage. Need to check it first.
Answer #2patrick mannion from Greg Solow's Engine Room, February 09, 2011, 19:36Master
Test the old sensor see if it has 8 to 10 mega Ohms resistance at 32 degrees, .6 to .7 mega Ohms at about 122 degrees , if it "open/no continuity the sensor is definitely bad. The sensor may be OK just not seeing exhaust flow across it due to a bad EGR valve or vacuum modulator. Alldata has easy to follow tests.
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Replyshannonconnolly, February 10, 2011, 18:43Rookie
Thank you very much! I am on it! and will let you know how it turns out!
Answer #3Visitor, February 09, 2011, 19:44
First test the EGR system for malfunction. At 2500 rpm the valve should open, if not check for vacuum, if you have vacuum and the EGR opens, next check to see if the vehicle will stall when manually lifting the valve. if you stall, the system is good and poceed to testing the sensor. First check for an open circuit, then measure the resistance.