EVAP error P0449 and P0452
2440 Views 4 Replies Latest reply: 2017-07-21 22:56:35
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Level 2
(21) points
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Level 7
(1473) points
You have a broken wire somewhere. What is your FTP sensor reading KOEO? Command the vent solenoid on and off with your scan tool and listen, you should hear a faint clicking sound as it opens and closes. There are parameters for the vent solenoid that tells you if you have a short or an open circuit for the vent solenoid. The parameters should be "EVAP vent solenoid circuit".Make sure the PCM/BATT fuse #14 is good in the under hood fuse panel. When you turn the key on you should have 12 volts on the red wire with the white tracer the plugs in to the vent solenoid.Post your FTP sensor voltage and I'll see what I can figure out.Kevin -
Level 2
(21) points
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Level 7
(1473) points
Try running the purge/seal test of the EVAP system (if your tool has it). While running the test, monitor your FTP sensor. If it stays at 0, that is your problem. If your FTP voltage reading is below 0.15V's for 10 seconds with the key on, you will get code P0452.The 3 pin connector on the FTP sensor, pin #3 (grey wire)should have 5 volts KOEO, pin #2 (tan with black tracer) should be ground and pin 1 is the signal wire. Pin 1's voltage will change as the pressure in the tank changes.FTP signal voltage should be 1.3V-1.7V KOEO. Since you changed the FTP sensor, the problem must be a broken wire. There is a TSB about a wiring harness rubbing on the front driveshaft causing P0452 and other codes.You could back probe the FTP sensor connector pin 3 (grey wire) with KOEO you should have 5 volts. Pin 1 (dark green wire) should be between 1.3V and 1.7V KOEO. If you have voltage on your dark green wire at the connector, it must be broken before it gets to the PCM.Kevin -
Level 7
(1473) points
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