check engine light came on OBD2 codes are P0452 and P0449
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Answer #1PARTS GUY December 27, 2011, 21:19Master
P0452 EVAP Pressure Sensor Circuit Low InputPossible Causes Setting Conditions
•Tank pressure sensor connector is damaged (check pins for damage)
•Tank pressure sensor signal circuit is shorted to ground
•Tank pressure sensor reference (5v) circuit is open or shorted to ground
•Tank pressure sensor has failed
•PCM has failed
Engine runtime over 5 seconds; system voltage from 10-16v, and the PCM detected the EVAP Tank Pressure sensor signal was less than 0.10v (less than - 39.06 hPa). The PCM supplies a 5-volt reference and a ground to the sensor, which allows the sensor’s output voltage to range from 0.10v to 4.90v.
This code sets in 2 Trip(s).
This code will turn on the MIL (Malfunction Indicator Lamp)
Customer Concern: The check engine light is on with a code P0449.
Tests/Procedures: 1. Test the resistance of the Canister Closed Valve (CCV). The specification is 23-26 ohms. If the solenoid tests normal, then test the entire circuit from the fuse to the pin 79 at the Powertrain Control Module (PCM). Replace the CCV or repair wiring as needed.
2. There is a second meaning of this fault code and it could mean that the valve is closed all the time. Be sure to test it using two jumper wires, applying power and ground to it and trying to blow through the hose and into the canister. If the valve is de-energized air should go into the canister freely. If not, replace the valve.
3. Check for a restriction in the secondary canister or the filter assembly in the wheel well on the fuel filler neck. If is common for dirt and debris from the rear tire to plug up the filter or the water drain on the filter and cause the system to be restricted or possibly full of water if the vehicle was driven in the rain.