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Thread: P0440 ses light fix...

  1. #1
    ? ? ? ? ? ? ? ? ? ? 35thpewterz's Avatar

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    Exclamation ses light came on...

    i pulled the code P0440 off our code reader at work and it says EVAP Emission Control System Malfunction. what could this be? i heard something about the gas cap, so im going to check it and erase the code and see if it comes back on.

    any suggestions?


  2. #2
    Registered Member ELS1's Avatar

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    You get that code whenever the pressure is not held by the gas-cap...inspect the gas cap and make sure that the o-ring isnt worn/torn, because that can cause the problem.

    other than that, can be the evap. valve..or a leak somewhere. I found this for you...good luck!



    DTC P0440
    Circuit Description
    The evaporative emission (EVAP) system large leak test applies vacuum to the EVAP system and monitors the rate of vacuum decay. The control module monitors the fuel tank pressure (FTP) sensor in order to determine the rate of vacuum decay. At an appropriate time, the control module turns the EVAP canister purge valve ON (open) and the EVAP canister vent valve ON (closed). This allows the engine to draw a vacuum on the system. At a calibrated time or vacuum level, the control module turns the purge valve OFF (closed), and tests the system vacuum. If the system is unable to achieve the calibrated vacuum level, the PCM will set DTC P0440.

    Conditions for Running the DTC
    DTC P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1111, P1112, P1114, P1115, P1121, and P1122 are not active.
    The system voltage is between 10-18 volts.
    The startup engine coolant temperature (ECT) is between than 4-30C (39-86F).
    The startup intake air temperature (IAT) is between and 4-30C (39-86F).
    The ECT and IAT are within 9C (16F) of each other.
    The fuel tank level is between 15-85 percent.
    The barometric pressure (BARO) is more than 75 kPa.
    The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
    Conditions For Setting the DTC
    The EVAP system is not able to achieve or maintain vacuum during the diagnostic test.

    Action Taken When the DTC Sets
    The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
    Conditions for Clearing the MIL/DTC
    The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    Clear the MIL and the DTC with a scan tool.
    Diagnostic Aids
    Use the EVAP pressure/purge diagnostic station in order to pressurize the EVAP system to aid in locating intermittent leaks.
    A temporary blockage in the EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. To repair a blockage in the EVAP system, refer to Evaporative Emission (EVAP) System Cleaning .
    Test Description
    The numbers below refer to the step numbers on the diagnostic table.

    4) This step verifies that a failure condition is active.

    5) This step verifies if a leak is present.

    6)This step verifies proper operation of the fuel tank pressure (FTP) sensor.

    10) This step tests the EVAP canister purge valve for a restriction or blockage.

    19) This step verifies that repairs are complete and that no other condition is present.

    Step 1
    Did you perform the Diagnostic System Check-Engine Controls?
    --
    Yes: Go to Step 2
    No: Go to Diagnostic System Check - Engine Controls

    Step 2
    Does the scan tool indicate DTC P0443 or DTC P0449 are also set?
    --
    Yes: Go to Diagnostic Trouble Code (DTC) List
    No: Go to Step 3

    Step 3
    1) Inspect the EVAP system for the following conditions:
    -Loose, missing, or damaged service port Schrader valve
    -Loose, incorrect, missing or damaged fuel fill cap
    -A damaged EVAP canister purge valve
    2) Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
    3) Inspect the EVAP system for the following conditions:
    -Disconnected, improperly routed, kinked or damaged EVAP pipes and hoses.
    -A damaged EVAP canister vent valve or EVAP canister

    Did you find and correct the condition?
    --
    Yes: Go to Step 19
    No: Go to Step 4

    Step 4
    1) With a scan tool, capture and record the fail record data and clear the DTCs.
    2) Perform the Service Bay Test. Refer to Service Bay Test .

    Does the scan tool indicate that the service bay test passed?
    --
    Yes: Go to Diagnostic Aids
    No: Go to Step 5

    Step 5

    Important
    Always zero the EVAP Pressure and vacuum (in. H2O) gauges on the J 41413 EVAP Pressure Diagnostic Station before proceeding with diagnosis.

    1) Install the J 41415-40 fuel fill cap adapter.
    2) Connect the J 41413 pressure/purge diagnostic station to the fuel fill cap adapter.
    3) Turn ON the ignition, with the engine OFF.
    4) With the scan tool, seal the EVAP system.
    5) With the J 41413 , pressurize the system to the specified value.
    6) Rotate the J 41413 rotary switch to the OFF/HOLD position.

    Did you obtain the specified value?

    Specified Value = 5 in H2O
    --
    Yes: Go to Step 6
    No: Go to Step 9

    Step 6
    Compare the J 41413 value to the scan tool fuel tank pressure (FTP) sensor value.

    Does J 41413 value measure near the scan tool value?
    --
    Yes: Go to Step 7
    No: Go to Step 13

    Step 7
    1) With the J 41413 , pressurize the EVAP system to the specified value.
    2) Monitor the pressure gauge on J 41413 .
    3) With a scan tool, command the EVAP canister purge valve to 50 percent.

    Does the EVAP system pressure decrease?

    Specified Value = 5 in H2O
    --
    Yes: Go to Step 8
    No: Go to Step 10

    Step 8
    Inspect the vacuum source to the EVAP purge valve for blockage, cuts, or disconnects. Repair as necessary.

    Did you find and correct the condition?
    --
    Yes: Go to Step 8
    No: Go to Diagnostic aids

    Step 9
    1) With the J 41413 , continuously pressurize the EVAP system.

    Important
    The fuel tank may need to be partially lowered in order to inspect components located in the upper portion of the tank.


    2) With the J 41416 ultrasonic leak detector inspect for leaks in the following locations:
    - The EVAP system purge pipe. Refer to Evaporative Emission (EVAP) System Hoses/Pipes Replacement .
    - The EVAP vapor pipe. Refer to Evaporative Emission (EVAP) System Hoses/Pipes Replacement .
    - The EVAP vent hose/pipe.
    - The fuel fill pipe/hose and fuel fill cap.
    - The EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
    - The EVAP canister vent valve. Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement .
    - The EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .
    - The fuel sender assembly and/or seal. Refer to Fuel Sender Assembly Replacement .
    - The fuel tank pressure (FTP) sensor seal. Refer to Fuel Tank Pressure Sensor Replacement .
    - The fill limiter vent valve, pressure relief valve, rollover valves, permanent EVAP pipes and/or fuel tank. Refer to Fuel Tank Replacement .

    Did you find and repair a leak?
    --
    Yes: Go to Step 9
    No: Go to Diagnostic Aids

    Step 10
    1) Monitor the pressure gauge on EVAP pressure/purge diagnostic station.
    2) Disconnect the EVAP purge pipe from the EVAP canister purge valve.

    Does the EVAP system pressure decrease?
    --
    Yes: Go to Step 16
    No: Go to Step 11

    Step 11
    1) Monitor the pressure gauge on the J 41413 .
    2) Disconnect the purge pipe at the EVAP canister.

    Does the EVAP system pressure decrease?
    --
    Yes: Go to Step 17
    No: Go to Step 12

    Step 12
    1) Monitor the pressure gauge on the J 41413 .
    2) Disconnect the EVAP vapor line from the EVAP canister.

    Does the EVAP system pressure decrease?
    --
    Yes: Go to Step 18
    No: Go to Step 15

    Step 13
    Monitor the FTP sensor voltage with a scan tool.

    Is the FTP sensor voltage more than the specified value?

    Specified Value = 4.3 V
    --
    Yes: Go to DTC P0453
    No: Go to Step 14

    Step 14
    Replace the fuel tank pressure (FTP) sensor. Refer to Fuel Tank Pressure Sensor Replacement .

    Did you complete the replacement?
    --
    Yes: Go to Step 19

    Step 15
    Repair for a pinched or obstructed EVAP vapor pipe.

    Did you complete the repair?
    --
    Yes: Go to Step 19


    Step 16
    Replace the EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .

    Did you complete the replacement?
    --
    Yes: Go to Step 19


    Step 17
    Repair the restriction in the EVAP purge pipe. Refer to Evaporative Emission (EVAP) System Cleaning

    Did you complete the repair?
    --
    Yes: Go to Step 19


    Step 18
    Replace the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .

    Did you complete the replacement?
    --
    Yes: Go to Step 19


    Step 19
    Perform the Service Bay Test. Refer to Service Bay Test .

    Does the scan tool indicate that the service bay test passed?
    --
    Yes: Go to Step 20
    No: Go to Step 2

    Step 20
    With a scan tool, observe the stored information, Capture Info.

    Does the scan tool display any DTCs that you have not diagnosed?
    --
    Yes: Go to Diagnostic Trouble Code (DTC) List
    No: System OK

  3. #3
    ? ? ? ? ? ? ? ? ? ? 35thpewterz's Avatar

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    i guess i should check things before i post up from now on...i checked the cap and it was on there crooked somehow. light went off before i could even get to work.

    thanks for the help though
    mason

  4. #4
    Registered Member ELS1's Avatar

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    Cool that you got it fixed. This thread should be found usefull for people who have this problem and do a search

    should be moved to the Methods & Procedures section

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