P0441

DTC P0441

SYSTEM DESCRIPTION
This DTC tests for continuous intake manifold vacuum flow to the Evaporative Emission (EVAP) System. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Closed. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets.




The table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent solenoid valves.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTC:
DTC P0441 Evaporative Emissions (EVAP) System Continuous Purge Flow

CONDITIONS FOR RUNNING THE DTC
- DTCs P0106, P0107, P0108, P112, P0113, P0117, P0118, P0122, P0123, P0131, P0132, P0133, P0134, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204 P0402, P0404, P0405, P0406, P0443, P0452, P0453, P0462, P0463, P0488, P0502, P2195, and P2196 are not set.
- The barometric pressure (BARO) is more than 72 kPa.
- The engine coolant temperature (ECT) at start-up is more than - 5°C (23°F).
- The intake air temperature (IAT) at start-up is less than 40°C (104°F).
- The start-up IAT minus the startup ECT is within 12°C (22°F).
- The start-up ECT minus startup IAT is within 50°C (90°F).
- The start-up IAT minus IAT are within 3°C (5°F).
- The ignition 1 voltage is between 11-16 volts.
- Purge start time is less than 360 seconds.
- Engine Run Time is more than 1 second and less than 120 seconds.
- DTC P0441 runs once an ignition cycle when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The FTP sensor indicates vacuum during a non-purge condition.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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.

TEST

Step 1:

Steps 2-5:

Steps 6-7: