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.
DTC Descriptor
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, P0112, P0113, P0117, P0118, P0122, P0123, P0131, P0132, P0133, P0137, P0138, P0140, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0402, P0404, P0405, P0406, P0452, P0453, P0462, P0463, P0501, and P2422 are not set. |
| • | The ignition 1 voltage is between 11-16 volts. |
| • | The barometric pressure (BARO) is more than 72 kPa. |
| • | The engine coolant temperature (ECT) is more than 70°C (158°F). |
| • | The estimated ambient air temperature is more than 9.75°C (50°C). |
| • | The purge enable time is more than 15 seconds. |
| • | The engine run time is more than 590 seconds. |
| • | The Fuel Tank Pressure is more than -1 Kpa and less than .3 Kpa. |
| • | The fuel level is between 14-87 percent. |
| • | The engine is idling. |
| • | The vehicle speed is less than 2 km/h (1 mph). |
| • | 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. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Evaporative Emissions Hose Routing Diagram | ||||
1 | Did you perform the Diagnostic System Check - Engine Controls? | -- | Go to Step 2 | |
2 |
Important: Additional DTCs will set with the EVAP solenoid disconnected. Is the fuel tank pressure sensor parameter within the specified value? | -1 to +1 H2O | Go to Diagnostic Aids | Go to Step 3 |
3 |
Is the fuel tank pressure sensor parameter within the specified range? | -1 to +1 H2O | Go to Step 4 | Go to Step 5 |
4 | Replace the EVAP purge solenoid. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
5 | Replace the fuel tank pressure (FTP) sensor. Did you complete the replacement? | -- | Go to Step 6 | -- |
6 |
Is the fuel tank pressure sensor parameter within the specified range? | -1 to +1 H2O | Go to Step 7 | Go to Step 2 |
7 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |
