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For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Bonneville 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge
Table 1: DTC P1441

Refer to

EVAP Control System Overview


Object Number: 200517 Size: LF
(1)EVAP Vent Valve/Solenoid
(2)EVAP Vent Valve/Solenoid Ignition Feed Circuit Terminal
(3)EVAP Vent Valve/Solenoid Control Circuit Terminal
(4)EVAP Vent Valve/Solenoid Filter
(5)EVAP Vapor Lines
(6)Fuel Tank Pressure Sensor
(7)Fuel Tank Pressure Sensor Ground Circuit Terminal
(8)Fuel Tank Pressure Sensor Signal Circuit Terminal
(9)Fuel Tank Pressure Sensor Circuit 5 Volt Reference Circuit Terminal
(10)Fuel Filler Pipe
(11)Check Valve (Spitback)
(12)Modular Fuel Sender Assembly
(13)Fuel Limiter Vent Valve (FLVV)
(14)Pressure/Vacuum Relief Valve (Optional)
(15)EVAP Canister
(16)EVAP Canister Purge Valve/Solenoid Ignition Feed Circuit Terminal
(17)EVAP Canister Purge Valve/Solenoid Control Circuit Terminal
(18)Intake Manifold Vacuum Source
(19)EVAP Canister Purge Valve/Solenoid
(20)EVAP Service Port
.

System Description

This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The control module seals the EVAP system by commanding the EVAP canister purge valve Closed and the EVAP canister vent 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 following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent valves.

Control Module Command

EVAP Canister Purge Valve

EVAP Canister Vent Valve

ON

Open

Closed

OFF

Closed

Open

Conditions for Running the DTC
    â€¢ DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0442, P0443, P0446, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1115, P1121, or P1122 are not set.
    â€¢ The ignition voltage is between 10-18 volts.
    â€¢ The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).
    â€¢ The start-up idle air temperature (IAT) is between 4-30°C (39-86°F).
    â€¢ The start up ECT and IAT are within 9°C (16°F).
    â€¢ The fuel tank level is between 15-85 percent.
    â€¢ The barometric pressure (BARO) is more than 75 kPa (10.8 psi).
    â€¢ The vehicle speed sensor (VSS) is less than 120 km/h (75 mph).

Conditions for Setting the DTC

The PCM detects vacuum during a non-purge condition.

Action Taken When the DTC Sets
    â€¢ The control module will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test ran and failed.
    â€¢ The control module will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.

Conditions for Clearing the MIL/DTC
    â€¢ The control module will turn OFF the MIL during the third consecutive trip in which the diagnostic ran and passed.
    â€¢ A history DTC clears after 40 consecutive warm-up cycles without a malfunction.
    â€¢ Use the scan tool in order to clear the DTC.

Diagnostic Aids

An intermittent condition could be caused by an improperly installed or damaged EVAP canister purge valve or a temporary blockage in the EVAP canister purge valve. To repair a blockage in the EVAP system, refer to Evaporative Emission System Cleaning .

Test Description

The number below refers to the step number on the diagnostic table.

  1. Because of temperature restrictions, use the Service Bay Test in order to complete the test procedure.

DTC P1441

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check-Engine Controls?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Are DTCs P0443, P0449, P0452, or P0453 also set?

--

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 3

3
  1. Remove the fuel fill cap.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, monitor the FTP.

Does the scan tool indicate FTP within the specified range?

-0.5 to +0.5 in H2O

Go to Step 4

Go to DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage

4
  1. Disconnect the EVAP purge pipe from the EVAP canister purge valve.
  2. Install a hand held vacuum gage to the EVAP purge port.
  3. Disconnect the EVAP canister purge valve harness connector.
  4. Monitor vacuum on the vacuum gage.
  5. Start the engine and allow the engine to idle.
  6. Increase the idle to 1,200-1,500 RPM.

Does the gage indicate an increase in vacuum?

--

Go to Step 5

Go to Diagnostic Aids

5

Replace the EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .

Did you complete the replacement?

--

Go to Step 6

--

6

  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?

--

Go to Step 7

Go to Step 3

7

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

Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List/Type

System OK