DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge. Oldsmobile Intrigue 1999

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 Engine 🢒 Engine Controls - 3.5L 🢒 DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge

Fuel Tank, FTP Sensor, Fuel Pump
Engine Controls Components
OBD II Symbol Description Notice
ESD Notice

Circuit Description

The PCM tests the EVAP system for the following conditions:

•	Large and small leaks (P0440 and P0442)

•	Excess vacuum (P0446)

•	Purge flow during non-commanded conditions (P1441)

•	Fuel Tank Pressure sensor and Fuel Level sensor faults (P0452, P0453, P0462 and P0463)

•	EVAP Purge and Vent Valve faults (P0443 and P0449)

The PCM monitors the amount of vacuum in the EVAP system by monitoring the Fuel Tank Pressure sensor. For this DTC the PCM turns OFF the EVAP Purge Valve and turns ON the EVAP Vent Valve when the Conditions for Running the DTC have been met. This test indicates a leaking EVAP Purge Valve or Flow During Non-Purge if the Fuel Tank Pressure sensor indicates increasing fuel tank vacuum. This DTC will set after two consecutive failures of the above test.

Conditions for Running the DTC

•	No misfire, fuel trim, injector control circuit, AIR, EGR, VSS, HO2S, TP, MAP, MAF, ECT or IAT DTCs set.

•	Battery voltage is between 5 and 18 volts.

•	Barometric pressure is more than 75 kPa.

•	Fuel level is between 15% and 85% of full capacity for at least 10 seconds continuously. The time limit is required because fuel sloshing within the tank may cause the fuel level indication to vary outside the fuel level limits.

•	ECT at start up was between 4°C and 30°C (40°F and 86°F).

•	IAT at start up was between 4°C and 30°C (40°F and 86°F).

•	ECT not more than 8°C above or 2°C below IAT at start up.

Conditions for Setting the DTC

An increasing vacuum in the EVAP system is monitored.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

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The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

•	The PCM turns the MIL Off after three consecutive drive trips that the diagnostic runs and does not fail.

•	A last test failed (current DTC) clears when the diagnostic runs and does not fail.

•	A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.

•	Use a scan tool in order to clear the MIL/DTC.

•	Interrupting the PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Powertrain Control Module (PCM) Description , Clearing Diagnostic Trouble Codes.

Diagnostic Aids

Notice: Use the connector test adapter kit J 35616-A for any test that requires probing the following items:

•	The PCM harness connectors

•	The electrical center fuse/relay cavities

•	The component terminals

•	The component harness connector

Using this kit will prevent damage caused by the improper probing of connector terminals.

Important: An accurate indication of fuel level is required for the PCM to properly Pass or Fail this DTC. Always diagnose fuel level sensor DTCs before performing this DTCs diagnostic table. Always check for fuel level sensor DTCs stored as History.

Perform a physical inspection of the EVAP system. Check for the following conditions:

•	Incorrectly routed or defective EVAP system vacuum and vapor lines.

•	A stuck open EVAP Purge Valve.

•	A malfunctioning or damaged vapor canister

Check for charcoal release from the vapor canister. Refer to the Evaporative Emission System Cleaning procedure.

If the problem is intermittent, refer to Intermittent Conditions .

The vacuum and pressure in the EVAP system is measured in inches of water (H2O). Most gauges measure vacuum in inches of mercury (Hg) and pressure in pounds per square inch (psi). The following shows how the values compare:

in H2O	in Hg	psi
1in H2O	0.07 in Hg	0.0361 psi
5 in H2O	0.36 in Hg	0.180 psi
10 in H2O	0.73 in Hg	0.361 psi
15 in H2O	1.10 in Hg	0.541 psi

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

This DTC should only set if an increasing vacuum was monitored by the PCM while the EVAP Vent and Purge Valves were both sealed.

Check for possible carbon contamination of the EVAP Purge Solenoid Valve and the purge line.

Step	Action	Value(s)	Yes	No
1	Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to the Powertrain On Board Diagnostic (OBD) System Check
2	Is DTC P0443 stored as History?	--	Go to DTC P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit .	Go to Step 3
3	Disconnect the EVAP Purge line from the EVAP Purge Solenoid Valve. Connect a vacuum gauge (in. Hg.) to the solenoid purge port. Start and idle the engine. Within 30 seconds of starting the engine command the EVAP Purge Solenoid Valve OFF with a scan tool. Does the vacuum gauge ever indicate vacuum?	--	Go to Step 4	Refer to Diagnostic Aids.
4	Important: Check for carbon contamination. Refer to Diagnostic Aids. Replace the EVAP Purge Solenoid Valve. Is the action complete?	--	Go to Step 5	--
5	Clear DTCs with the scan tool. Turn the key to Off and wait 15 seconds Operate vehicle within the conditions that are required for this diagnostic to run. Refer to Conditions for Running the DTC. Does the scan tool indicate that this test ran and passed?	--	Go to Step 6	Go to Step 2
6	Review Captured Info using the scan tool. Are there any DTCs that have not been diagnosed?	--	Go to the applicable DTC table	System OK