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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1383 (Engine Control System Diagnosis (DTC P0130 To DTC P0456) -- 1.8L (LNK)) >> Diagnosis >> DTC P0441 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  This step verifies the electrical operation of the EVAP canister purge solenoid.
  2. 5:  This step tests the function of the EVAP canister purge solenoid.
  3. 8:  This step uses the EVAP Purge/Seal function to test for the correct operation of the EVAP canister vent solenoid, the pressure switching solenoid, and the purge solenoid. Using the EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor the FTP sensor.
  4. 9:  This step tests for a blockage or restriction in the EVAP canister vent valve and hoses. If the vacuum does not drop to less than -18.68 mm Hg (-10.0 inches H2O) after 30 seconds, there is a faulty condition in the EVAP vent system. The EVAP vent portion of the EVAP control system is diagnosed in DTC P0446.
  5. 21:  This step uses the EVAP Purge/Seal function to test for the correct operation of the EVAP canister vent solenoid, the pressure switching solenoid, and the purge solenoid. Using the EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor the FTP sensor.
DTC P0441

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics and Evaporative Emissions (EVAP) Hose Routing Diagram
Connector End View Reference:  Powertrain Control Module (PCM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Install a scan tool and check for DTCs.
Is a DTC P0450. P0451, P0452, or P0453 present?		 - Go to Scan Tool Data Definitions Go to Step 3 
3
  1. Review the Freeze Frame/Failure Records
  2. Diagnose the DTC captured in the Freeze Frame/Failure records first
Is DTC P0441 captured in the Freeze Frame/Failure records?		 - Go to Step 4  Go to Diagnostic Trouble Code (DTC) List
4  Command the EVAP purge solenoid ON and OFF with the scan tool. Refer to Scan Tool Output Controls .
Do you hear or feel a click as the EVAP purge solenoid is commanded ON and OFF?		 - Go to Step 5  Go to Step 10 
5 
  1. Remove the purge line from the EVAP purge solenoid.
  2. Connect a vacuum gage to the EVAP purge solenoid purge port.
  3. Start the engine.
Does the vacuum gage indicate a vacuum being applied?		 - Go to Step 18  Go to Step 6 
6 With the engine running command the purge valve ON, OPEN.
Does the vacuum gage indicate a vacuum being applied?		 - Go to Step 7  Go to Step 17 
7
  1. Reinstall the EVAP purge line to the purge solenoid.
  2. Remove the fuel fill cap in order to release any pressure inside the fuel tank.
  3. Re install the fuel fill cap.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the FTP sensor parameter on the scan tool.
Is the FTP sensor within the specified range?		 0.0-0.99 mm Hg (0.0-0.5 in H2O) Go to Step 8  Go to Step 15 
8 
  1. Start the engine.
  2. Select the EVAP Purge/Seal function on the scan tool. Refer to Service Bay Test .
  3. Command the EVAP Purge/Seal function ON.
Does the FTP sensor indicate a reading of at least the first specified value for as long as the second specified value?		 -28.20 mm Hg (-15.10 in H2O)
2 minutes		 Go to Step 9  Go to Step 22 
9 
  1. Repeat the EVAP Purge/Seal test exactly as detailed below.
  2. Command the EVAP Purge /Seal function ON.
  3. Monitor the FTP sensor with the scan tool for at least the first specified value for the start of the test.
  4. Continue to observe the FTP sensor for 30 seconds after the purge/seal test is complete.
Did the FTP sensor indicate that the vacuum dropped to less than the second specified value in the 30 seconds after the test was complete?		 -28.20 mm Hg (-15.10 in H2O)
-18.68 mm Hg (-10.00 in H2O)		 Go to Diagnostic Aids Go to DTC P0446 
10
  1. Disconnect the EVAP purge solenoid.
  2. Turn ON the ignition, with the engine OFF.
  3. Connect a test lamp between the ignition positive voltage circuit of the EVAP purge solenoid and a known good ground. Refer to Troubleshooting with a Test Lamp in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 11  Go to Step 13 
11
  1. Connect a test lamp between the ignition positive voltage circuit of the EVAP purge solenoid and the control circuit of the EVAP purge solenoid. Refer to Circuit Testing in Wiring Systems.
  2. Command the EVAP purge solenoid ON with a scan tool.
Does the test lamp illuminate when the EVAP purge solenoid is commanded ON and turn OFF when the EVAP purge solenoid is commanded OFF?		 - Go to Step 14  Go to Step 12 
12 Test the control circuit of the EVAP purge solenoid for an open, a short to voltage, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 16 
13
  1. Repair the open or short to ground in the ignition positive voltage circuit of the EVAP purge solenoid. Refer to Wiring Repairs in Wiring Systems.
  2. Replace the fuse as necessary.
Did you complete the repair?		 - Go to Step 21  -
14 Test for an intermittent and for a poor connection at the EVAP canister purge solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 18 
15 Test for an intermittent and for a poor connection at the FTP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
16 Test for an intermittent and for a poor connection at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs and in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 20 
17 Inspect the EVAP purge solenoid vacuum supply for a blockage or restriction.
Did you find and correct the problem?		 - Go to Step 21  Go to Step 18 
18 Replace the EVAP purge solenoid. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
Did you complete the replacement?		 - Go to Step 21  -
19 Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Is the action complete?		 - Go to Step 21  -
20 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Is the action complete?		 - Go to Step 21  -
21 
  1. Start the engine.
  2. Select the EVAP Purge/Seal function on the scan tool. Refer to Service Bay Test .
  3. Command the EVAP Purge/Seal function ON.
Does the FTP sensor indicate a reading of at least the first specified value for as long as the second specified value?		 -28.20 mm Hg (-15.10 in H2O)
2 minutes		 Go to Step 23  Go to Step 22 
22 The EVAP System failed the EVAP Purge/Seal test.
Is there an EVAP system DTC that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
23 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 System OK
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