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Home >> Pontiac >> 2007 >> Vibe Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P0134 To DTC P0451 >> DTC P0441 >> Test Description

Test Description

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

  1. 2:  This step verifies that the DTC P0441 is captured in the Freeze Frame/Failure Record list. When multiple EVAP system DTCs are set, the DTC stored in the Freeze Frame/Failure Record is the best diagnostic starting point.
  2. 3:  This step verifies the electrical operation of the EVAP canister purge solenoid.
  3. 4:  This step tests the function of the EVAP canister purge solenoid.
  4. 7:  This step uses the EVAP Service Bay test in order to verify the correct operation of the EVAP canister purge solenoid and the other EVAP system components. Performing the EVAP Service Bay test also tests for EVAP system leaks.
  5. 18:  This step tests for a blockage or a restriction in the purge port and purge passages located in the EVAP canister assembly. If the purge passage is blocked or restricted, the EVAP system diagnostic can fail and set this DTC.
  6. 19:  This step uses the EVAP Service Bay test in order to verify the correct operation of the EVAP canister purge solenoid and the EVAP vacuum leak pump assembly. Performing the EVAP Service Bay test also tests for EVAP system leaks.
DTC P0441

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Was DTC P2420 also set? - Go to DTC P2420 Go to Step 3 
3  Command the evaporative emission (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 4  Go to Step 8 
4 
  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 15  Go to Step 5 
5 With the engine running command the purge valve ON, OPEN.
Does the vacuum gage indicate a vacuum being applied?		 - Go to Step 6  Go to Step 14 
6
  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 fuel tank pressure (FTP) sensor parameter on the scan tool.
Is the FTP sensor within the specified range?		 3.5-3.8 V Go to Step 7  Go to DTC P0451 
7  Was DTC P0455 also set? - Go to DTC P0455 Go to Step 17 
8
  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 .

Does the test lamp illuminate?		 - Go to Step 9  Go to Step 11 
9
  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 Troubleshooting with a Test Lamp .
  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 12  Go to Step 10 
10 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 .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 13 
11
  1. Repair the open or short to ground in the ignition positive voltage circuit of the EVAP purge solenoid. Refer to Circuit Testing and Wiring Repairs .
  2. Replace the fuse as necessary.
Did you complete the repair?		 - Go to Step 19  -
12 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 .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 15 
13 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 .
Did you find and correct the condition?		 - Go to Step 19  Go to Step 16 
14 Inspect the EVAP purge solenoid vacuum supply for a blockage or restriction.
Did you find and correct the problem?		 - Go to Step 19  Go to Step 15 
15 Replace the EVAP purge solenoid. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
Did you complete the replacement?		 - Go to Step 19  -
16 Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 19  -
17 Inspect for a blockage or a restriction in the EVAP purge line between the purge solenoid and the EVAP canister.
Did you find and correct the condition?		 - Go to Step 19  Go to Step 18 
18 
  1. Remove the EVAP canister from the vehicle. Refer to Evaporative Emission Canister Replacement .
  2. Test the operation EVAP canister and EVAP vacuum leak pump assembly. Refer to Evaporative Emission Control System Diagnosis .
  3. Replace the EVAP canister as necessary.
Did you find and correct a condition?		 - Go to Step 19  Go to Diagnostic Aids
19 
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Perform the EVAP service bay test with the scan tool. Refer to EVAP Service Bay Test in Service Bay Test .
Are there any EVAP DTCs set in Last Test Failed?		 - Go to Step 20  Go to Step 21 
20 The EVAP System failed the Service Bay Test.
Is there an EVAP system DTC other than DTC P0441 that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
21 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 - Vehicle System OK
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