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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0446 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
WARNING:

Refer to Fuel and Evaporative Emission Pipe Warning

CAUTION:

Refer to Clean, Dry, Low Pressure Gas Source Caution

  1. Verify the following conditions do not exist:
    • Q13 Evaporative Emission Canister Vent Solenoid Valve - Blocked / Restricted / Visible Damage
    • Evaporative Emission Canister - Blocked / Defective / Restricted / Visible Damage
    • Evaporative Emission Canister Purge Hose - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
    • Evaporative Emission Canister Vent Hose - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
    • Evaporative Emission Canister Vent Pipe - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
    • Evaporative Emission Vent Filter - Blocked / Dirty / Restricted / Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  2. Install any previously removed components.
  3. Perform the following action:
    • { Cap Type Fuel Fill } Remove - Fuel Tank Filler Cap

      Install - CH-41415-30 Fuel Tank Cap Adapter

    • { Capless Type Fuel Fill } Install - GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter @ Door @ Fuel Tank Filler Pipe
  4. Perform the following action:
    • { Cap Type Fuel Fill } Install - GE-41413-A / B Evaporative Emissions System Tester (EEST) - Hose @ CH-41415-30 Fuel Tank Cap Adapter
    • { Capless Type Fuel Fill } Install - GE-41413-A / B Evaporative Emissions System Tester (EEST) - Hose @ GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter
  5. Ignition - On / Vehicle - In Service Mode
    6. NOTE:
    • Before proceeding with this test, review the Tool User Manual for Safety Information and Instructions: GE-41413-A / B Evaporative Emissions System Tester (EEST)
    • The User Manual that is supplied with the tool, is also available online, refer to: GM Special Service Tools
    • Make sure the underbody temperature of the vehicle and the tester temperature are similar.
    • Completely unwind the nitrogen/smoke hose from the bracket to optimize the tester's performance.
  6. Perform the following action:
    1. Select - Nitrogen @ GE-41413-A / B Evaporative Emissions System Tester (EEST)
    2. Perform the scan tool function: Evaporative Emission Canister Vent Valve - Not Venting
    3. Press and release the switch: Remote Switch @ GE-41413-A / B Evaporative Emissions System Tester (EEST) - Special Tool = On or Activated
      NOTE:

      Do NOT exceed the specified value or incorrect test results may occur.

      Use the tool to achieve a gauge reading of 9.3 mmHg (5.0 in H2O)

  7. Perform the scan tool function: Evaporative Emission Canister Vent Valve - Venting

    Verify the scan tool parameter: Fuel Tank Pressure Sensor = 0.0 mmHg (0.0 in. H2O)

    • If not the specified value 
    1. Ignition/Vehicle - Off
    2. Verify the following conditions do not exist:
      • Q13 Evaporative Emission Canister Vent Solenoid Valve - Blocked / Restricted / Visible Damage
      • Evaporative Emission Canister - Blocked / Defective / Restricted / Visible Damage
      • Evaporative Emission Canister Purge Hose - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
      • Evaporative Emission Canister Vent Hose - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
      • Evaporative Emission Canister Vent Pipe - Blocked / Defective / Incorrect Connection / Connection / Restricted / Visible Damage
      • Evaporative Emission Vent Filter - Blocked / Dirty / Restricted / Visible Damage
      • If a condition exists - Repair or replace as necessary
      • Go to next step: If no condition exists
    3. Replace the component: Q13 Evaporative Emission Canister Vent Solenoid Valve
    • Go to next step: If the specified value 
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Repeat the procedure starting at step 1

    • Go to next step: If the DTC does not set 
  9. All OK.
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