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Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.3L - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0455 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT:
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  • Refer to the J 41413-200  evaporative emissions system tester operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  1. Connect the J 41413-200  evaporative emissions system tester to the vehicle EVAP service port. For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  EVAP service access port tool.
  2. Use a scan tool to seal the EVAP system.
  3. Use the flow meter on the J 41413-200  evaporative emissions system tester, calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the J 41413-200  evaporative emissions system tester to apply smoke to the EVAP system at the service port or the purge tube until the leak is located using the GE-41413-SPT  high intensity white light.
  4. To test for a restriction in the purge path, connect the J 41413-200  evaporative emissions system tester nitrogen/smoke hose to the J-41413-311  brass cone adapter. Disconnect the hose at the fuel cap end of the GE-41415-50  fuel tank cap adapter. Connect the J-41413-311  brass cone adapter to the disconnected hose on the GE-41415-50  fuel tank cap adapter. Install the GE-41415-50  fuel tank cap adapter filler neck end only to the vehicle.
  5. Allow the engine to idle.
  6. Use the Purge/Seal function to seal the system with a scan tool.
  7. Command the EVAP canister purge solenoid valve to 30 percent.
  8. The vacuum/pressure gauge on the J 41413-200  evaporative emissions system tester and the FTP parameter on the scan tool should both show vacuum.
    • If the vacuum/pressure gauge shows vacuum, but the FTP parameter does not show vacuum, replace the FTP sensor.
    • If neither the FTP parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
  9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the values are similar between the scan tool and the vacuum/pressure gauge on the J 41413-200  evaporative emissions system tester.
    • If the values are not similar, or the voltage did not reach 3.2 volts, replace the FTP sensor.
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