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Circuit/System Testing

NOTE:
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  • Refer to the GE 41413-A  Evaporative Emissions System Tester (EEST)operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the Q12 evaporative emission purge solenoid valve. Install the CH 48096  EVAP Service Access Port Tool between the disconnected purge tube and the purge solenoid valve. Connect the GE 41413-A  EEST to the service access port tool.
  2. Ignition ON, use a scan tool to seal the EVAP system.
  3. Use the flow meter on the GE 41413-A  EEST, calibrated to 0.51 mm (0.020 inch) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the GE 41413-A  EEST to apply smoke to the EVAP system at the purge tube until the leak is located using the J 41413-SPT  High Intensity White Light.
  4. To test for a restriction, connect the GE 41413-A  EEST nitrogen/smoke hose to the to the J 41413-311  Evaporative Emission Plug brass cone adapter. Disconnect the hose at the fuel cap end of the J 41415-30  Fuel Tank Cap Adapter. Connect the J 41413-311  EVAP Plug to the disconnected hose on the J 41415-30  Fuel Tank Cap Adapter. Install the J 41415-30  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 Purge Solenoid Valve to 30 %.
  8. The vacuum/pressure gauge on the GE 41413-A  EEST 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 B150 fuel tank pressure 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 V, and the values are similar between the scan tool and the vacuum/pressure gauge on the GE 41413-A  EEST.
    • If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.
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