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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 J 41413-200:  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 purge solenoid valve and install the CH 48096:  Port Tool. Connect the J 41413-200:  EEST to the CH 48096:  Port Tool.
  2. Use a scan tool to seal the system and use the flow meter on the J 41413-200:  EEST, 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:  EEST to apply smoke to the EVAP system at the service port or the filler neck until the leak is located.
  3. Connect the J 41413-200:  EEST nitrogen/smoke hose to the J 41413-311:  EVAP Plug brass cone adapter. Disconnect the hose at the fuel cap end of the GE 41415-50:  Adapter. Connect the J 41413-311:  EVAP Plug to the disconnected hose on the GE 41415-50:  Adapter. Install the GE 41415-50:  Adapter filler neck end only to the vehicle.
  4. Start the engine.
  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 20 percent.
  8. The vacuum/pressure gage on the J 41413-200:  EEST and the FTP parameter on the scan tool should both show vacuum.
    • If the vacuum/pressure gage shows vacuum but the FTP parameter does not show vacuum, replace the FTP sensor.
    • If neither the FTP parameter nor the vacuum/pressure gage 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 value is similar between the scan tool and the vacuum/pressure gage on the J 41413-200:  EEST.
    • If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.
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