Fuel Tank Pressure (FTP) Sensor Check - Oldsmobile 1998 Eighty-Eight V6-3.8L VIN K Service Manual

Fuel Tank Pressure (FTP) Sensor Check

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The J 41413-200 EEST provides a tight seal to the nitrogen/smoke hose when the tester is turned off. This allows pressurizing of the sealed EVAP system. Use the following procedure to test for a functional FTP sensor.

1. Turn ON the ignition with the engine OFF.

2. Connect the EEST red battery clip to the positive (+) battery terminal. Connect the black battery clip to chassis ground.

3. Install the appropriate fuel fill cap adapter to the fuel fill pipe. Refer to the Service Information for the appropriate fuel fill cap adapter part number.

4. Connect the EEST's nitrogen/smoke supply hose and vehicle fuel fill cap to the adapter.

5. Compare the FTP parameter, with a scan tool, to the EEST pressure/vacuum gage.

6. If the FTP parameter is not within 1 in H20 of the EEST pressure/vacuum gage, replace the FTP sensor.

7. Command the vent valve closed with a scan tool.

8. Turn the nitrogen/smoke valve on the EEST control panel to Nitrogen.

9. Use the remote switch to introduce nitrogen into the EVAP system.

10. Observe the Fuel Tank Pressure (FTP) parameter with a scan tool. The FTP sensor parameter should increase to more than 5 in H20.

11. If the FTP parameter is not more that 5 in H20, replace the FTP sensor.

12. If the FTP parameter is more than 5 in H20, continue with appropriate Service Information.