Fuel Tank Pressure Sensor: Testing and Inspection

NOTE:The following vacuum and pressure values are indicated by relative pressure from atmospheric pressure.




1. Connect the SSTs (NGS tester) to the data link connector-2 located under the driver side dashboard.




2. Select the "PID/DATA MONITOR AND RECORD" function on the NGS tester display.
3. Select "FTP V" on the NGS tester display and press START. The NGS tester measures and shows the voltage.
4. Turn the ignition switch ON.

CAUTION: Do not apply a vacuum or pressure outside of the specified limits. Doing so will damage the fuel tank pressure sensor.

5. Apply pressure then vacuum to the fuel tank pressure sensor according to the following procedure.




6. Decrease the application pressure from +6.7 kPa {+50 mmHg, +2.0 inHg}to -6.7 kpa(-50 mmHg, -2.0 inHg} and verify that the voltage at "FTP V" decease accordingly.

Referance Chart:

NOTE: The output voltage varies with the measuring condition.

Measuring condition
- Input voltage - 5 V
- Outside pressure - 25°C {77°F}
- Atmospheric pressure - 101.3 kPa (760 mmHg, 29.9 inHg}

"FTP V" PID value (Reference)

7. If not as specified, perform the following inspection.




(1) Harness continuity
- Between PCM terminal 3A and fuel tank pressure sensor terminal A
- Between PCM terminal 30 and fuel tank pressure sensor terminal B
- Between PCM terminal 31 and fuel tank pressure sensor terminal C
(2) Terminal voltage
- Fuel tank pressure sensor terminal A voltage:
Below 1.0 V (Constant)
- Fuel tank pressure sensor terminal C voltage:
Approx. 5.0 V (Ignition switch ON)
8. If terminal voltage is correct and there is harness continuity, replace the fuel tank pressure sensor.