Fuel Tank Pressure Sensor: Testing and Inspection
FUEL TANK PRESSURE SENSOR INSPECTIONNOTE: The following vacuum and pressure values are indicated by relative pressure from atmospheric pressure.
1. Connect the Special Service Tools (Engine Signal Monitor) to the PCM.
CAUTION: Do not apply a vacuum or pressure outside of the specified limits. Doing so will damage the fuel tank pressure sensor.
2. Apply pressure then a vacuum to the fuel tank pressure sensor according to the following procedure.
3. Decrease the applied pressure from 6.7 kPa (2.0 in.Hg) to -6.7 kPa (-2.0 in.Hg) and verify that the PCM terminal 3A voltage decreases accordingly.
NOTE: The output voltage varies with the measuring condition.
Measuring condition
- Input voltage - 5 V
- Outside temperature - 25°C (77°F)
- Atmospheric pressure - 101.3 kPa (29.9 in.Hg)
4. If not as specified, perform the following inspection.
a. Harness continuity
- Between PCM terminal 30 and fuel tank pressure sensor terminal A
- Between PCM terminal 3A and fuel tank pressure sensor terminal B
- Between PCM terminal 3I and fuel tank pressure sensor terminal C
b. 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)
5. If terminal voltage is correct and there is harness continuity, replace the fuel tank pressure sensor.