Fuel Tank Pressure Sensor: Testing and Inspection

Inspection




1. Check sensor air vent hole and pressure passage for clog. Clean if clogged.
2. Check sensor O-ring for damage and deterioration. Replace as necessary.




3. Arrange 3 new 1.5 V batteries in series (check that total voltage is 4.5 - 5.0 V) and connect its positive terminal to "Vin" terminal of sensor and negative terminal to "Ground" terminal. Then check voltage between "Vout" and "Ground".
Also, check if voltage reduces when vacuum is applied up to 6.6 kPa (50 mmHg) by using vacuum pump and if it increases when positive pressure applied up to 6.6 kPa (50 mmHg) by using hand pump.
If measured voltage doesn't shown such characteristic as shown in left figure, replace.