Fuel Tank Pressure and Temp. Sensor Inspection

Check sensor air vent hole and pressure passage for clog. Clean if clogged.

Fig 1: Inspecting Sensor Air Vent Hole & Pressure Passage
Courtesy of SUZUKI OF AMERICA CORP.
Arrange 3 new 1.5 V batteries (2) in series (check that total voltage is 4.5 - 5.0 V) and connect its positive terminal to "A" terminal of tank pressure and temp. sensor (1) and negative terminal to "B" terminal. Then check voltage between "C" and "B".
Also, check if voltage reduces when vacuum is applied up to 6.6 kPa (50 mmHg) by using vacuum pump (3) and if it increases when positive pressure applied up to 6.6 kPa (50 mmHg) by using hand pump.

If measured voltage doesn't show such characteristic as shown in the figure, replace fuel tank pressure and temp. sensor.
CAUTION:
- As connection to wrong terminal will cause damage to tank pressure and temp. sensor, make absolutely sure to connect properly as shown.
- Do not apply pressure higher than 98 kPa (742 mmHg) to tank pressure and temp. sensor by hand pump. Applying excessive pressure will break it.
Fig 2: Inspecting Fuel Tank Pressure & Temp. Sensor
Courtesy of SUZUKI OF AMERICA CORP.
Immerse temperature sensing part (1) of fuel tank pressure and temp. sensor (2) in water (or ice) and measure resistance between sensor terminal "A" and "B" while heating water gradually.
If measure resistance doesn't show such characteristic as shown in the figure, replace fuel tank pressure and temperature sensor.

Fig 3: Measure Resistance Between Sensor Terminal "A" & "B"

Courtesy of SUZUKI OF AMERICA CORP.