Fuel Tank Pressure Sensor: Testing and Inspection
NOTE:- Perform the following test only when directed.
- The following vacuum values are indicated by relative pressure from barometric pressure.
1. Remove the PCM.
2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector bolt.
Tightening torque
7.9 - 10.7 N.m {80 - 110 kgf.cm, 69.5 - 95.4 in.lbf}
CAUTION: Do not apply a vacuum outside the specified limits. Doing so will damage the fuel tank pressure sensor.
4. Turn the ignition switch on.
5. Apply pressure then a vacuum to the fuel tank pressure sensor according to the following procedure.
NOTE: The output voltage varies with the measuring condition.
6. Decrease the applied pressure from +6.66 kPa {+50 mmHg, +1.97 inHg} to -6.66 kPa {-50 mmHg, -1.97 inHg} and verify that the PCM terminal 62 voltage decreases accordingly as specified.
- If not as specified, replace the fuel tank pressure sensor.
- If fuel tank pressure sensor is okay, but PCM terminal 62 voltage is out of specification, carry out the "Circuit Open/Short Inspection".
Specification:
* : Measuring condition is as follows
Input voltage: 5.0 V
Barometric pressure: 101.3 kPa {760 mmHg, 29.9 inHg} (Absolute pressure)
Barometric temperature: 30 - 100 °C {0 - 182 °F}
Circuit Open/Short Inspection
1. Remove the PCM.
2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.
Tightening torque
7.9 - 10.7 N.m {80 - 110 kgf.cm, 69.5 - 95.4 in.lbf}
4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals with ohmmeter leads.
- If there is an open or short circuit, repair or replace wiring harnesses.
- If there is no open or short circuit, replace the fuel tank pressure sensor.
Open circuit
- Fuel tank pressure signal circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 62)
- Constant voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 90)
- GND circuit (Fuel tank pressure sensor connector terminal A and PCM connector terminal 91)
Short circuit
- Fuel tank pressure signal circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 62)
- Constant voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 90)
5. Reconnect the fuel tank pressure sensor connector.