Fuel Tank Pressure Sensor: Testing and Inspection

NOTE: Perform the following test only when directed.

Voltage Inspection

Using the SST (104 pin breakout box)

1. Turn the ignition switch to LOCK.
2. Disconnect the PCM connector.




3. Connect the SST (104 Pin Breakout Box) to the PCM connector and the PCM as shown.
4. Tighten the connector attaching bolt.

Tightening torque
3.0 - 5.4 N.m (30 - 56 kgf.cm, 27 - 48 in.lbf}

5. Turn the ignition switch to ON.




6. Disconnect the vacuum hose between the fuel tank pressure sensor and the charcoal canister.

CAUTION: Do not apply vacuum out of specification. Doing so will damage the fuel tank pressure sensor.

7. Apply pressure then vacuum to the fuel tank pressure sensor according to the following procedure.
1. 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, perform the "Circuit Open/Short Inspection".





NOTE
- The output voltage varies with the measuring condition.
- Input voltage 4.5 - 5.5 V
- Outside temperature 10 - 50 °C {50 - 122 °F}
- Sea level -200 - 3,000 m {-656 - 9,840 ft}

Using the SST (NGS tester)

1. Turn the ignition switch to ON.




2. Disconnect the vacuum hose between the fuel tank pressure sensor and charcoal canister.

CAUTION: Do not apply vacuum out of specification. Doing so will damage the fuel tank pressure sensor.

3. Apply pressure then vacuum to the fuel tank pressure sensor according to the following procedure.
1. 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 FTP V PID decreases accordingly as specified.
- If not as specified, perform the "Circuit Open/Short Inspection".





NOTE
- The output voltage varies with the following condition.
- Input voltage 4.5 - 5.5 V
- Outside temperature 10 - 50 °C {50 - 122 °F}
- Sea level -200 - 3,000 m {-656 - 9,840 ft}

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




2. Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
3. Tighten the connector attaching bolt.

Tightening torque
3.0 - 5.4 N.m (30 - 56 kgf.cm, 27 - 48 in.lbf}




4. Inspect the following wiring harness for open or short (Continuity check).

Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- FTP sensor terminal C (harness-side) and 104 pin breakout box terminal 90
- FTP sensor terminal A (harness-side) and 104 pin breakout box terminal 62
- FTP sensor terminal B (harness-side) and 104 pin breakout box terminal 91

Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- FTP sensor terminal C (harness-side) and power supply
- FTP sensor terminal C (harness-side) and body ground
- FTP sensor terminal A (harness-side) and power supply
- FTP sensor terminal A (harness-side) and body ground
- TP sensor terminal B (harness-side) and power supply