Function Explanation (DTC Detection Outline)
WARNING: This page is about a different variant/trim than selected.
- The pressure change of the evaporative gas passage is measured using barometric pressure and intake manifold vacuum to detect evaporative gas leakage. The PCM introduces barometric pressure or intake manifold vacuum into the evaporative gas passage by opening/closing the purge solenoid valve and CV solenoid valve, and measures the pressure change using the fuel tank pressure sensor.
- After the engine stops with the preconditions met, the PCM closes the CV solenoid valve and seals the fuel tank. The pressure change of the fuel tank is measured by the fuel tank pressure sensor after the fuel tank is sealed. The PCM determines a temporary malfunction when the pressure change is the specified value or less after the specified time has elapsed since the pressure was measured. If the CV solenoid valve is open after determining a temporary malfunction and the pressure change of the fuel tank is the specified value or less, the PCM determines that there is an evaporative gas leakage and a DTC is stored.
PCM COMPONENT OPERATIONS
| Component No. | Refer to |
|---|---|
| 1 | Purge solenoid valve drive signal |
| 2 | CV solenoid valve drive signal |
| 3 | Pressure in fuel tank |
| 4 | Off (close) |
| 5 | On (close) |
| 6 | Off (open) |
| 7 | Determined value |
| 8 | Barometric pressure |
| 9 | Fuel evaporates by heat during driving and pressure in tank rises |
| 10 | Atmospheric pressure introduced |
| 11 | Pressure in tank lowers due to fuel condensation in fuel tank |
| 12 | P0456:00 Recorded |
| 13 | Time |
| 14 | Normal |
| 15 | Malfunction |