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Home >> Toyota >> 2019 >> Sienna SE, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Control System [2GR-FE] - Diagnostic Codes (2 Of 3)) >> SFI System >> DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak); DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) [12/2015 - 08/2016] >> DTC Summary

DTC Summary

WARNING: This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic
P0455 EVAP gross leak Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. reference pressure is measured at start and end of leak check.
If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak.
  • Fuel cap (loose)
  • Leakage from EVAP line (canister assembly - fuel tank)
  • Leakage from EVAP line (purge VSV - canister assembly)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister assembly
 While ignition switch off 2 trip
P0456 EVAP small leak Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure measured at start and end of leak check.
If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.		 While ignition switch off 2 trip
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