DTC Summary
WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
| DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
| P1420 |
Evaporative Emission Canister Small Leak |
Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak. |
- EVAP leak (purge VSV - canister - fuel vapor-containment valve)
- Purge VSV
- Connector/wire harness (purge VSV - ECM)
- Canister pump module
- ECM
|
Comes on |
DTC stored |
| P1421 |
Evaporative Emission Canister Gross Leak |
Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the 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. |
- EVAP leak (purge VSV - canister - fuel vapor-containment valve)
- Purge VSV
- Connector/wire harness (purge VSV - ECM)
- Canister pump module
- ECM
|
Comes on |
DTC stored |
| DTC No. |
Monitoring Item |
Detection Timing |
Detection Logic |
| P1420 |
Canister small leak |
While power switch is off |
2 trip |
| P1421 |
Canister gross leak |