Monitor Description
- P1420: EVAP (Evaporative Emission) very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than the second 0.02 inch leak pressure standard, the ECM (included in the HV control ECU) determines that the EVAP system has a large leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
- P1421: EVAP very gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than (second 0.02 inch leak pressure standard x 0.2) (near atmospheric pressure), the ECM (included in the HV control ECU) determines that the EVAP system has a large leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).