Part 3
2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E: Evaporative Emission System Reference Orifice Clog Up - Continued
DTC P043E - Evaporative Emission System Reference Orifice Clog Up
DTC P043F - Evaporative Emission System Reference Orifice High Flow
DTC P2401 - Evaporative Emission Leak Detection Pump Stuck OFF
DTC P2402 - Evaporative Emission Leak Detection Pump Stuck ON
DTC P2419 - Evaporative Emission System Switching Valve Control Circuit Low
MONITOR DESCRIPTION
In sequence B and E, the leak detection pump creates negative pressure (vacuum) through the reference orifice. The EVAP system pressure is then measured by the ECM (included in the hybrid vehicle control ECU), using the canister pressure sensor, to determine the reference pressure. If the pressure is one of the following conditions, the ECM illuminates the MIL and sets the DTC (2-trip detection logic).
- Canister pressure is lower than the malfunction criterion (ex. 724 mmHg).
- Canister pressure is higher than the malfunction criterion (ex. 752 mmHg).
- Canister pressure is not saturated within 60 seconds.
- Canister pressure difference of sequence B and sequence E is large.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Example of restart time
Key-off monitor sequence 1 to 15
1. Atmospheric pressure measurement
2. First reference pressure measurement
3. Vent valve stuck closed check
4. Vacuum introduction for canister
5. Purge VSV stuck closed check
6. Second reference pressure measurement
7. Canister leak
8. Fuel vapor-containment valve (FVCV stuck closed check)
9. Vacuum introduction for fuel tank
10. FVCV stuck closed check
11. FTP sensor stuck check
12 Third reference pressure measurement
13. Fuel tank leak check
14. FTP sensor stuck check
15. Atmospheric pressure measurement
TYPICAL MALFUNCTION THRESHOLDS
"Saturated" indicates that the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) in 30 seconds.
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.