Part 1

1AR-FE ENGINE CONTROL: SFI SYSTEM: P043E,P043F,P2401,P2402,P2419: Evaporative Emission System Leak Detection Reference Orifice Low Flow


DTC SUMMARY





HINT
The reference orifice is located inside the canister pump module.

DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System Component Tests and General Diagnostics.

HINT
Unit expressions

- [kPa-a (mmHg-a)] denotes the absolute pressure.
- On the Techstream, convert the unit of measurement according to the inspection procedure.

INSPECTION PROCEDURE

Refer to EVAP System Component Tests and General Diagnostics.

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.





*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.





The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is between 97 to 100 kPa-a (724 to 750 mmHg-a)* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicates that the EVAP pressure change is below 0.286 kPa (2.14 mmHg) in 60 seconds.





MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

(continued)