P2404
DTC P2404DTC Detecting Condition and Trouble Area
Wiring Diagram
Wiring Diagram:
System Description
EVAP Leak Check System Description
ECM boots up EVAP leak check system after 5 hours from turning off the ignition switch, and ECM starts EVAP leak monitoring by operating EVAP leak check module (1).
EVAP leak check module consists of EVAP leak check pressure sensor (2), EVAP canister vent valve (3), EVAP leak detection pump (4) and reference orifice (5).
ECM (17) executes EVAP system monitoring by the following step.
1. ECM measures EVAP system initial pressure (P1) by EVAP leak check pressure sensor while EVAP canister vent valve is opened (OFF) and EVAP leak detection pump is not operated (OFF).
2. ECM measures vacuum as reference pressure (P2) which is generated by getting suction air of EVAP leak detection pump through reference orifice (equivalent of 0.5 mm (0.02 in.) diameter hole) while EVAP canister vent valve opened (OFF) [A] and EVAP leak detection pump operated (ON).
3. ECM measures tank pressure as EVAP system maximum pressure (P3) when EVAP canister vent valve is closed (ON) [B] with EVAP leak detection pump operated.
4. ECM measures vacuum as EVAP system minimum pressure (P4) while EVAP canister vent valve is closed (ON) with EVAP leak detection pump operated.
5. ECM compares reference pressure to minimum pressure in EVAP system.
If the EVAP system minimum pressure is higher than the reference pressure, the system contains a leak which is greater than or equal to a leak caused by a 0.5 mm (0.02 in.) diameter orifice.
If the fuel is charged to vehicle during EVAP system monitoring, ECM stops EVAP system monitoring.
If ECM detects EVAP leak check module malfunction, ECM stops EVAP system monitoring and store the applicable DTC. When starting the engine after detecting the DTC, ECM turns on the MIL.
System Diagram
DTC Confirmation Procedure
CAUTION:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out by 2 persons, a driver and a tester, on a level road.
NOTE:
- If DTC other than aimed DTC are previously detected in DTC confirmation procedure, be sure to troubleshoot DTC previously detected.
- Check that the following conditions are satisfied when using this procedure.
- 4.4 °C (39.9 °F) < ECT < 50 °C (122 °F)
- 4.4 °C (39.9 °F) < IAT < 50 °C (122 °F)
- BARO > 75 kPa (0.8 kgf/cm2, 10.8 psi, 0.75 bar)
- Fuel level < 85%
1. Warm up engine to normal operating temperature.
2. Drive vehicle for 40 km/h (25 mile/h) for 15 min.
3. Turn ignition switch to OFF position for 6 hours.
DTC Troubleshooting
