P1424
DTC P1424: Evaporative Emission System Leak Detection Pump Flow HighWiring Diagram
System Diagram:
Wiring Diagram:
System Description
ECM boots up EVAP leak check system after 5 hours from ignition switch off and ECM starts EVAP leak check by operating EVAP leak check module (1).
EVAP leak check module consists of EVAP leak check pressure sensor (2), EVAP vent valve (3), EVAP leak detection pump (4) and reference orifice (5).
ECM (17) executes EVAP leak check by the following step.
NOTE: If ECM detects EVAP leak check system malfunction by measuring EVAP leak check pressure (P1 - P4 and P6 - P8), ECM stops EVAP leak check and store it as applicable pending DTC. When starting engine after detecting the same system malfunction two times, ECM turns on MIL.
1. Barometric Pressure Check:
ECM measures barometric pressure (P0) by EVAP leak check pressure sensor while EVAP vent valve is opened (OFF) and EVAP leak detection pump is not operated (OFF).
2. Reference Pressure-1 Check:
ECM measures vacuum as reference pressure-1 (P3) which is generated by EVAP leak detection pump through reference orifice (equivalent of 0.5 mm (0.02 in.) diameter hole) while EVAP vent valve opened (OFF) and EVAP leak detection pump operated (ON).
3. Leak Detecting Pressure Check:
ECM measures vacuum as leak detecting pressure (P5) while EVAP vent valve is closed (ON) with EVAP leak detection pump operated.
4. Reference Pressure-2 Check:
After operating EVAP canister purge valve from close to open then close, ECM measures vacuum as reference pressure-2 (P8) which is generated by EVAP leak detection pump through reference orifice while EVAP vent valve opened (OFF) and EVAP leak detection pump operated (ON).
5. EVAP Leak Check:
ECM compares reference pressure-2 (P8) to leak detecting pressure (P5). If leak detecting pressure (P5) is higher than reference pressure-2 (P8), EVAP system contains a leak which is greater than a leak caused by a 0.5 mm (0.02 in.) diameter orifice.
System Diagram
System Diagram:
DTC Detecting Condition and Trouble Area
DTC Detecting Condition And Trouble Area:
DTC Confirmation Procedure
NOTE: Check to make sure that following conditions are satisfied when using this "DTC Confirmation Procedure".
^ Intake air temperature: Between 4.4 °C (40 °F) and 50 °C (122 °F)
^ Engine coolant temperature: Between 4.4 °C (40 °F) and 45 °C (113 °F)
^ Fuel level: 85% or less
^ Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
^ The following DTCs are not detected: DTCs related to EVAP leak pressure sensor, EVAP leak detection pump, EVAP vent valve and EVAP canister purge valve.
1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Start engine and warm up to normal operating temperature.
4. Increase vehicle speed to 25 mph (40 km/h) or more.
5. Keep above vehicle speed for 15 min.
6. Confirm that any DTC are not detected.
7. Turn ignition switch OFF and leave for 6 hours.
8. Check DTC and pending DTC.
DTC Troubleshooting
