P2400
DTC P2400: Evaporative Emission System Leak Detection Pump Control Circuit OpenWiring 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.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition And Trouble Area:
DTC Confirmation Procedure
1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC by using scan tool, and then wait for 10 sec. or more.
3. Check DTC.
DTC Troubleshooting
