DTC P24B9: EVAP System Leak Detection Pump Pressure Sensor Circuit Range/Performance: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC other than P24B9 displayed? (Current malfunction)

Yes: 

Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

No: 

Go to  2.

1. Turn the ignition switch to ON (engine OFF).
2. Using the Subaru Select Monitor or a general scan tool, read the values of [Evap System Vapor Pressure] and [Intake Manifold Absolute Pressure] to compare with actual atmospheric pressure.
   NOTE:

   • SUBARU SELECT MONITOR

     For detailed operation procedures, refer to "Data Monitor". Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>DATA MONITOR .

   • General scan tool

     For detailed operation procedures, refer to the general scan tool operation instructions.

   • To read the actual atmospheric pressure, connect the Subaru Select Monitor or general scan tool to the other known good vehicle.

   Is the difference with the actual atmospheric pressure 2.53 kPa (18.98 mmHg, 0.75 inHg, 0.37 psi) or more?

   Yes: 

   Replace the part that showed larger deviation from the actual atmospheric pressure than the other.

   • If deviations in value for [Absolute Evap Sys. Pressure] is larger: Replace the leak check valve assembly. Refer to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>LEAK CHECK VALVE ASSEMBLY .
   • If deviations in value for [Mani. Absolute Pressure] is larger: Replace the manifold absolute pressure sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR .

   No: 

   Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.