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

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC other than P24B9 displayed? (Current malfunction)

      Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

      No:  Go to  2.

2. CHECK DATA MONITOR. 
   1. Turn the ignition switch to ON (engine OFF).
   2. Using the Subaru Select Monitor, read the values of [Evap System Vapor Pressure] and [Intake Manifold Absolute Pressure] to compare with actual atmospheric pressure.
      NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

   Is the difference with the actual atmospheric pressure 2.53 kPa (18.98 mmHg, 0.75 in Hg, 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. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>LEAK CHECK VALVE ASSEMBLY .
   • If deviations in value for [Mani. Absolute Pressure] is larger: Replace the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>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.