DTC P0451 EVAP System (CPC) Pressure Sensor/Switch Circuit Range/Performance: Notes
WARNING: This page is about a different variant/trim than selected.
DTC detecting condition:
Detected when two consecutive driving cycles with fault occur.
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode>OPERATION
. and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode>PROCEDURE
.
- CHECK FOR ANY OTHER DTC ON DISPLAY
.
Is any other DTC displayed?
- Yes: Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>List of Diagnostic Trouble Code (DTC) .
- No: Go to 2 .
- CHECK DATA MONITOR
.
- Turn the ignition switch to ON (engine OFF).
- Using the Subaru Select Monitor or a general scan tool, read the values of [Barometric Pressure] and [Intake Manifold Absolute Pressure] to compare with actual atmospheric pressure.
NOTE:- Subaru Select Monitor
For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor .
- General scan tool
For detailed operation procedures, refer to the general scan tool operation manual.
- 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 2.3 kPa (17.25 mmHg, 0.68 inHg) or more?
- Yes: Replace the part that showed larger deviation from the actual atmospheric pressure than the other.
- If deviations in value for [Barometric 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.NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.