Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p1451 evap system clog detected (pipe)

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p1451 evap system clog detected (pipe)

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEP	CHECK	YES	NO
1.CHECK DRAIN TUBE BETWEEN CANISTER AND LEAK CHECK VALVE ASSEMBLY.	Is the drain tube between canister and leak check valve assembly clogged-	Replace the drain tube between the canister and leak check valve assembly. Canister	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1451 EVAP SYSTEM CLOG DETECTED (PIPE)
2.CHECK HOSE AND TUBE BETWEEN CANISTER AND FUEL TANK.	Are the hose and tube between the canister and fuel tank clogged-	Replace the hose or tube between the canister and fuel tank. Canister Fuel Tank	Replace the canister. Canister After the operation is complete, go to the next step. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1451 EVAP SYSTEM CLOG DETECTED (PIPE)
3.CHECK EVAPORATIVE EMISSION CONTROL SYSTEM. Perform drive cycle I. Drive Cycle > PROCEDURE	Is DTC P1451 displayed on the display-	Replace the leak check valve assembly. Leak Check Valve Assembly	End.

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0455. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0455 EVAP SYSTEM (CPC) LEAK DETECTED (LARGE LEAK)

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Other materials:

Removal
1. Shift the select lever to “N” range.2. Disconnect the ground terminal from battery sensor. NOTE3. Lift up the vehicle.4. Remove the center exhaust pipe. (2.5 L model) Center Exhaust Pipe > REMOVAL5. Remove the front exhaust pipe and rear exhaust pipe. (3.6 L model) Front Exhaust Pi ...