Subaru Crosstrek Service Manual: Dtc p1449 evap system clog detected (air filter)

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p1449 evap system clog detected (air filter)

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)

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 FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)">Go to Step 2.

2.CHECK DRAIN TUBE B OF LEAK CHECK VALVE ASSEMBLY.

Is the drain tube B of leak check valve assembly clogged?

Replace the drain tube B of leak check valve assembly. Leak Check Valve Assembly">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)">Go to Step 3.

3.CHECK DRAIN HOSE AND DRAIN TUBE C BETWEEN LEAK CHECK VALVE ASSEMBLY AND DRAIN SEPARATOR.

Is the drain hose or the drain tube C between leak check valve assembly and drain separator clogged?

Replace the drain hose or the drain tube C between leak check valve assembly and drain separator. Drain Separator">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)">Go to Step 4.

4.CHECK DRAIN SEPARATOR.

Is the drain separator clogged?

Replace the drain separator. Drain Separator">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)">Go to Step 5.

5.CHECK INTAKE HOSE AND CONNECTOR BETWEEN DRAIN SEPARATOR AND VEHICLE BODY.

Is the intake hose or the connector between drain separator and vehicle body clogged?

Replace the intake hose or the connector between drain separator and vehicle body. Drain Separator">

Replace the leak check valve assembly. Leak Check Valve Assembly">

1. OUTLINE OF DIAGNOSIS

Detect the drain filter clogging by the pressure change during purge introduction.

Judge as drain filter clogging malfunction if the pressure in the evaporative emission system piping suddenly decreases by the purging.

2. COMPONENT DESCRIPTION

(1)	Leak check valve ASSY	(5)	Vacuum pump	(9)	Fuel tank
(2)	Switching valve	(6)	Drain filter	(10)	Canister
(3)	Reference orifice (0.02 inch orifice)	(7)	Purge control solenoid valve
(4)	Pressure sensor	(8)	Intake manifold

3. EXECUTION CONDITION

Secondary parameters	Execution condition
Battery voltage	≥ 10.9 V
Elapsed time after ignition switch ON	≥ 20000 ms
Evaporative Leak Check Module vacuum pump	Not in operation
Evaporative Leak Check Module switching valve	Open

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously when purging is performed after 20000 ms have passed since the engine started.

5. DIAGNOSTIC METHOD

Calculate the difference between the Evaporative Leak Check Module pressure sensor output value of 5 seconds ago and the value at the present moment, and if the value is greater than the judgment value, detect as filter clogging trouble and judge as malfunction.

Judge as NG when the following conditions are established.

Judgment value

Malfunction Criteria	Threshold Value
\|Pressure sensor output value as of 5 seconds ago − Current pressure sensor output value\|	> Value from Map

Map

Vehicle speed km/h (MPH)	0 (0)	20 (12.4)	40 (24.9)	60 (37.3)	80 (49.7)	100 (62.1)	120 (74.6)	300 (186.4)
\|Pressure sensor output value as of 5 seconds ago − Current pressure sensor output value\| kPa (mmHg, inHg)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	1.4 (10.352 , 0.4)	2.4 (18.287 , 0.7)

Vehicle speed

km/h (MPH)

0 (0)

20 (12.4)

40 (24.9)

60 (37.3)

80 (49.7)

100 (62.1)

120 (74.6)

300 (186.4)

|Pressure sensor output value as of 5 seconds ago − Current pressure sensor output value|

kPa (mmHg, inHg)

1.4 (10.352 , 0.4)

2.4 (18.287 , 0.7)

Time needed for diagnosis: 1 seconds

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Dtc p1160 throttle return spring

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)DTC P1160 THROTTLE RETURN SPRINGNOTE:For the diagnostic procedure, refer to DTC P2101. Diagnostic Procedure with ...

Dtc p1451 evap system clog detected (pipe)

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 wi ...

Other materials:

Removal
HVAC SYSTEM (HEATER, VENTILATOR AND A/C) > CompressorREMOVAL1. CROSSTREK MODEL1. Perform compressor oil return operation. Compressor Oil > PROCEDURE">2. Turn the A/C switch to OFF, and turn the ignition switch to OFF.3. Using the refrigerant recovery system, discharge refrigerant. Re ...

Installing a rearward facing child restraint
1. Place the child restraint system in the rear seating position. 2. Run the lap and shoulder belt through or around the child restraint system following the instructions provided by its manufacturer. 3. Insert the tongue plate into the buckle until you hear a click. 4. Take up t ...

Assembly
MANUAL TRANSMISSION AND DIFFERENTIAL(5MT) > Front Differential AssemblyASSEMBLY1. DIFFERENTIAL CASE ASSEMBLY1. Install the differential bevel gear and differential bevel pinion together with adjusting washer, and insert the pinion shaft.NOTE:Face the chamfered side of adjusting washer toward beve ...