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Subaru Legacy Service Manual: 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.

STEPCHECKYESNO

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)

2.CHECK CANISTER TUBE ASSEMBLY AND DRAIN TUBE ASSEMBLY BETWEEN CANISTER AND DRAIN FILTER.

Is the canister tube assembly and/or the drain tube assembly clogged between canister and drain filter-

Replace the canister tube assembly and/or the drain tube assembly between canister and drain filter. Canister Drain Filter

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P1449 EVAP SYSTEM CLOG DETECTED (AIR FILTER)

3.CHECK DRAIN FILTER.

Is the drain filter clogged-

Replace the drain filter. Drain Filter

Replace the canister. Canister

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)

ELCM

(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 starting the engine

≥ 20000 ms

• ELCM vacuum pump

Not in operation

• ELCM 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 ELCM pressure sensor output value as of 5 seconds ago and the current one, and if the value is greater than judgment value, detect and judge as filter clogging trouble.

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

Number of above conditions established

> 2 time(s)

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)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

1151.4 (8.636, 0.3)

2209.1 (16.57, 0.7)

Time Needed for Diagnosis: Approx. 5.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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