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Subaru Legacy Service Manual: Dtc p2404 evap system leak detection pump sense circuit range/performance

Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2404 evap system leak detection pump sense circuit range/performance

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.

WIRING DIAGRAM:

Engine Electrical System ENGINE TYPE FB (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

Engine Electrical System ENGINE TYPE FB (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

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 P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

2.CHECK ELCM PUMP.

Operate the ELCM pump using the Subaru Select Monitor.

NOTE:

For detailed operation procedures, refer to the “Active Test”. Active Test

Does the ELCM pump operate-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

3.CHECK POWER SUPPLY OF LEAK CHECK VALVE ASSEMBLY.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the leak check valve assembly.

3) Turn the ignition switch to ON.

4) Measure the voltage between the leak check valve assembly connector and chassis ground.

Connector & terminal

(R400) No. 3 (+) — Chassis ground (−):

Is the voltage 10 V or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between the main relay and the leak check valve assembly connector

Poor contact of main relay connector

Poor contact of coupling connector

4.CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance of harness between ECM connector and the leak check valve assembly connector.

Connector & terminal

(B134) No. 9 — (R400) No. 4:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between ECM connector and the leak check valve assembly connector

Poor contact of coupling connector

5.CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR.

1) Measure the resistance of harness between ECM connector and chassis ground.

Connector & terminal

(B134) No. 9 — Chassis ground:

Is the resistance 1 M- or more-

Replace the leak check valve assembly. Leak Check Valve Assembly

Repair the short circuit to ground in harness between ECM connector and leak check valve assembly connector.

6.CHECK ELCM SWITCHING VALVE.

Operate the ELCM switching valve using the Subaru Select Monitor.

NOTE:

For detailed operation procedures, refer to the “Active Test”. Active Test

Does the ELCM switching valve operate-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

7.CHECK POWER SUPPLY OF LEAK CHECK VALVE ASSEMBLY.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the leak check valve assembly.

3) Turn the ignition switch to ON.

4) Measure the voltage between the leak check valve assembly connector and chassis ground.

Connector & terminal

(R400) No. 5 (+) — Chassis ground (−):

Is the voltage 10 V or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between the main relay and the leak check valve assembly connector

Poor contact of main relay connector

Poor contact of coupling connector

8.CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance of harness between ECM connector and the leak check valve assembly connector.

Connector & terminal

(B134) No. 61 — (R400) No. 1:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2404 EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit in harness between ECM connector and the leak check valve assembly connector

Poor contact of coupling connector

9.CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR.

1) Measure the resistance of harness between ECM connector and chassis ground.

Connector & terminal

(B134) No. 61 — Chassis ground:

Is the resistance 1 M- or more-

Replace the leak check valve assembly. Leak Check Valve Assembly

Repair the short circuit to ground in harness between ECM connector and leak check valve assembly connector.

10.CHECK EVAPORATIVE EMISSION CONTROL SYSTEM.

Perform drive cycle I. Drive Cycle > PROCEDURE

Is DTC P2404 displayed on the display-

Replace the leak check valve assembly. Leak Check Valve Assembly

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.

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)

Dtc p2419 evap system switching valve control circuit low
DTC DETECTING CONDITION:Immediately at fault recognitionCAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mod ...

Dtc p2402 evap system leak detection pump control circuit high
DTC DETECTING CONDITION:Immediately at fault recognitionCAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mod ...

Other materials:

Inspection
1. CLUTCH DISC1. Facing wearMeasure the depth from the facing surface to the rivet head. Replace if the face is worn locally or worn down to less than the specified value.Depth to rivet head:Limit of sinking0.8 mm (0.031 in)NOTE:Do not wash the clutch disc with any type of cleaning fluid.2. Hardened ...

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