DTC P2419: EVAP System Switching Valve Control Circuit Low: Notes

-
DTC detecting condition:

Immediately at fault recognition

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR .
1. Turn the ignition switch to ON.
2. Measure the voltage between ECM connector and engine ground.
  Connector & terminal
  
  (B134) No. 11 (+) - Engine ground (-):
  
  Is the voltage 10 V or more?
  
  Yes
  
  Go to 2 .
  
  No
  
  Go to 3 .
CHECK FOR POOR CONTACT .
Check for poor contact of ECM connector.

Is there poor contact of ECM connector?

Yes

Repair the poor contact of ECM connector.

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 again.

NOTE: In this case, temporary open or short circuit of harness or temporary poor contact of connector may be the cause.
CHECK POWER SUPPLY OF LEAK CHECK VALVE ASSEMBLY .
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?

Yes

Go to 4 .

No

Repair the following item.
- Open circuit in harness between M/B and the leak check valve assembly connector
- Poor contact of coupling connector
CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR (SHORT TO GROUND) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from the leak check valve assembly.
4. Measure the resistance between leak check valve assembly and chassis ground.
  Connector & terminal
  
  (R400) No. 1 - Chassis ground:
  
  Is the resistance 1 MΩ or more?
  
  Yes
  
  Go to 5 .
  
  No
  
  Repair the short circuit to ground in harness between ECM connector and leak check valve assembly connector.
CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY (OPEN) .
Measure the resistance of harness between ECM connector and the leak check valve assembly connector.

Connector & terminal

(B134) No. 11 - (R400) No. 1:

Is the resistance less than 1 Ω?

Yes

Go to 6 .

No

Repair the following item.
- Open circuit in harness between ECM connector and the leak check valve assembly connector
- Poor contact of coupling connector
CHECK LEAK CHECK VALVE ASSEMBLY .
Check the switching valve of the leak check valve assembly. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>LEAK CHECK VALVE ASSEMBLY>INSPECTION>CHECK SWITCHING VALVE .

Is the check result OK?

Yes

Repair the poor contact in the leak check valve assembly connector.

No

Replace the leak check valve assembly. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>LEAK CHECK VALVE ASSEMBLY .