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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls (Diagnostics) (H4DOTC)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P04AD EVAP System Purge Control Valve "B" Circuit High >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE 2 CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from ECM and purge control solenoid valve 2.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between ECM and chassis ground.

    Connector & terminal 

    (B137) No. 15 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Repair the short to power in the harness between ECM and purge control solenoid valve 2 connector. Go to step 2. 
2 CHECK PURGE CONTROL SOLENOID VALVE 2. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between purge control solenoid valve 2 terminals.

    Terminals 

    No. 1 - No. 2: 

 Is the resistance less than 1 Ω? Replace the purge control solenoid valve 2. < Refer to PURGE CONTROL SOLENOID VALVE . > Repair the poor contact of ECM connector.
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