LEMON Manuals: Even more car manuals for everyone
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 P1400 Fuel Tank Pressure Control Solenoid Valve Circuit Low >> Wiring Diagram

DTC P1400 Fuel Tank Pressure Control Solenoid Valve Circuit Low: Wiring Diagram

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.

Engine electrical system, turbo model < Refer to appropriate SYSTEM WIRING DIAGRAM. >

Fig 1: Pressure Control Solenoid Valve Circuit Low - Wiring Diagram
G08563726Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK OUTPUT SIGNAL OF ECM. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage between ECM and chassis ground.

    Connector & terminal 

    (B135) No. 3 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 2.  Go to step 3. 
2 CHECK FOR POOR CONTACT. 
Check for poor contact of ECM connector.		 Is there poor contact of ECM connector? Repair the poor contact of ECM connector. 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.
3 CHECK POWER SUPPLY TO PRESSURE CONTROL SOLENOID VALVE ASSEMBLY. 
Measure the voltage between the pressure control solenoid valve assembly and chassis ground.
Connector & terminal 
(R68) No. 1 (+) - Chassis ground (-): 		 Is the voltage 10 V or more? Go to step 4.  Repair the power supply circuit.
4 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE ASSEMBLY. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from the ECM and pressure control solenoid valve assembly.
  3. Measure the resistance between the pressure control solenoid valve assembly connector and chassis ground.

    Connector & terminal 

    (R68) No. 2 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 5.  Repair the harness between ECM and pressure control solenoid valve assembly connector for short-circuit to ground.
5 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE ASSEMBLY. 
Measure the resistance of harness between ECM and pressure control solenoid valve assembly connector.
Connector & terminal 
(B135) No. 3 - (R68) No. 2: 		 Is the resistance less than 1 Ω? Go to step 6.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit in the wiring harness between ECM and pressure control solenoid valve assembly connector
  • Poor contact of coupling connector
6 CHECK PRESSURE CONTROL SOLENOID VALVE ASSEMBLY. 
Measure the resistance between terminals of pressure control solenoid valve assembly.
Terminals 
No. 1 - No. 2: 		 Is the resistance 10 - 100 Ω? Repair the pressure control solenoid valve assembly connector for poor contact. Replace the pressure control solenoid valve assembly. < Refer to PRESSURE CONTROL SOLENOID VALVE ASSEMBLY . >
scientia non olet · About LEMON Manuals