DTC P1400 Fuel Tank Pressure Control Solenoid Valve Circuit Low: Wiring Diagram
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK OUTPUT SIGNAL OF ECM.
|
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 THE PRESSURE CONTROL SOLENOID VALVE. Measure the voltage between pressure control solenoid valve 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.
|
Is the resistance 1 MΩ or more? | Go to step 5 . | Repair the ground short circuit of harness between ECM and pressure control solenoid valve connector. |
| 5 CHECK HARNESS BETWEEN ECM AND PRESSURE CONTROL SOLENOID VALVE. Measure the resistance of harness between ECM and pressure control solenoid valve 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:
|
| 6 CHECK PRESSURE CONTROL SOLENOID VALVE. Measure the resistance between pressure control solenoid valve terminals. Terminals No. 1 - No. 2: |
Is the resistance 10 - 100 Ω? | Repair the poor contact of pressure control solenoid valve connector. | Replace the pressure control solenoid valve. < Refer to PRESSURE CONTROL SOLENOID VALVE . > |