DTC P0223: Throttle/Pedal Position Sensor/Switch "B" Circuit High: Notes

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance
• Engine stall

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

   Is DTC P06B4 displayed? (Current code)

   Yes  : Check for DTC P06B4. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P06B4 SENSOR POWER SUPPLY "B" CIRCUIT LOW 

   No  : Go to  2.

2. CHECK DTC  .

   Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

   Is DTC P06B5 displayed? (Current code)

   Yes  : Check for DTC P06B5. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P06B5 SENSOR POWER SUPPLY "B" CIRCUIT HIGH 

   No  : Go to  3.

3. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR (OPEN)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Disconnect the connectors from electronic throttle control.
   4. Measure the resistance of harness between ECM connector and electronic throttle control connector.

      Connector & terminal 

      (E52) No. 23 - (E116) No. 3:

      (E52) No. 15 - (E116) No. 4:

   Is the resistance less than 1 Ω?

   Yes  : Go to  4.

   No  : Repair the open circuit of harness between ECM connector and electronic throttle control connector.

4. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR (OPEN)  .
   1. Connect the connector to ECM.
   2. Measure the resistance between electronic throttle control connector and engine ground.

      Connector & terminal 

      (E116) No. 3 - Engine ground:

   Is the resistance less than 5 Ω?

   Yes  : Go to  5.

   No  : Repair the following item.

   • Open circuit of harness between ECM connector and engine ground
   • Poor contact of ECM connector
5. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR (SHORT TO POWER SUPPLY)  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between electronic throttle control connector and engine ground.

      Connector & terminal 

      (E116) No. 4 (+) - Engine ground (-):

   Is the voltage 5 V or more?

   Yes  : Repair the short circuit to power supply in the harness between ECM connector and electronic throttle control connector.

   No  : Go to  6.

6. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR (SHORT BETWEEN LINES)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Measure the resistance between ECM connectors.

      Connector & terminal 

      (E52) No. 22 - (E52) No. 15:

   Is the resistance 1 MΩ or more?

   Yes  : Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>THROTTLE BODY

   No  : Repair the line-to-line short circuit between ECM connector and electronic throttle control connector.