DTC P0222: Throttle/Pedal Position Sensor/Switch "B" Circuit Low: Notes

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 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 P0222 displayed? (Current code)

   Yes:  Go to  4.

   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.

4. CHECK FOR POOR CONTACT  .
   1. Turn the ignition switch to OFF.
   2. Check for poor contact of ECM and electronic throttle control connector.

   Is there poor contact in ECM or electronic throttle control connector?

   Yes:  Repair the poor contact of ECM or electronic throttle control connector.

   No:  Go to  5.

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

      Connector & terminal 

      (E52) No. 22 - (E116) No. 2:

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

   Is the resistance less than 1 Ω?

   Yes:  Go to  6.

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

6. CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR (SHORT TO GROUND)  .

   Measure the resistance between the ECM connector and engine ground.

   Connector & terminal 

   (E52) No. 22 - Engine ground:

   (E52) No. 15 - Engine ground:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  7.

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

7. CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL  .
   1. Connect the connector to ECM.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between electronic throttle control connector and engine ground.

      Connector & terminal 

      (E116) No. 2 - Engine ground:

   Is the voltage 4.5 - 5.5 V?

   Yes:  Replace the electronic throttle control. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>THROTTLE BODY .

   No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM) .