DTC P0122 Throttle/Pedal Position Sensor/Switch "A" Circuit Low: Wiring Diagram

Engine Electrical System ENGINE TYPE FA (WITHOUT PUSH BUTTON START) <Ref. to 2.0L TURBO (WITHOUT PUSH BUTTON START), WIRING DIAGRAM, Engine Electrical System.>
Engine Electrical System ENGINE TYPE FA (WITH PUSH BUTTON START) <Ref. to 2.0L TURBO (WITH PUSH BUTTON START), WIRING DIAGRAM, Engine Electrical System.>

Fig 1: Throttle/Pedal Position Sensor/Switch A Circuit Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and electronic throttle control. Measure the resistance between the ECM connector and engine ground. Connector & terminal E-150 No. 18 - Engine ground: E-150 No. 17 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 2 .	Repair the ground short circuit of harness between ECM connector and electronic throttle control connector.
2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between electronic throttle control connector and engine ground. Connector & terminal E150 No. 1 - Engine ground:	Is the resistance 1 MΩ or more?	Replace the electronic throttle control. <Ref. to THROTTLE BODY .>	Repair the ground short circuit of harness between ECM connector and electronic throttle control connector. Replace the ECM if defective. <Ref. to ENGINE CONTROL MODULE (ECM) .>