DTC P2123 Throttle/Pedal Position Sensor/Switch "D" Circuit High Input: Wiring Diagram

Fig 1: Throttle/Pedal Position Sensor/Switch "D" Circuit High Input - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and accelerator pedal position sensor. Measure the resistance of harness between ECM and accelerator pedal position sensor connector. Connector & terminal (B135) No. 23 - (B315) No. 6: (B135) No. 29 - (B315) No. 5:	Is the resistance less than 1 Ω?	Go to step 2.	Repair the open circuit in harness between ECM and accelerator pedal position sensor connector.
2 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Connect the ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector & terminal (B315) No. 5 - Chassis ground:	Is the resistance less than 5 Ω?	Go to step 3.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit of harness between ECM and engine ground Poor contact in ECM connector Poor contact of coupling connector
3 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to ON. Measure the voltage between accelerator pedal position sensor connector and chassis ground. Connector & terminal (B315) No. 6 (+) - Chassis ground (-):	Is the voltage 4.85 V or more?	Repair the short circuit of harness to power supply between ECM and accelerator pedal position sensor connector.	Go to step 4.
4 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM. Measure the resistance between ECM connectors. Connector & terminal (B135) No. 21 - (B135) No. 23:	Is the resistance 1 MΩ or more?	Repair the poor contact of accelerator pedal position sensor connector. Replace the accelerator pedal if defective. Refer to ACCELERATOR PEDAL .	Repair the short circuit of harness to power supply between ECM and accelerator pedal position sensor connector.