DTC P2122 Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
GENERAL DESCRIPTION < Ref. to , DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT LOW INPUT , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling
Poor driving performance

WIRING DIAGRAM:

Fig 1: Throttle/Pedal Position Sensor/Switch "D" Circuit Wiring Diagram (DTC P2122)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE - DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT

Step	Check	Yes	No
1 CHECK ACCELERATOR PEDAL POSITION SENSOR OUTPUT. Turn the ignition switch to ON. Read the data of main accelerator pedal position sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the generic scan tool instruction card, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . >	Is the voltage more than 0.4 V?	Go to step 2 .	Go to step 3 .
2 CHECK POOR CONTACT. Check poor contact in connector between ECM and accelerator pedal position sensor.	Is there poor contact?	Repair the poor contact.	Temporary poor contact occurred, but it is normal at present.
3 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from the accelerator pedal position sensor. Measure the resistance between ECM connector and accelerator pedal position sensor connector. Connector & terminal (B136) No. 17 - (B315) No. 5: (B136) No. 15 - (B315) No. 3:	Is the resistance less than 1 ?	Go to step 4.	Repair the open circuit of harness connector.
4 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B136) No. 17- Chassis ground: (B136) No. 15 - Chassis ground:	Is the resistance more than 1 M?	Go to step 5.	Repair the chassis short circuit of harness.
5 CHECK POWER SUPPLY OF ACCELERATOR PEDAL POSITION SENSOR. Connect the ECM connector. Turn the ignition switch to ON. Measure the voltage between accelerator pedal position sensor connector and engine ground. Connector & terminal (B315) No. 3 (+) - Engine ground (-):	Is the voltage 4.5 - 5.5 V?	Go to step 6.	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >
6 CHECK ACCELERATOR PEDAL POSITION SENSOR. Measure the resistance of accelerator pedal position sensor. Terminals No. 3 - No. 4:	Is the resistance 1.2 - 4.8 k?	Go to step 7.	Replace the accelerator pedal position sensor.
7 CHECK ACCELERATOR PEDAL POSITION SENSOR. Measure the resistance of accelerator pedal position sensor. Terminals No. 5 - No. 4: Check the measured value is within the specification without depressing the accelerator pedal.	Is the resistance 0.2 - 1.0 k?	Go to step 8.	Replace the accelerator pedal position sensor.
8 CHECK ACCELERATOR PEDAL POSITION SENSOR. Measure the resistance of accelerator pedal position sensor. Terminals No. 5 - No. 4: Check the measured value is within the specification with the accelerator pedal depressed.	Is the resistance 0.5 - 2.5 k?	Repair the poor contact in ECM connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Replace the accelerator pedal position sensor.