A/T

DTC P0123 - THROTTLE POSITION SENSOR CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:
- Immediately at fault recognition

TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.
- Poor driving performance

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.

Wiring Diagram:

WIRING DIAGRAM

11L1: CHECK CURRENT DATA.

1. Start engine.
2. Read data of throttle position sensor signal using Subaru Select Monitor or OBD-II general scan tool.

NOTE:
- Subaru Select Monitor
For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE". Refer to Normal Scan Data Values.
- OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the value more than 4.9 V?

YES: Go to step 11L2.

NO: Even if MIL lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector may be the cause.

NOTE: In this case, repair the following:
- Poor contact in throttle position sensor connector
- Poor contact in ECM connector
- Poor contact in coupling connector (B21)

11L2: CHECK HARNESS BETWEEN THROTTLE POSITION SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to OFF
2. Disconnect connector from throttle position sensor.

Connector & Terminal - [(E13) No.2 - Engine Ground]:

3. Measure resistance of harness between throttle position sensor connector and engine ground.

CHECK: Is the resistance less than 5 Ohms?

YES: Go to step 11L3.

NO: Repair harness and connector.

NOTE: In this case, repair the following:
- Open circuit in harness between throttle position sensor and ECM connector
- Poor contact in coupling connector (B21)
- Poor contact in joint connector (B83)

11L3: CHECK HARNESS BETWEEN THROTTLE POSITION SENSOR AND ECM CONNECTOR.

1. Turn ignition switch to ON.

Connector & Terminal - [(E13) No.3 (+) - Engine Ground (-)]:

2. Measure voltage between throttle position sensor connector and engine ground.

CHECK: Is the voltage more than 4.9 V?

YES: Repair battery short circuit in harness between throttle position sensor and ECM connector. After repair, replace ECM.

NO: Replace throttle position sensor.