M/T

DTC P0121 - THROTTLE POSITION SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (HIGH INPUT)

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

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

10J1: CHECK ANY OTHER DTC ON DISPLAY.

CHECK: Does the Subaru Select Monitor or OBD-II general scan tool indicate DTC P0107; P0108, P0122 or P0123?

YES: Inspect DTC P0107, P0108, P0122 or P0123 using "10. Diagnostics Chart with Trouble Code for MT Vehicles".

NOTE: In this case, it is not necessary to inspect DTC P0121.

NO: Go to step 10J2.

10J2: CHECK CURRENT DATA.

1. Start engine.
2. Read the data of intake manifold absolute pressure 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 53.3 kPa (400 mmHg, 15.75 inHg)?

YES: Replace intake manifold pressure sensor.

NO: Replace throttle position sensor.