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P0121
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
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 2200 cc Models".
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.