P0103
DTC P0103 - MASS AIR FLOW SENSOR CIRCUIT HIGH INPUTDTC 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 and INSPECTION MODES. Clearing Diagnostic Trouble Codes
WIRING DIAGRAM:
10D1: CONNECT SUBARU SELECT MONITOR OR THE OBD-II GENERAL SCAN TOOL, AND READ DATA.
1) Turn Ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general scan tool to data link connector.
3) Turn ignition switch to ON and Subaru Select Monitor or the OBD-II general scan tool switch to ON.
4) Start engine.
5) Read data of mass air flow 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".
- OBD-II general scan tool. For detailed operation procedures, refer to the OBD-II General Scan Tool Procedures.
CHECK: Is the value equal to or more than 0 g/sec (0 lb/mm) or 0.3 V and equal to or less than 186 g/sec (25 lb/mm) or 5.0 V?
YES: Even if MIL lights up, the circuit has returned to a normal condition at this time.
NO: Go to step 10D2.
10D2: CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW SENSOR CONNECTOR.
1) Turn ignition switch to OFF and Subaru Select Monitor or the OBD-II general scan tool switch to OFF.
2) Disconnect connector from mass air flow sensor.
3) Turn ignition switch to ON and Subaru Select Monitor or the OBD-II general scan tool switch to ON.
4) Read data of mass air flow 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".
- OBD-II general scan tool. For detailed operation procedures, refer to the OBD-II General Scan Tool Procedures.
CHECK: Is the value more than 186 9/sec (25 lb/mm) or 5 V?
YES: Repair battery short circuit in harness between mass air flow sensor and ECM connector. After repair, replace ECM.
NO: Replace mass air flow sensor.