A/T
DTC P1121 - NEUTRAL POSITION SWITCH CIRCUIT LOW INPUTDTC DETECTING CONDITION:
- Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
- Erroneous idling
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
11BV1: CHECK DTC P0705 ON DISPLAY.
CHECK: Does the Subaru Select Monitor or OBD-II general scan tool indicate DTC P0705?
YES: Inspect DTC P0705 using "11. Diagnostics Chart with Trouble Code for AT Vehicles".
NO: Go to step 11BV2.
11BV2:CHECK INPUT SIGNAL FOR ECM.
1. Turn ignition switch to ON.
Connector & Terminal - [(B135) No.26 (+) - Chassis Ground (-)]:
2. Measure voltage between ECM and chassis ground.
CHECK: Is the voltage between 4.5 and 5.5 V at except "N" and "P" positions?
YES: Even if MIL lights up, the circuit has returned to a normal condition at this time.
NO: Go to step 11BV3.
11BV3: CHECK HARNESS BETWEEN ECM AND TRANSMISSION HARNESS CONNECTOR.
1. Turn ignition switch to OFF.
2. Disconnect connectors from ECM and transmission harness connector (T3).
Connector & Terminal - [(B135) No.26 - Chassis Ground]:
3. Measure resistance of harness between ECM connector and chassis ground.
CHECK: Is the resistance less than 10 Ohms?
YES: Repair ground short circuit in harness between ECM and transmission harness connector.
NO: Go to step 11BV4.
11BV4: CHECK TRANSMISSION HARNESS CONNECTOR.
1. Disconnect connector from inhibitor switch.
Connector & Terminal - [(T3) No.12 - Engine Ground]:
2. Measure resistance of harness between transmission harness connector and engine ground.
CHECK: Is the resistance less than 10 Ohms?
YES: Repair ground short circuit in harness between transmission harness and inhibitor switch connector.
NO: Go to step 11BV5.
11BV5: CHECK INHIBITOR SWITCH.
Terminals [No.7 - No.12]:
Measure resistance between inhibitor switch connector receptacle's terminals in selector lever except for "N" position.
CHECK: Is the resistance more than 1 M.Ohms at except "N" and "P" positions?
YES: Go to step 11BV6.
NO: Replace inhibitor switch.
11BV6: CHECK SELECTOR CABLE CONNECTION.
CHECK: Is there any fault in selector cable connection to inhibitor switch?
YES: Repair selector cable connection.
NO: Contact with Subaru of America (SOA) service.
NOTE: Inspection by Subaru of America's DTM is required, because probable cause is deterioration of multiple parts.