M/T
DTC P1121 - NEUTRAL POSITION SWITCH CIRCUIT HIGH 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
10BX1: 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 more than 10 V in neutral position?
YES: Go to step 10BX2.
NO: Go to step 10BX4.
10BX2: CHECK INPUT SIGNAL FOR ECM
Connector & Terminal - [(B135) No.26 (+) - Chassis ground (-)]:
Measure voltage between ECM and chassis ground
CHECK: Is the voltage less than 1 V in other positions?
YES: Go to step 10BX3.
NO: Go to step 10BX4.
10BX3: CHECK POOR CONTACT.
Check poor contact in ECM connector.
CHECK: Is there poor contact in ECM connector?
YES: Repair poor contact in ECM connector.
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.
10BX4: CHECK NEUTRAL POSITION SWITCH.
Connector & Terminal - [(T2) No.1 - No.2]:
Measure resistance between transmission harness connector terminals.
CHECK: Is the resistance less than 1 Ohm in other positions?
YES: Go to step 10BX5.
NO: Repair open circuit in transmission harness or replace neutral position switch.
10BX5: CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR.
1. Disconnect connector from ECM.
Connector & Terminal - [(B135) No.26 - (B25) No.1]:
2. Measure resistance of harness between ECM and transmission harness connector.
CHECK: Is the resistance less than 1 Ohm?
YES: Go to step 10BX6.
NO: Repair open circuit in harness between ECM and transmission harness connector.
10BX6: CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH CONNECTOR.
Connector & Terminal - [(B25) No.2 - Engine Ground]:
Measure resistance of harness between transmission harness connector and engine ground.
CHECK: Is the resistance less than 5 Ohms?
YES: Go to step 10BX7.
NO: Repair harness and connector.
NOTE: In this case, repair the following:
- Open circuit in harness between transmission harness connector and engine grounding terminal
- Poor contact in coupling connector (B22)
10BX7: CHECK POOR CONTACT
Check poor contact in transmission harness connector.
CHECK: Is there poor contact in transmission harness connector?
YES: Repair poor contact in transmission harness connector.
NO: Contact with Subaru of America (SOA) service.
NOTE: Inspection by Subaru of America's DTM is required, because probable deterioration of multiple parts.