DTC P1101 (N_SWOFF): NEUTRAL POSITION SWITCH CIRCUIT MALFUNCTION (A/T) Subaru Forester SF

1. Connect scan tool. Retrieve DTC(s). If DTC P0705 exists, diagnose that DTC first. If DTC P1101 is only code set, go to next step.
2. Turn ignition on. Using voltmeter connected to ground, backprobe PCM connector terminal No. 82 (White/Black wire). Observe voltage reading while placing transmission in Park, and then Neutral. Leave voltmeter connected. If voltage reading is one volt or less, go to next step. If voltage reading is more than one volt, go to step 4).
3. Move transmission shifter to any gear other than Park or Neutral. If voltage reading is not 4.5-5.5 volts, leave voltmeter connected and go to next step. If voltage reading is 4.5-5.5 volts, check for poor terminal contact in PCM connector. If connection is okay, replace PCM.
4. If voltage reading is more than 10 volts, repair short to power in harness between PCM and inhibitor switch. If voltage reading is 10 volts or less, turn ignition off and go to next step.
5. Disconnect PCM and inhibitor switch connectors. Using an ohmmeter, check resistance of harness between PCM connector terminal No. 82 (White/Black wire) and inhibitor switch connector terminal No. 2 (Black/White wire). If resistance is one ohm or less, go to step 7). If resistance is more than one ohm, go to next step.
6. Check for poor contact at PCM or inhibitor switch connectors. If connections are okay, check for an open in harness between PCM and inhibitor switch connectors.
7. Check resistance between ground and inhibitor switch connector terminal No. 1 (Black/Yellow wire). If resistance is more than 5 ohms, repair open in inhibitor switch ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article in this section. If resistance is 5 ohms or less, go to next step.
8. Check resistance of inhibitor switch between terminals No. 1 and 2. (Scheme 14) If resistance is one ohm or less in Neutral and Park, go to next step. If resistance is more than one ohm, replace inhibitor switch.
9. Check selector cable connection to inhibitor switch. Repair as needed. If no problem is found, replace PCM.

Scheme 14