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DTC P1101: Neutral Position Switch Circuit High Input (A/T)

  1. Turn ignition off. Connect scan tool. Turn ignition on and read DTCs. If DTC P0705 exists, diagnose that DTC first. Using voltmeter connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 26. See Figure. Observe voltage while placing transaxle in Neutral or Park. If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  4.
  2. Move transaxle shifter to any gear other than Neutral or Park. Using voltmeter connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 26. If voltage is between 4.5 and 5.5 volts, go to next step. If voltage is not between 4.5 and 5.5 volts, go to step  4.
  3. Check for poor contact in ECM connector B135 (28-pin connector). Repair as necessary. If connector is okay, replace ECM.
  4. Using a voltmeter connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 26. If voltage is more than 10 volts, repair short circuit between ECM and inhibitor switch connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage is not more than 10 volts, go to next step.
  5. Turn ignition off. Disconnect ECM connector B135 (28-pin connector) and inhibitor switch connector. Using an ohmmeter, measure resistance between ECM connector B135 (28-pin connector) terminal No. 26 and 12-pin inhibitor switch connector terminal No. 12. See Figure and Fig 1 . If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair open in harness between ECM connector B135 (28-pin connector), transaxle harness connector and inhibitor switch connector.
    Fig 1: Inhibitor Switch Harness Connector Terminal Identification
    G00013024Courtesy of SUBARU OF AMERICA, INC.
  6. Using an ohmmeter connected to ground, measure resistance of 12-pin inhibitor switch connector terminal No. 7. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair open circuit between inhibitor switch and starter motor and check for poor contact in starter circuit.
  7. Using an ohmmeter, measure resistance between 12-pin inhibitor switch terminals No. 7 and 12. See Fig 2. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, replace inhibitor switch.
  8. Check for fault in selector cable connection to inhibitor switch. Repair as necessary and retest. If no faults are found, replace ECM.
    Fig 2: Inhibitor Switch Terminal Identification
    G00013025Courtesy of SUBARU OF AMERICA, INC.
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