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DTC P1101: Neutral Position Switch Circuit Low Input (M/T)

  1. Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 26. See Figure. Observe voltage while placing transaxle in Neutral. If voltage is more than 10 volts, go to next step. If voltage is not more than 10 volts, go to step  4.
  2. Move transaxle shifter to any gear other than Neutral. Using voltmeter connected to ground, backprobe ECM connector B135 (28-pin connector) terminal No. 26. If voltage is less than one volt, go to next step. If voltage is more than one volt, 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. Turn ignition off. Disconnect in-line 2-pin inhibitor switch connector in transaxle harness between transaxle and ECM. Using an ohmmeter, measure resistance across both terminals of transaxle-side of connector. If resistance is more than 1 megohm, go to next step. If resistance is not more than one megohm, check for short in transaxle harness between connector and transaxle. See appropriate wiring diagram in WIRING DIAGRAMS article. If no short is present, replace neutral position switch.
  5. Measure resistance between ground and ECM connector B135 (28-pin connector) terminal No. 26. If resistance is 10 ohms or greater, go to next step. If resistance is less than 10 ohms, repair short in harness between ECM connector B135 (28-pin connector) and transaxle harness connector.
  6. Check for poor contact in transaxle harness connector. Repair connector as necessary. If connector is okay, replace ECM.
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