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Code 51 - Neutral Position Signal

NOTE: For ECM harness connector terminal identification, see Figure.
  1. Turn ignition on. Using a DVOM, check voltage between ECM harness connector terminal B10 (backprobe) and ground. With shifter in Neutral, voltage should be zero.
  2. Check voltage at terminal B10 with shifter in all other positions. Voltage should be 8 volts or greater. If voltage is not as specified, go to next step. If voltage is as specified, check ECM harness connector terminals for good contact. Repair as necessary. If harness connector terminals are okay, replace ECM.
  3. Turn ignition off. Disconnect neutral switch harness connector located near transaxle dipstick. Using an ohmmeter, check resistance between neutral switch harness connector terminal No. 1 (Light Green/Yellow wire) and ground. With shifter in Neutral, resistance should be zero ohms.
  4. Check resistance at terminal No. 1 with vehicle in all other shift positions. Resistance should be one megohm or greater. If resistances are not as specified, replace neutral switch. If resistances are as specified, repair circuit between ECM and neutral switch as necessary.
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