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Test TC-114A - Park/Neutral Switch Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Vehicle is equipped with a transmission range sensor.
  1. Using scan tool, read park/neutral switch input state. Observe scan tool display while moving gear selector in and out of Park and Reverse. If scan tool displayed P/N and D/R, go to next step. If scan tool did not display P/N and D/R, go to step 4).
  2. Condition to set trouble code is not present at this time. PARK/NEUTRAL SWITCH FAILURE DTC sets when transmission is in Park or Neutral with engine cranking. If transmission is in drive, vehicle speed must be more than 50 MPH, engine speed must be 1985-4480 RPM, Throttle Position (TP) sensor must not be closed and Manifold Absolute Pressure (MAP) sensor must be more than 66 percent. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A. If related wiring and connectors were repaired, perform TEST VER-2A.
  4. Turn ignition off. Put gear selector in Park. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, connect ohmmeter lead to Park/Neutral switch sense circuit at PCM connector terminal No. 76. See PCM TERMINAL 76 CONNECTOR WIRE  IDENTIFICATION table. Observing scan tool resistance reading, move gear selector in and out of Park and Reverse. If resistance switched from less than 5 ohms to more than 5 ohms, replace PCM. Perform TEST VER-2A. If resistance did not switch from less than 5 ohms to more than 5 ohms, go to next step.
  5. If resistance stayed less than 5 ohms all the time, repair short to ground on Park/Neutral switch sense circuit. Perform TEST VER-2A. If resistance did not stay less than 5 ohms all the time, go to next step.
  6. Disconnect transmission range sensor connector. Using an external ohmmeter, check resistance of park/neutral switch sense circuit between 10-pin transmission range sensor connector and PCM connector terminal No. 76. See PCM TERMINAL 76 CONNECTOR WIRE  IDENTIFICATION table for wire color identification on PCM connector and 10-pin transmission range sensor connector. If resistance is less than 5 ohms, replace transmission range sensor. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open park/neutral switch sense circuit. Perform TEST VER-2A.
PCM TERMINAL 76 CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 76 (Park/Neutral Switch Sense Circuit) Black/Yellow
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