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Test NTC-20A: Checking Park/Neutral Position Switch

NOTE: Perform TEST NTC-1A: NO TROUBLE CODES (NTC) TESTS  before proceeding.
NOTE: Vehicles are equipped with a Transmission Range Sensor (TRS). TRS may be referred to as park/neutral switch during test procedure.
  1. Using scan tool, read park/neutral switch input state. Observe scan tool display while moving gear selector through all gear positions. If scan tool displayed P/N and D/R, park/neutral switch is okay. Test passed. If scan tool did not display P/N and D/R, go to next step.
  2. Put gear selector in Park. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance between PCM connector terminal No. 76 and ground while moving gear selector through all gear positions. See PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance switched from less than 5 ohms to more than 5 ohms, replace PCM. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance did not switch from less than 5 ohms to more than 5 ohms, go to next step.
  3. If resistance did not stay less than 5 ohms all the time, go to next step. If resistance stayed less than 5 ohms all the time, disconnect 10-pin Transmission Range Sensor (TRS) connector. If resistance is still less than 5 ohms, repair short to ground on park/neutral switch sense circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is not less than 5 ohms, replace park/neutral switch. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  4. Disconnect 10-pin TRS connector. Using an ohmmeter, check resistance of park/neutral switch sense circuit between 10-pin TRS connector and PCM connector terminal No. 76. See PCM CONNECTOR WIRE IDENTIFICATION  table and TRS CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, replace transmission range sensor. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, repair open park/neutral switch sense circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 76
Park/Neutral Switch Sense Circuit Black/Pink
TRS CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Park/Neutral Switch Sense Circuit Black/White
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