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Park/Neutral Position Switch Circuit

  1. Ensure starting system is operating normally. Check for starting system problems and repair as necessary. See STARTERS article in STARTING & CHARGING SYSTEMS. If starting system is okay, go to next step.
  2. Perform park/neutral position switch test. See CANCEL SWITCHES  test in CRUISE CONTROL FUNCTION TEST under TROUBLE SHOOTING. If park/neutral position switch input signal is not as specified, go to next step. If park/neutral position switch input signal is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed.
  3. Remove cruise control ECU with connector attached. See Figure. Turn ignition switch to ON position. Backprobing connector, measure voltage between ground and terminal No. 3 (Blue/Black wire) at cruise control ECU connector. With shift lever in Drive, battery voltage should be present. With shift lever in any other position, voltage should be less than one volt. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed.
  4. Check wiring harness and connectors between cruise control ECU and park/neutral position switch. Repair as necessary. If wiring harness and connectors are okay, replace cruise control ECU and retest system.
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