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Park/Neutral Position Switch Circuit

  1. Check starter operation. If starter operates with gear selector in any position except Park and Neutral, check starter circuit. See STARTERS article in STARTING & CHARGING SYSTEMS. If starter operates with gear selector in Park and Neutral only, go to next step.
  2. Check park/neutral position switch input signal circuit. See INPUT SIGNAL CIRCUITS . If input signal circuit is not okay, go to next step. If input signal circuit is okay, perform next procedure listed in SYMPTOM DIAGNOSIS  table under TROUBLE SHOOTING.
  3. Remove cruise control ECU, leaving electrical connector attached. Turn ignition on. Measure voltage (backprobe) between cruise control ECU connector terminal No. 3 and ground with gear selector in specified position. See Figure. With selector in Drive, voltage should be 10-14 volts. With selector in any other position than Drive, voltage should be less than one volt. If voltage is not as specified, go to next step. If voltage is as specified, perform next procedure listed in SYMPTOM DIAGNOSIS  table under TROUBLE SHOOTING.
  4. Check wiring and connectors between cruise control ECU and park/neutral position switch. Repair or replace as necessary. If wiring and connectors are okay, check cruise control ECU. See CRUISE CONTROL ECU PIN VOLTAGE TESTS  under COMPONENT TESTS. If cruise control ECU is defective, replace ECU.
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