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Test NTC-15: Checking Throttle Position Sensor Operation

  1. Turn ignition on with engine off. Using scan tool, monitor TP sensor voltage while slowly moving throttle from closed position to fully open position. If TP sensor voltage changes smoothly, TP sensor is operating properly. Test is complete. If TP sensor voltage does not change smoothly, replace TP sensor. Perform TEST VER-5A .
  2. Ensure ignition is off. Check throttle cable, cruise control cable (if equipped) and throttle valve on throttle body for binding. If no binding exists, go to next step. If binding exists, repair or replace components as necessary. Perform TEST VER-2A .
  3. Start engine and allow to idle. Wiggle wiring harness and connectors from TP sensor to PCM while monitoring engine RPM. If RPM changes, repair harness or connector as necessary. Perform TEST VER-5A . If RPM did not change, go to next step.
  4. Turn ignition on with engine off. Using scan tool, monitor TP sensor voltage. Wiggle wiring harness and connectors from TP sensor to PCM while monitoring voltage. If voltage changes, repair wiring or connectors as necessary. Perform TEST VER-5A . If voltage does not change, go to next step.
  5. Inspect wiring and connectors between PCM and TP sensor. If any problems are found, repair as necessary. Perform TEST VER-5A . If no problems are found, go to next step.
  6. Ensure ignition is on. Using scan tool, read TP sensor voltage with throttle fully closed. If TP sensor voltage is .92 volt or less, test is complete. If TP sensor voltage is more than .92 volt, replace TP sensor. Perform TEST VER-5A .
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