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Home >> Jeep >> 2000 >> Cherokee Limited, 2D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Engine Sensors & Switches >> Checking Throttle Position Sensor Calibration >> Cherokee & Wrangler
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Cherokee & Wrangler

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2  under VERIFICATION TESTS to ensure system is functioning properly.
  1. Turn ignition on, with engine off. Using scan tool, monitor Throttle Position (TP) sensor voltage while wiggling TP sensor connector and wiring harness. TP sensor is located on throttle body. See Figure or Figure . If voltage does not change while wiggling connector and wiring harness, go to next step. If voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused voltage to change.
  2. Ensure ignition is on, with engine off. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TP sensor voltage with throttle fully closed. If voltage is less than .92 volt, go to next step. If voltage is .92 volt or more, replace TP sensor.
  3. Using scan tool, monitor TP sensor voltage while slowly moving throttle from closed position to fully open position. If voltage changes smoothly, go to next step. If voltage does not change smoothly, replace TP sensor.
  4. Start engine and allow it to idle. Using scan tool, monitor engine speed (RPM) while wiggling TP sensor connector and wiring harness. If RPM changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused RPM to change. If RPM does not change while wiggling connector and wiring harness, go to next step.
  5. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Test is complete.
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