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

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-5  under VERIFICATION TESTS to ensure system is functioning properly.
  1. Using scan tool, monitor Throttle Position (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.
  2. Start engine and allow it to idle. Using scan tool, monitor engine speed (RPM) while wiggling TP sensor connector and wiring harness. TP sensor is located on throttle body. See Figure or Figure . 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, turn ignition off and go to next step.
  3. Turn ignition on, with engine off. Using scan tool, monitor TP sensor voltage while wiggling TP sensor connector and wiring harness. 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.
  4. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, go to next step.
  5. Turn ignition 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, no problem is indicated at this time. Test is complete. If voltage is .92 volt or more, replace TP sensor.
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