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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using scan tool, check for PCM DTCs. If PCM DTCs P0121, P0122 or P0123 are set, diagnose and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no PCM DTCs are set, go to next step.
  2. Start engine and allow it to idle. Using scan tool, check TP sensor voltage. If TP sensor voltage is less than .3 volt or greater than one volt, go to next step. If TP sensor voltage is not as specified, go to step  6.
  3. Turn ignition off. Disconnect PCM harness connector C3 and TP sensor harness connector. Measure resistance of TP sensor ground circuit between TP sensor harness connector terminal No. 3 and PCM harness connector C3 terminal No. 17 using Miller Special Tool (8815). See WIRING DIAGRAMS . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open circuit.
  4. Disconnect PCM harness connector C2. See Figure. Measure resistance of TP sensor signal circuit between TP sensor harness connector terminal No. 2 and PCM harness connector C2 terminal No. 21 using Miller Special Tool (8815). See WIRING DIAGRAMS . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open circuit.
  5. If no other potential causes for DTC P0120 remain, PCM is assumed to be faulty. Repair or replace as necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
  6. Turn ignition on. Using scan tool, monitor TP sensor voltage while slowly opening and closing throttle. If voltage change is smooth, go to next step. If voltage change is not smooth, replace TP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
  7. Conditions necessary to set DTC are not present at this time. Using wiring diagram as a guide, inspect wiring and connectors associated with circuits in question. See WIRING DIAGRAMS . Wiggle wires while checking for shorted and open circuits. Pay particular attention to condition of TP sensor circuits at point where they are spliced to engine circuits. Repair as necessary. If circuits are okay, testing is complete.
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