LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 2003 >> Intrepid SXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0123: Throttle Position Sensor #1 High >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0123: Throttle Position Sensor #1 High: Testing

NOTE: Before proceeding, ensure throttle is fully closed and free from binding or carbon build-up.
  1. Start the engine. With the DRBIII® scan tool, read the TP sensor voltage. Is the voltage above 4.5 volts? If yes, go to next step. If no, go to step  8.
  2. Turn ignition off. Disconnect TP sensor harness connector. Disconnect PCM harness connector. Measure the resistance between the (K22) TP signal circuit and the (K6) 5-volt supply circuit in the TP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K22) TP signal circuit for a short to the (K6) 5-volt supply circuit. If no, go to next step.
  3. Turn the ignition off. Disconnect the TP sensor harness connector. Reconnect the PCM harness connectors. Ignition on, engine not running. Measure voltage between ground and the (K22) TP signal circuit in the TP sensor harness connector. Is the voltage above 5.2 volts? If yes, repair short to voltage in the (K22) TP signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the TP sensor harness connector. Connect a jumper wire between the (K22) TP signal circuit and the (K4) sensor ground circuit. With the DRBIII® scan tool, monitor the TP sensor voltage. Ignition on, engine not running. Is the voltage below 0.5 volt? If yes, replace the TP sensor. If no, go to next step.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K22) TP signal circuit from the TP harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K22) TP signal circuit for an open.
    6. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the TP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K4) sensor ground circuit for an open.
  7. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
  8. Ignition on, engine not running. With the DRBIII® scan tool, monitor TP sensor voltage. Slowly open the throttle from the idle position to the wide open throttle position. Does voltage start at approximately 0.7 of a volt and go above 3.5 volts with a smooth transition? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, replace TP sensor.
scientia non olet · About LEMON Manuals