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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0123: Throttle Position Sensor #1 High >> Testing

DTC P0123: Throttle Position Sensor #1 High: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before proceeding, ensure throttle is fully closed and free from binding or carbon build-up. Diagnose any IAC codes before continuing.
  1. Start the engine. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. 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 the ignition off. Disconnect the TP sensor harness connector. Connect a jumper wire between the (K22) TP sensor No. 1 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.
    NOTE: Remove the jumper wire before continuing.
  3. Turn the ignition off. Disconnect PCM harness connectors. Ignition on, engine not running. Measure voltage between ground and the (K22) TP sensor No. 1 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 sensor No. 1 signal circuit. If no, go to next step.
    4. 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.
  4. Turn the ignition off. Measure the resistance of the (K22) TP sensor No. 1 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 sensor No. 1 signal circuit for an open.
  5. Measure the resistance between the (K22) TP sensor No. 1 signal circuit and the (K7) 5-volt supply circuit in the TP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K22) TP sensor No. 1 signal circuit for a short to the (K7) 5-volt supply circuit. If no, go to next step.
    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. 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. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  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 0.8 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.
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