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DTC P0122: Throttle Position Sensor #1 Low: Testing

  1. Turn the ignition on. With the DRBIII® scan tool, read the TP sensor voltage. Is the voltage below 0.2 volt? If yes, go to next step. If no, go to step  10.
  2. Turn the ignition off. Disconnect the TP sensor harness connector. Ignition on, engine not running. Measure the voltage of the (K6) 5-volt supply circuit at the TP sensor harness connector. Is the voltage between 4.5 and 5.2 volts? If yes, go to next step. If no, go to step  7.
  3. Turn ignition off. Disconnect the TP sensor harness connector. With the DRBIII® scan tool, monitor the TP sensor voltage. Is the voltage above 4.5 volts? If yes, replace the TP sensor. If no, go to next step.
  4. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K22) TP signal circuit at the TP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K22) TP signal circuit for a short to ground. If no, go to next step.
  5. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K22) TP signal circuit and the (K4) sensor ground 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 (K4) sensor ground circuit. If no, go to next step.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Visually inspect both the component and the PCM connectors. Look for damage, partially broken wires and backed out or corroded terminals. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
  7. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K6) 5-volt supply circuit in the TP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K6) 5-volt supply circuit for a short to ground. If no, go to next step.
    8. 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.
  8. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance in the (K6) 5-volt supply circuit between 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 (K6) 5-volt supply circuit for an open.
  9. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Visually inspect both the component and the PCM connectors. Look for damage, partially broken wires and backed out or corroded terminals. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
  10. Ignition on, engine not running. With the DRBIII® scan tool, monitor the TP sensor voltage. Slowly open the throttle from the idle position to the wide open throttle position. Does voltage start at approximately 0.7 volt and go above 3.5 volts with a smooth transition? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, replace the TP sensor.
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