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Home >> Dodge and Ram >> 2002 >> Durango Base, 5.9 Z, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - NGC >> Diagnostic Tests >> DTC P0121: Throttle Position Sensor #1 Performance >> Testing

DTC P0121: Throttle Position Sensor #1 Performance: Testing

NOTE: Diagnose any other TP Sensor DTCs before continuing. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . Ensure throttle plate and are free from binding and carbon build-up, and throttle plate should be at idle position. Check for any vacuum leaks.
  1. Turn the ignition on, with the engine off. With the DRBIII(R), read DTCs and record the related Freeze Frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  10 .
  2. With the DRBIII(R), monitor the TP Sensor voltage while slowly depressing the throttle pedal from closed to wide open throttle position. Does voltage start at about 0.8 volt and go more than 3.5 volts with a smooth transition? If yes, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS. If no, go to next step.
    3. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  3. Turn the ignition off. Disconnect the TP Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the 5-volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the high resistance in the 5-volt Supply circuit.
  4. Measure the resistance between ground and the 5-volt Supply circuit in the TP Sensor harness connector. Is the resistance more than one ohm? If yes, go to next step. If no, repair the resistance to ground in the 5-volt Supply circuit.
  5. Turn the ignition off. Reconnect the PCM harness connector. Turn the ignition on, with the engine off. With the DRBIII(R), monitor the TP Sensor voltage. Connect a jumper wire between the TP Signal circuit and the Sensor Ground circuit in the TP Sensor harness connector. Does the TP Sensor voltage change from about 4.9 volts to 0.5 volt? If yes, replace the TP Sensor. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  6. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the TP Signal circuit from the TP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the high resistance in the TP Signal circuit.
  7. Measure the resistance between ground and the TP Signal circuit in the TP Sensor harness connector. Is the resistance more than 100 k/ohms? If yes, go to next step. If no, repair the resistance to ground in the TP Signal circuit.
    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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  8. Measure the resistance of the Sensor Ground circuit from the TP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the high resistance in the Sensor Ground circuit.
    9. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  9. There are no possible causes remaining, replace the PCM.
  10. With the DRBIII(R), monitor the TP Sensor voltage. Slowly open the throttle from the idle position to the wide open throttle position. Does voltage start at about 0.8 volt and go to more than 3.5 volts with a smooth transition? If yes, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS. If no, replace TP Sensor.
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