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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (DTCS P0016 To P0128, Intermittent Condition, Checking Exhaust System, Temperature Sensors, Power & Ground Circuits) >> P0122-Throttle Position Sensor #1 Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1) THROTTLE POSITION SENSOR BELOW 0.2 OF A VOLT 

    Ignition on, engine not running.

    With a scan tool, read the Throttle Position Sensor voltage.

    Is the voltage below 0.2 of a volt? 

    Yes 

    1. Go to  2).

    No 

    1. Go to  10).
  2. 2) (F855) 5 VOLT SUPPLY CIRCUIT 
    Fig 1: Measuring Voltage Of 5-Volt Supply Circuit
    GC0041576Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage of the (F855) 5 volt Supply circuit in the TP Sensor harness connector.

    Is the voltage between 4.5 to 5.2 volts? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  7).
  3. 3) TP SENSOR INTERNAL FAILURE 

    Turn the ignition off.

    Disconnect the TP Sensor harness connector.

    With the scan tool, monitor the TP Sensor voltage.

    Ignition on, engine not running.

    Is the voltage above 4.5 volts? 

    Yes 

    1. Replace the Throttle Position Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (K22) TP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground & TP Sensor No. 1 Signal Circuit
    GC0041577Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TP harness connector.

    Disconnect the PCM harness connector.

    Measure the resistance between ground and the (K22) TP Signal circuit at the TP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K22) TP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  5).
  5. 5) (K22) TP SENSOR SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between TP Signal Circuit & Ground Circuit
    GC0041578Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TP Sensor harness connector.

    Disconnect the PCM harness connector.

    Measure the resistance between the (K22) TP Signal circuit and the (K900) Sensor ground circuit in the TP harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to (K900) Sensor ground in the (K22) TP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  6).
  6. 6) PCM (K22) TP SIGNAL CIRCUIT 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
  7. 7) (F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 4: Measuring Resistance Between Ground & 5-Volt Supply Circuit
    GC0041579Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TP Sensor harness connector.

    Disconnect the PCM harness connector.

    Measure the resistance between ground and the (F855) 5 volt Supply circuit in the TP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F855) 5 volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  8).
  8. 8) (F855) 5 VOLT SUPPLY CIRCUIT OPEN 
    Fig 5: Measuring Resistance Of 5-Volt Supply Circuit
    GC0041580Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TP Sensor harness connector.

    Disconnect the PCM harness connector.

    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.

    Measure the resistance of the (F855) 5 volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  9).

    No 

    1. Repair the open in the (F855) 5 volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  9. 9) PCM (F855) 5 VOLT SUPPLY CIRCUIT 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
  10. 10) THROTTLE POSITION SENSOR SWEEP 

    Ignition on, engine not running.

    With the scan tool, monitor the Throttle Position 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? 

    Yes 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace the Throttle Position Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .
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