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Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    NOTE: Diagnose and repair any Throttle Body circuit, system voltage, or sensor supply voltage DTCs before continuing with this test.
    1. Start the engine and allow it to reach operating temperature.
      WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
    2. With the scan tool select View DTCs.
      NOTE: If the DTC does not reset it may be necessary to test drive the vehicle.
      NOTE: If the P2123-APP Sensor 1 Circuit High DTC is also Active, diagnose the P2123 before continuing with the P0123 diagnostic procedure.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. (F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking 5-Volt Supply Circuit At Throttle Body Harness Connector
    GC0097357Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Throttle Body connector.
    3. Disconnect the Powertrain Control Module (PCM) connector.
    4. Turn the ignition on.
    5. Measure the voltage of the (F855) 5 Volt Supply circuit in the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  3
  3. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: CHECKING TP SIGNAL 1 CIRCUIT FOR SHORT TO VOLTAGE
    GC0097365Courtesy of CHRYSLER LLC
    1. Measure the voltage of the (K22) TP Signal 1 circuit in the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  4
  4. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (F855) 5 VOLT SUPPLY CIRCUIT 
    Fig 3: CHECKING TP SIGNAL 1 CIRCUIT FOR SHORT TO 5 VOLT SUPPLY CIRCUIT
    GC0097366Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between the (K22) TP Signal 1 circuit and the (F855) 5 Volt Supply in the Throttle Body harness connector.

      Is the resistance below 100 ohms?

      Yes 

      No 

      • Go to step  5
  5. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (K124) ETC MOTOR (+) CIRCUIT 
    Fig 4: CHECKING TP SIGNAL 1 CIRCUIT FOR SHORT TO ETC MOTOR (+) CIRCUIT
    GC0097362Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (K22) TP Signal 1 circuit and the (K124) ETC Motor (+) in the Throttle Body harness connector.

      Is the resistance below 100 ohms?

      Yes 

      No 

      • Go to step  6
  6. (K22) TP SIGNAL 1 CIRCUIT SHORTED TO THE (K126) ETC MOTOR (-) CIRCUIT 
    Fig 5: CHECKING TP SIGNAL 2 CIRCUIT FOR SHORT TO ETC MOTOR (-) CIRCUIT
    GC0097363Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (K22) TP Signal 1 circuit and the (K126) ETC Motor (-) in the Throttle Body harness connector.

      Is the resistance below 100 ohms?

      Yes 

      No 

      • Go to step  7
  7. (K22) TP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 6: CHECKING TP SIGNAL 1 CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097364Courtesy of CHRYSLER LLC
    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.
    1. Measure the resistance of the (K22) TP Signal 1 circuit between the Throttle Body harness connector and the appropriate terminal of special tool #8815.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  8

      No 

  8. (K922) TP SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: CHECKING TP SENSOR GROUND CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097367Courtesy of CHRYSLER LLC
    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.
    1. Measure the resistance of the (K922) TP Sensor Ground circuit between the Throttle Body harness connector and the appropriate terminal of special tool #8815.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  9

      No 

  9. THROTTLE BODY 
    Fig 8: CHECKING THROTTLE BODY SIGNAL 1 CIRCUIT
    GC0097368Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) connector.
    3. Connect a jumper wire between the (K22) TP Signal 1 circuit and the (K922) TP Sensor Ground circuit in the Throttle Body harness connector.
    4. Turn the ignition on.
    5. With a scan tool, read the Throttle Body voltage.
      NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus.1 volt) with the jumper wire in place.

      Does the scan tool display the voltage as described above?

      Yes 

      No 

      • Go to step  10
  10. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Refer to any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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