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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 723 (5.7L - DTCS P000B To P0206 - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0123-Throttle Position Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Diagnose and repair any Throttle Body circuit, system voltage, or sensor supply voltage DTCs before continuing with this test.

    1. Turn the ignition on.
    2. With the scan tool read DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (F855) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Turn the ignition on.
    5. Measure the voltage between ground and the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (F855) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage between ground and the (K22) TPS 1 Signal circuit at the Throttle Body harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (K22) TPS 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Measure the resistance between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply at the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K447) ETC MOTOR (+) CIRCUIT 
    1. Measure the resistance between the (K22) TPS 1 Signal circuit and the (K447) ETC Motor (+) in the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short between the (K22) TPS 1 Signal circuit and the (K447) ETC Motor (+) circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K448) ETC MOTOR (-) CIRCUIT 
    1. Measure the resistance between the (K22) TPS 1 Signal circuit and the (K448) ETC Motor (-) in the Throttle Body harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      • Repair the short between the (K22) TPS 1 Signal circuit and the (K448) ETC Motor (-) circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K22) TPS 1 Signal circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

  8. CHECK THE (K922) TPS SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K922) TPS Sensor Ground circuit between the Throttle Body harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the open in the (K922) TPS Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. THROTTLE BODY 
    1. Turn the ignition off.
    2. Connect the PCM C2 harness connector.
    3. Connect a jumper between the (K22) TPS 1 Signal circuit and the (K922) TPS 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 0.1 volt) with the jumper in place.

      Does the scan tool display the voltage as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  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. Perform any Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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