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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (5.7L - DTCS P000B To P0175 - 2500 Hd) >> DTC Troubleshooting >> P0123-Throttle Position Sensor 1 Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  3

      No 

      • Go To  2
  2. PERFORM THE THROTTLE FOLLOWER TEST AND CHECK TPS 1 OPERATION 
    1. With the scan tool, perform the ETC Throttle Follower Test.
    2. Monitor the TPS 1 voltage.
    3. Slowly press the accelerator pedal down.
      NOTE:

      The voltage for TPS 1 should start at approximately 0.7 volts and increase to approximately 4.3 volts.

      Is the TPS 1 voltage within the range of the listed specification?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any system voltage or 5-Volt Reference DTCs active or pending?

      Yes 

      No 

      • Go To  4
  4. 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  5
  5. 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  6
  6. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Check for continuity between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.

      Is there continuity between the (K22) TPS 1 Signal circuit and the (F855) 5-Volt Supply circuit?

      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  7
  7. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K447) ETC MOTOR (+) CIRCUIT 
    1. Check for continuity between the (K22) TPS 1 Signal circuit and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.

      Is there continuity between the (K22) TPS 1 Signal circuit and the (K447) ETC Motor (+) circuit?

      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  8
  8. CHECK THE (K22) TPS 1 SIGNAL CIRCUIT FOR A SHORT TO THE (K448) ETC MOTOR (-) CIRCUIT 
    1. Check for continuity between the (K22) TPS 1 Signal circuit and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.

      Is there continuity between the (K22) TPS 1 Signal circuit and the (K448) ETC Motor (-) circuit?

      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  9
  9. 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  10

      No 

      • Repair the (K22) TPS 1 Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  10. 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  11

      No 

      • Repair the (K922) TPS Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. CHECK THE ABILITY OF THE PCM TO READ THE TPS 1 SIGNAL 
    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.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  12
  12. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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