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Home › Chrysler › 2006 › 300 Base, 42RLE/VLP › Repair and Diagnosis › Engine Performance › System › Engine Controls - DTCS P0122 To P0175 › Diagnosis And Testing › P0122-Throttle Position Sensor 1 Circuit Low › Diagnostic Test

Diagnostic Test

  1. 1)  ACTIVE DTC 
    NOTE: If a 5-Volt Supply DTC has also set, diagnose the 5-Volt DTC before continuing.

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  10).
  2. 2)  P0222 ALSO SET 

    Was the P0222-TP SENSOR NO.2 VOLTAGE LOW DTC set along with the P0122? 

    Yes 

    1. Go To  3).

    No 

    1. Go To  4).
  3. 3)  (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Checking Throttle Body 5-Volt Supply Circuit
    GC0014801Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Throttle Body harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle Body harness connector.

    Is the voltage between 4.8 to 5.2 volts? 

    Yes 

    1. Go To  4).

    No 

    1. Go To  7).
  4. 4)  THROTTLE POSITION SENSOR 

    With a scan tool, monitor the TP Sensor No.1 voltage with the Sensor harness connector disconnected.

    Is the voltage above 4.5 volts? 

    Yes 

    1. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  5).
  5. 5)  (K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Throttle Position Sensor 1 Signal Circuit For Short To Ground
    GC0014792Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Measure the resistance between ground and the (K22) TP Sensor No.1 Signal circuit in the Throttle Body harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K22) TP Sensor No.1 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  6).
  6. 6)  (K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO THE (K922) SENSOR RETURN CIRCUIT 
    Fig 3: Checking Throttle Position Sensor 1 Signal Circuit & Return Circuit
    GC0014802Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K22) TP Sensor No.1 Signal circuit and the (K922) Sensor Return circuit in the Throttle Body harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short between the (K922) Sensor Return circuit and the (K22) TP Sensor No.1 Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  9).
  7. 7)  (F855) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 4: Checking Throttle Position Sensor 5-Volt Supply Circuit Resistance
    GC0014794Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    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 diagnostics.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  8).

    No 

    1. Repair the open in the (F855) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  8. 8)  (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking Throttle Position Sensor 5-Volt Supply Circuit For Short To Ground
    GC0014795Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (F855) 5-volt Supply circuit in the Throttle Body 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  9).
  9. 9)  PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module per Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
  10. 10)  THROTTLE FOLLOWER TEST 

    With a scan tool, perform the Throttle Follower Test.

    Monitor the TP Sensor No.1 voltage.

    Does voltage start at approximately 0.8 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. Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select ETC RELEARN function.
    2. Perform POWERTRAIN VERIFICATION TEST .
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