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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 728 (6.4L - DTCS P000B To P0205 - 2500 Hd, 3500 Hd) >> Diagnosis And Testing >> P0121-Throttle Position Sensor 1 Performance >> 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. ACTIVE DTC 
    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 may result in possible serious or fatal injury.

    2. With the scan tool, read the active DTCs.
      NOTE:

      If the DTC does not reset it may be necessary to test drive the vehicle.

      Is the DTC Active at this time?

      Yes 

      • Go To  2

      No 

      • Go To  9
  2. CHECK FOR EXCESSIVE RESISTANCE IN THE (K22) TPS 1 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) in line with the PCM C2 harness connector.
    4. Using a Voltmeter perform a voltage drop test. Back probe the (K22) TPS 1 signal circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
    5. Start the engine and allow it idle.
    6. Monitor the Voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  3

      No 

      • Repair the excessive resistance in the (K22) TPS 1 signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK FOR EXCESSIVE RESISTANCE IN THE (K122) TPS 2 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Move the Voltmeter leads to back probe the (K122) TPS 2 Signal circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
    3. Start the engine and allow it idle.
    4. Monitor the Voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  4

      No 

      • Repair the excessive resistance in the (K122) TPS 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK FOR EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Move the Voltmeter leads to back probe the (F855) 5-Volt Supply circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
    3. Start the engine and allow it idle.
    4. Monitor the Voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  5

      No 

      • Repair the excessive resistance in the (F855) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK FOR EXCESSIVE RESISTANCE IN THE (K922) TPS RETURN CIRCUIT 
    1. Turn the ignition off.
    2. Move the Voltmeter leads to back probe the (K922) TPS Return circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
    3. Start the engine and allow it idle.
    4. Monitor the Voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  6

      No 

      • Repair the excessive resistance in the (K922) TPS Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR THE (K22) TPS 1 SIGNAL CIRCUIT SHORTED TO THE (K122) TPS 2 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Disconnect the Throttle Body harness connector.
    4. Measure the resistance between the (K22) TPS 1 Signal circuit and the (K122) TPS 2 Signal circuit at the Throttle Body harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Repair the short between the (K22) TPS 1 Signal circuit and the (K122) TPS 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. THROTTLE POSITION SENSOR 
    1. Turn the ignition off.
    2. Connect the C2 PCM harness connector.
    3. Ignition on, engine not running.
    4. With the scan tool, monitor the TPS 1 and TPS 2 voltage.
    5. Connect a jumper between the (K922) TPS Return circuit and the (K22) TPS 1 Signal circuit.
      NOTE:

      TPS 1 voltage should change from approximately 4.5 volts to less than 0.5 volts.

    6. For TP Sensor No. 2, connect a jumper wire between (F855) 5-Volt Supply circuit and the (K122) TPS 2 Signal circuit.
      NOTE:

      TPS 2 voltage should change from approximately 0 volts to 5.0 volts?

      Is the voltage reading within the listed specification when the jumper is installed?

      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, use a scan tool and select the ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
        NOTE:

        Remove the jumper wire before continuing.

  8. 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. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

  9. THROTTLE FOLLOWER TEST 
    1. Ignition on, engine not running.
    2. With the scan tool, perform the ETC Throttle Follower Test and monitor the TPS 1 or TPS 2 voltage.
    3. Slowly press the throttle pedal down.
    4. The voltage for TPS 1 should start at approximately 0.7 volts and increase to approximately 4.3 volts.
    5. The voltage for TPS 2 should start at approximately 4.3 volts and decrease to approximately 0.7 volts.

      Is the voltage within the range of the listed specification for the appropriate Sensor?

      Yes 

      No 

      • 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, use a scan tool and select the ETC RELEARN function.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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