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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (5.7L - DTCS P2128 To U1418 - NGC - 3500 Cab & Chassis) >> Diagnosis and Testing >> P2174-Low Airflow/Restriction Detected (Instantaneous Accumulation) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    The most likely cause of this DTC is a plugged intake air system or Dirty Throttle Body. Check for TSBs before continuing.

    NOTE:

    Diagnose any 5-Volt Supply, TP Sensor, Fuel System Lean or Rich, or MAP Sensor DTCs before continuing.

    NOTE:

    The throttle plate should be free from binding and carbon build up.

    NOTE:

    Question the customer about weather conditions, as ICE build up on the blade can cause this fault when ambient is around -10° C (14° F) to 4° C (39° F) range.

    1. Ignition on, engine not running.
    2. With a scan tool, select View DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2.

      No 

  2. RESTRICTED AIR INLET SYSTEM 
    1. Turn the ignition off.
    2. Remove the Air Cleaner Assembly.
    3. Remove the Air Filter.
    4. Inspect the Throttle Body opening for signs of any foreign materials.
    5. Check the intake tube/air cleaner for obstructions - include snow packing questions to customer.

      Were any restrictions found?

      Yes 

      No 

      • Go To  3.
  3. MAP SENSOR OPERATION 
    1. Start the engine.
    2. With a scan tool, monitor the MAP Sensor voltage.
    3. Snap the Accelerator pedal.

      Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at Wide Open Throttle?

      Yes 

      • Go To  4.

      No 

      • Go To  13.
  4. TP SENSOR OPERATION 
    1. Ignition on, engine not running.
    2. With a scan tool, perform the ETC Throttle Follower Test.
    3. TP Sensor No. 1 should start at approximately 0.7 of a volt and increase to 4.3 volts.
    4. TP Sensor No. 2 should start at approximately 4.3 volts and decrease to 0.7 of a volt.

      Is the voltage transition smooth between the appropriate values?

      Yes 

      No 

      • Go To  5.
  5. RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Measuring Resistance Of (F855) 5-volt Supply Circuit From Throttle Body Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090677Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Throttle Body harness connector.
    3. Disconnect the C2 PCM 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 PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.

    4. Measure the resistance of the (F855) 5-volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 100 ohms?

      Yes 

      • Go To  6.

      No 

      • Repair the excessive resistance in the (F855) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground And 5-volt Supply Circuit AT Throttle Body Harness Connector
    GC0090678Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and (F855) 5-volt Supply circuit at the Throttle Body harness connector.

      Is the resistance above 100k ohms?

      Yes 

      • Go To  7.

      No 

      • Repair the short to ground in the (F855) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. TP SENSOR 
    Fig 3: TP Sensors
    GC0090672Courtesy of CHRYSLER LLC
    1. Connect the PCM harness connectors.
    2. Ignition on, engine not running.
    3. With a scan tool, monitor the TP Sensor voltage.
    4. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector.
    5. TP Sensor No. 1 voltage should start at approximately 4.8 volts and decrease to 0.2 of a volt.
    6. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-volt Supply circuit in the Throttle Body harness connector.
    7. TP Sensor No. 2 voltage should start at approximately 0 volts and increase to 4.8 to 5.2 volts.

      Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed?

      Yes 

      • Disconnect the Battery before replacing the Throttle Body Assembly. Replace 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.
  8. RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT 
    Fig 4: Measuring Resistance Of TP Sensor No. 1 Signal Circuit Between Throttle Body Harness Connector & Appropriate Terminal Of Special Tool #8815
    GC0090676Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C2 PCM harness connector.
    3. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  9.

      No 

      • Repair the excessive resistance in the (K22) TP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT 
    Fig 5: Measuring Resistance Of (K122) TP Sensor No. 2 Signal Circuit From Throttle Body Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090751Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  10.

      No 

      • Repair the excessive resistance in the (K122) TP Sensor No. 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  10. (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 6: Measuring Resistance Between Ground And TP Sensor No. 1 Signal Circuit AT Throttle Body Harness Connector
    GC0090674Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector.

      Is the resistance above 100k ohms?

      Yes 

      • Go To  11.

      No 

      • Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 7: Measuring Resistance Between Ground And (K122) TP Sensor No. 2 Signal Circuit AT Throttle Body Harness Connector
    GC0090752Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector.

      Is the resistance above 100k ohms?

      Yes 

      • Go To  12.

      No 

      • Repair the short to ground in the (K122) TP Sensor No. 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  12. RESISTANCE IN (K922) TP SENSOR RETURN CIRCUIT 
    Fig 8: Measuring Resistance Of (K922) TP Sensor Return Circuit From Throttle Body Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090682Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  19.

      No 

      • Repair the excessive resistance in the (K922) TP Sensor Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  13. RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 9: Measuring Resistance Of 5-volt Supply Circuit From MAP Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090652Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the MAP Sensor harness connector.
    3. Disconnect the C1 PCM 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 PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.

    4. Measure the resistance of the (F856) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  14.

      No 

      • Repair the excessive resistance in the (F856) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  14. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 10: Measuring Resistance Between Ground And (F856) 5-volt Supply Circuit In MAP Sensor Harness Connector
    GC0090653Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

      Is the resistance above 100k ohms?

      Yes 

      • Go To  15.

      No 

      • Repair the short to ground in the (F856) 5-volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  15. MAP SENSOR 
    Fig 11: MAP Sensor Harness Connector
    GC0090654Courtesy of CHRYSLER LLC
    1. Connect the PCM harness connectors.
    2. Ignition on, engine not running.
    3. With a scan tool, monitor the MAP Sensor voltage.
    4. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit.
    5. Cycle the ignition switch from off to on.
    6. With a scan tool, monitor the MAP Sensor voltage.

      Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 volt with the jumper wire installed?

      Yes 

      No 

      • Go To  16.
        • NOTE:

        Remove the jumper wire before continuing.

  16. RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT 
    Fig 12: Measuring Resistance Of MAP Sensor Signal Circuit Between Harness Connector And Appropriate Terminal Of Special Tool #8815
    GC0090651Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C2 PCM harness connector.
    3. Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  17.

      No 

      • Repair the excessive resistance in the (K1) MAP Signal circuit
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  17. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 13: Measuring Resistance Between Ground And MAP Sensor Signal Circuit AT Harness Connector
    GC0090649Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

      Is the resistance above 100k ohms?

      Yes 

      • Go To  18.

      No 

      • Repair the short to ground in the (K1) MAP Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  18. RESISTANCE IN (K900) SENSOR GROUND CIRCUIT 
    Fig 14: Measuring Resistance Of (K900) Sensor Ground Circuit From MAP Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0090657Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (K900) Sensor ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance below 5.0 ohms?

      Yes 

      • Go To  19.

      No 

      • Repair the excessive resistance in the (K900) Sensor ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  19. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor, 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 MAP Sensor, Throttle Body, and the Powertrain Control Module connectors.
    4. Refer to any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Replace and program the Powertrain Control Module per Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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