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Diagnostic Test

WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    NOTE:

    Diagnose and repair any system voltage or sensor reference voltage DTCs before continuing with this test.

    1. Start the engine and allow it to reach normal 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, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  2

      No 

  2. (F856) 5 VOLT SUPPLY CIRCUIT VOLTAGE 
    Fig 1: Measuring Voltage Of 5 Volt Supply Circuit In Manifold Flow Valve Harness Connector
    GC0100005Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Manifold Flow Valve harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (F856) 5 Volt Supply circuit in the Manifold Flow Valve harness connector.

      Is the voltage above 4.5 volts?

      Yes 

      • Go To  6

      No 

      • Go To  3
  3. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground And 5 Volt Supply Circuit In Manifold Flow Valve Harness Connector
    GC0100008Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition on.
    2. Disconnect the Powertrain Control Module (PCM) C2 harness connector.
    3. Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the Manifold Flow Valve harness connector.

      Is the resistance above 1000 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (F856) 5 Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between 5 Volt Supply Circuit And Sensor Ground Circuit In Manifold Flow Valve Harness Connector
    GC0100009Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (F856) 5 Volt Supply circuit and the (K900) Sensor Ground circuit in the Manifold Flow Valve harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (F856) 5 Volt Supply circuit for a short to the (K900) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. (F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking 5-Volt Supply Circuit For Open Or High Resistance
    GC0149795Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (F856) 5 Volt Supply circuit between the Manifold Flow Valve harness connector and the PCM C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  10

      No 

      • Repair the (F856) 5 Volt Supply circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  6. (K602) MFV SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Measuring Resistance Between Ground And MFV Signal Circuit
    GC0100012Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance between ground and the (K602) MFV Signal circuit in the Manifold Flow Valve harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K602) MFV Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  7. (K602) MFV SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 6: Measuring Resistance Between MFV Signal Circuit And Sensor Ground Circuit
    GC0100013Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (K602) MFV Signal circuit and the (K900) Sensor Ground circuit in the Manifold Flow Valve harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (K602) MFV Signal circuit for a short to the (K900) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  8. (K602) MFV SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking MFV Signal Circuit For Open Or High Resistance
    GC0149794Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (K602) MFV Signal circuit between the Manifold Flow Valve harness connector and the PCM C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K602) MFV Signal circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  9. MANIFOLD FLOW VALVE 
    Fig 8: Manifold Flow Valve Harness Connector End View
    GC0100016Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Connect the PCM C2 harness connector.
    3. Connect a jumper wire between the (F856) 5 Volt Supply circuit and the (K602) MFV Signal circuit in the Manifold Flow Valve harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the Manifold Flow Valve signal voltage.

      Is the voltage above 4.5 volts with the jumper wire in place?

      Yes 

      • Replace the Manifold Flow Valve in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      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 Manifold Flow Valve 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 Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      • Repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

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