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Diagnostic Test

  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 step  2

      No 

  2. (F856) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    Fig 1: Checking 5-Volt Supply Circuit
    GC0100005Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Manifold Flow Valve 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 step  6

      No 

      • Go to step  3
  3. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking 5-Volt Supply Circuit
    GC0100008Courtesy of CHRYSLER LLC
    1. Turn the ignition on.
    2. Disconnect the Powertrain Control Module (PCM) 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 step  4

      No 

  4. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT 
    Fig 3: Checking 5-Volt Circuit
    GC0100009Courtesy of CHRYSLER 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 step  5

      No 

  5. (F856) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking 5-Volt Circuit
    GC0100010Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (F856) 5-Volt Supply circuit between the Manifold Flow Valve harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  11

      No 

  6. (K602) MFV SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking MFV Circuit
    GC0100012Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) 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 step  7

      No 

  7. (K602) MFV SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT 
    Fig 6: Checking MFV Circuit
    GC0100013Courtesy of CHRYSLER 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 step  8

      No 

  8. (K602) MFV SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking MFV Circuit
    GC0100014Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (K602) MFV Signal circuit between the Manifold Flow Valve harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  9

      No 

  9. MANIFOLD FLOW VALVE SIGNAL VOLTAGE 
    Fig 8: Checking MFV Circuit
    GC0100016Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) 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 

      • Go to step  10

      No 

      • Go to step  11
  10. MANIFOLD FLOW VALVE 
    1. Turn the ignition off.
    2. Inspect the wiring and connectors between the Manifold Flow Valve and the Powertrain Control Module (PCM).
    3. Look for any chafed, pierced, pinched, or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.

      Were any problems found?

      Yes 

      No 

  11. 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. Refer to any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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