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Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. MTV PWM FEEDBACK 
    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 can result in personal injury or death.
      NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
    2. With the scan tool, read the MTV PWM Feedback.

      Is the MTV PWM Feedback less than 3%?

      Yes 

      • Go to step  2

      No 

  2. MANIFOLD TUNE VALVE ASSEMBLY 
    1. Turn the ignition off.
    2. Disconnect the Manifold Tune Valve Assembly harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read the MTV PWM Feedback.
      NOTE: The MTV PWM Feedback should be greater than 97% with the connector disconnected.

      Is the MTV PWM Feedback greater than 97%?

      Yes 

      No 

      • Go to step  3
  3. (F855) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    Fig 1: Checking MTV 5-Volt Supply Circuit
    GC0097635Courtesy of CHRYSLER LLC
    1. Measure the voltage of the (F855) 5-Volt Supply circuit in the Manifold Tune Valve Assembly harness connector.

      Is the voltage above 4.5 volts?

      Yes 

      • Go to step  7

      No 

      • Go to step  4
  4. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking MTV 5-Volt Supply Circuit For Short To Ground
    GC0097636Courtesy of CHRYSLER LLC
    1. Turn the ignition on.
    2. Disconnect the C2 Powertrain Control Module (PCM) harness connector.
    3. Measure the resistance between ground and the (F855) 5-Volt Supply circuit in the Manifold Tune Valve Assembly harness connector.

      Is the resistance above 100 ohms?

      Yes 

      • Go to step  5

      No 

  5. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 3: Checking MTV 5-Volt Supply Circuit For Short To Sensor Ground Circuit
    GC0097637Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (F855) 5-Volt Supply circuit and the (K900) Sensor Ground circuit in the Manifold Tune Valve Assembly harness connector.

      Is the resistance above 100 ohms?

      Yes 

      • Go to step  6

      No 

  6. (F855) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking 5-Volt Supply Circuit For Open Or Excessive Resistance
    GC0097638Courtesy of CHRYSLER LLC
    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 diagnosis.
    1. Measure the resistance of the (F855) 5-Volt Supply circuit between the Manifold Tune Valve Assembly harness connector and the appropriate terminal of special tool #8815.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  11

      No 

  7. (K234) MTV SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking MTV Signal Circuit For Short To Ground
    GC0097639Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) harness connector.
    3. Measure the resistance between ground and the (K234) MTV Signal circuit in the Manifold Tune Valve Assembly harness connector.

      Is the resistance above 100 ohms?

      Yes 

      • Go to step  8

      No 

  8. (K234) MTV SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 6: Checking MTV Signal Circuit For Short To Sensor Ground Circuit
    GC0097640Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (K234) MTV Signal circuit and the (K900) Sensor Ground circuit in the Manifold Tune Valve Assembly harness connector.

      Is the resistance above 100 ohms?

      Yes 

      • Go to step  9

      No 

  9. (K234) MTV SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking 5-Volt Supply Circuit For Open Or Excessive Resistance
    GC0097638Courtesy of CHRYSLER LLC
    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 diagnosis.
    1. Measure the resistance of the (K234) MTV Signal circuit between the Manifold Tune Valve Assembly harness connector and the appropriate terminal of special tool #8815.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  10

      No 

  10. (K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 8: CHECKING SENSOR GROUND CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097641Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (K900) Sensor Ground circuit between the Manifold Tune Valve Assembly harness connector and the appropriate terminal of special tool #8815.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  11

      No 

  11. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Manifold Tune Valve Assembly 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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