Diagnostic Test

DTC IS ACTIVE
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
  NOTE:
  Diagnose and repair any system voltage or sensor reference voltage DTCs before continuing with this test.
3. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to 2.0L & 2.4L - INTERMITTENT CONDITION .
(F856) 5 VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Measuring Voltage Of 5 Volt Supply Circuit In Manifold Flow Valve Harness Connector
Courtesy 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 between 4.5 and 5.5 volts?
  
  Yes
  - Go To 3.
  No
  - Go To 7.
(K602) MFV SIGNAL CIRCUIT VOLTAGE

Fig 2: Measuring Voltage Of MFV Signal Circuit In Manifold Flow Valve Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage of the (K602) MFV Signal circuit in the Manifold Flow Valve harness connector.
  Is the voltage between 4.5 and 5.5 volts?
  
  Yes
  - Go To 4.
  No
  - Go To 11.
(K900) SENSOR GROUND CIRCUIT TEST
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12 volts, check the (K900) Sensor Ground in the Manifold Flow Valve harness connector.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go To 5.
  No
  - Go To 15.
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO THE (K602) MFV SIGNAL CIRCUIT

Fig 3: Checking MFV Signal Circuit For Short To 5-Volt Supply Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance between the (F856) 5 Volt Supply circuit and the (K602) MFV Signal circuit in the Manifold Flow Valve harness connector.
  Is the resistance above 100 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (F856) 5 Volt Supply circuit for a short to the (K602) MFV Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
MANIFOLD FLOW VALVE
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. Inspect the Manifold Flow Valve for any condition that would result in an incorrect signal, such as damage or contamination.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Manifold Flow Valve in accordance with the service information. Refer to VALVE, MANIFOLD FLOW, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 4: Measuring Voltage Of 5 Volt Supply Circuit In Manifold Flow Valve Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 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 there any voltage present?
  
  Yes
  - Repair the (F856) 5 Volt Supply circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8.
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 5: Checking MFV Supply Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the Manifold Flow Valve harness connector.
  Is the resistance above 100 Ohms?
  
  Yes
  - Go To 9.
  No
  - Repair the (F856) 5 Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 6: Checking 5-Volt Supply Circuit For Short To Sensor Ground Circuit
Courtesy 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 10.
  No
  - Repair the (F856) 5 Volt Supply circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 7: Checking 5-Volt Supply Circuit For Open Or High Resistance
Courtesy 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 16.
  No
  - Repair the (F856) 5 Volt Supply circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(K602) MFV SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 8: Measuring Voltage Of MFV Signal Circuit In Manifold Flow Valve Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (K602) MFV Signal circuit in the Manifold Flow Valve harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K602) MFV Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 12.
(K602) MFV SIGNAL CIRCUIT SHORTED TO GROUND

Fig 9: Checking MFV Signal Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. 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 13.
  No
  - Repair the (K602) MFV Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(K602) MFV SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 10: Checking MFV Signal Circuit For Short To Sensor Ground Circuit
Courtesy 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 14.
  No
  - Repair the (K602) MFV Signal circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(K602) MFV SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 11: Checking MFV Signal Circuit For Open Or High Resistance
Courtesy 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 16.
  No
  - Repair the (K602) MFV Signal circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
(K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 12: Checking Sensor Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (K900) Sensor Ground circuit between the Manifold Flow Valve harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 16.
  No
  - Repair the circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
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 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 2.0L & 2.4L - POWERTRAIN VERIFICATION TEST .