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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. DTC IS ACTIVE 
    1. Start the engine and allow it to reach normal operating temperature. If the engine will not start, crank the engine for at least 10 seconds.
      WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can 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 

      • Go to step  15
  2. (F855) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    Fig 1: CHECKING CKP 5-VOLT SUPPLY CIRCUIT
    GC0097448Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Crankshaft Position Sensor connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (F855) 5-volt Supply circuit in the Crankshaft Position Sensor harness connector.

      Is the voltage between 4.7 and 5.01 volts?

      Yes 

      • Go to step  3

      No 

      • Go to step  6
  3. (K24) CKP SIGNAL CIRCUIT VOLTAGE 
    Fig 2: CHECKING CKP SIGNAL CIRCUIT
    GC0097449Courtesy of CHRYSLER LLC
    1. Measure the voltage of the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.

      Is the voltage between 4.7 and 5.01 volts?

      Yes 

      • Go to step  4

      No 

      • Go to step  10
  4. (K900) SENSOR GROUND CIRCUIT TEST 
    Fig 3: Checking Sensor Ground Circuit
    GC0097450Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Using a 12-volt test light connected to 12 volts, check the (K900) Sensor Ground circuit in the Crankshaft Position Sensor 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 step  5

      No 

      • Go to step  14
  5. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K24) CKP SIGNAL CIRCUIT 
    Fig 4: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO CKP SIGNAL CIRCUIT
    GC0097451Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) harness connector.
    3. Measure the resistance between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  17

      No 

  6. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 5: CHECKING CKP 5-VOLT SUPPLY CIRCUIT
    GC0097448Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (F855) 5-volt Supply circuit in the Crankshaft Position Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  7
  7. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 6: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO GROUND
    GC0097452Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (F855) 5-volt Supply circuit in the Crankshaft Position Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  8

      No 

  8. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 7: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO SENSOR GROUND CIRCUIT
    GC0097453Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (F855) 5-volt Supply circuit and the (K900) Sensor Ground circuit in the Crankshaft Position Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  9

      No 

  9. (F855) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 8: CHECKING 5-VOLT SUPPLY CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097454Courtesy 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 the PCM Pinout Box 8815 to perform diagnosis.
    1. Measure the resistance of the (F855) 5-volt Supply circuit between the Crankshaft Position Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  19

      No 

  10. (K24) CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 9: CHECKING CKP SIGNAL CIRCUIT
    GC0097449Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  11
  11. (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 10: CHECKING CKP SIGNAL CIRCUIT FOR SHORT TO GROUND
    GC0097455Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  12

      No 

  12. (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 11: CHECKING CKP SIGNAL CIRCUIT FOR SHORT TO SENSOR GROUND CIRCUIT
    GC0097456Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (K24) CKP Signal circuit and the (K900) Sensor Ground circuit in the Crankshaft Position Sensor harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go to step  13

      No 

  13. (K24) CKP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 12: CHECKING CKP SIGNAL CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097457Courtesy 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 the PCM Pinout Box 8815 to perform diagnosis.
    1. Measure the resistance of the (K24) CKP Signal circuit between the Crankshaft Position Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  19

      No 

  14. (K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 13: CHECKING SENSOR GROUND CIRCUIT FOR OPEN OR HIGH RESISTANCE
    GC0097458Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (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 8815 to perform diagnosis.
    3. Measure the resistance of the (K900) Sensor Ground circuit between the Crankshaft Position Sensor harness connector and the appropriate terminal of PCM Pinout Box 8815.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  19

      No 

  15. ERRATIC CRANKSHAFT POSITION SENSOR SIGNAL 
    Fig 14: CHECKING CRANKSHAFT POSITION SENSOR FOR IRREGULAR SIGNAL
    GC0097309Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.
      WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
    3. Turn the ignition on.
    4. Wiggle the related wire harness and lightly tap on the Crankshaft Position Sensor.
    5. Observe the lab scope screen.
    6. Look for any pulses generated by the Crankshaft Position Sensor.
    7. Allow the engine to idle.
    8. Observe the lab scope screen.

      Did the Crankshaft Position Sensor generate any erratic pulses?

      Yes 

      • Go to step  17

      No 

      • Go to step  16
  16. ERRATIC CAMSHAFT POSITION SENSOR SIGNAL 
    1. Turn the ignition off.
    2. With a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the Camshaft Position Sensor harness connector.
      WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hand near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
    3. Turn the ignition on.
    4. Wiggle the related wire harness and lightly tap on the Camshaft Position Sensor.
    5. Observe the lab scope screen.
    6. Look for any pulses generated by the Camshaft Position Sensor.
    7. Allow the engine to idle.
    8. Observe the lab scope screen.

      Did the Camshaft Position Sensor generate any pulses?

      Yes 

      • Go to step  18

      No 

  17. CRANKSHAFT POSITION SENSOR 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Crankshaft Position Sensor 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 Crankshaft Position Sensor for any condition that would result in an incorrect signal, such as damage or contamination.

      Were any problems found?

      Yes 

      No 

  18. CAMSHAFT POSITION SENSOR 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft Position Sensor 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 Camshaft Position Sensor for any condition that would result in an incorrect signal, such as damage or contamination.

      Were any problems found?

      Yes 

      No 

  19. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Crankshaft Position Sensor 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 

      No 

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