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.

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 ten 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
(F856) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: CHECKING CMP SENSOR 5-VOLT SUPPLY CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Camshaft Position Sensor connector.
3. Turn the ignition on.
4. Measure the voltage of the (F856) 5-volt Supply circuit in the Camshaft Position Sensor harness connector.
  Is the voltage between 4.7 and 5.1 volts?
  
  Yes
  - Go to step 3
  No
  - Go to step 6
(K44) CMP SIGNAL CIRCUIT VOLTAGE

Fig 2: CHECKING CMP SIGNAL CIRCUIT
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (K44) CMP Signal circuit in the Camshaft Position Sensor harness connector.
  Is the voltage between 4.7 and 5.1 volts?
  
  Yes
  - Go to step 4
  No
  - Go to step 10
(K900) SENSOR GROUND CIRCUIT TEST

Fig 3: CHECKING SENSOR GROUND CIRCUIT
Courtesy 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 Camshaft 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
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K44) CMP SIGNAL CIRCUIT

Fig 4: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO CMP SIGNAL CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C1 Powertrain Control Module (PCM) harness connector.
3. Measure the resistance between the (F856) 5-volt Supply circuit and the (K44) CMP Signal circuit in the Camshaft Position Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 17
  No
  - Repair the (F856) 5-volt Supply circuit for a short to the (K44) CMP Signal circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 5: CHECKING CMP SENSOR 5-VOLT SUPPLY CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C1 Powertrain Control Module (PCM) harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (F856) 5-volt Supply circuit in the Camshaft Position Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 6: CHECKING CMP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (F856) 5-volt Supply circuit in the Camshaft Position Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (F856) 5-volt Supply circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 7: CHECKING 5-VOLT SUPPLY CIRCUIT FOR SHORT TO SENSOR GROUND CIRCUIT
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (F856) 5-volt Supply circuit and the (K900) Sensor Ground circuit in the Camshaft Position Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the (F856) 5-volt Supply circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F856) 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 8: CHECKING 5-VOLT SUPPLY CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy 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 (F856) 5-volt Supply circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 19
  No
  - Repair the (F856) 5-volt Supply circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 9: CHECKING CMP SIGNAL CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C2 Powertrain Control Module (PCM) harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (K44) CMP Signal circuit in the Camshaft Position Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K44) CMP Signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 11
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 10: CHECKING CMP SIGNAL CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (K44) CMP Signal circuit in the Camshaft Position Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 12
  No
  - Repair the (K44) CMP Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 11: CHECKING CMP SIGNAL CIRCUIT FOR SHORT TO SENSOR GROUND CIRCUIT
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K44) CMP Signal circuit and the (K900) Sensor Ground circuit in the Camshaft Position Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 13
  No
  - Repair the (K44) CMP Signal circuit for a short to the (K900) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K44) CMP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 12: CHECKING CMP SIGNAL CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy 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 (K44) CMP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 19
  No
  - Repair the (K44) CMP Signal circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 13: CHECKING CMP SENSOR GROUND CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) 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 Camshaft Position Sensor harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 19
  No
  - Repair the (K900) Sensor Ground circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
ERRATIC CAMSHAFT POSITION SENSOR SIGNAL

Fig 14: CHECKING CAMSHAFT POSITION SENSOR FOR ERRATIC SIGNAL
Courtesy of CHRYSLER LLC
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 erratic pulses?
  
  Yes
  - Go to step 17
  No
  - Go to step 16
ERRATIC CRANKSHAFT POSITION SENSOR SIGNAL

Fig 15: CHECKING CRANKSHAFT POSITION SENSOR FOR IRREGULAR SIGNAL
Courtesy 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 pulses?
  
  Yes
  - Go to step 18
  No
  - Refer to the CHECKING FOR AN INTERMITTENT DTC. Refer to Non-DTC Diagnostics/Driveability - Gas - Diagnosis and Testing .
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
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace the Camshaft Position Sensor.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
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
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace the Crankshaft Position Sensor.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
POWERTRAIN CONTROL MODULE (PCM)
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. 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
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .