Diagnostic Test

ACTIVE DTC
1. Crank the engine.
2. Ignition on, engine not running.
3. With a scan tool read the DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Go to step 14
(F855) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the CMP Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.
  Is the voltage between 4.5 and 5.2 volts?
  
  Yes
  - Go to step 3
  No
  - Go to step 10
(K44) CMP SIGNAL CIRCUIT

Fig 2: Checking CMP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.
  Is the voltage between 4.5 and 5.0 volts?
  
  Yes
  - Go to step 4
  No
  - Go to step 7
(K900) SENSOR GROUND CIRCUIT OPEN

Fig 3: Checking Sensor Ground Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
  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 PCM Pinout Box 8815 to perform diagnosis.
3. Measure the resistance of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the open in the (K900) Sensor ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(K44) CMP SIGNAL SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 4: Checking CMP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K44) CMP Signal circuit and the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the short between the (K44) CMP Signal circuit and the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 6
CAMSHAFT POSITION SENSOR
NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.

If there are no possible causes remaining, view repair.

Repair
- Replace the Camshaft Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 5: Checking CMP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Ignition on, engine not running.
4. Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.
  Is the voltage above 0 volts?
  
  Yes
  - Repair the short to battery voltage in the (K44) CMP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 8
(K44) CMP SIGNAL CIRCUIT OPEN

Fig 6: Checking CMP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
  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 PCM Pinout Box 8815 to perform diagnosis.
2. Measure the resistance of the (K44) CMP Signal circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the open in the (K44) CMP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 7: Checking CMP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K44) CMP Signal circuit
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 10
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 8: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Ignition on, engine not running.
4. Measure the voltage on the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.
  Is the voltage above 0 volts?
  
  Yes
  - Repair the short to battery voltage in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 11
(F855) 5-VOLT SUPPLY CIRCUIT OPEN

Fig 9: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
  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 PCM Pinout Box 8815 to perform diagnosis.
2. Measure the resistance of the (F855) 5-volt Supply circuit between the CMP Sensor harness connector to the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 12
  No
  - Repair the open in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 10: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (F855) 5-volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 13
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
ERRATIC CMP SIGNAL
1. With a lab scope probe and the Miller special tool #6801, back probe the (K44) CMP Signal circuit in the CMP harness connector.
  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. Ignition on, engine not running.
3. Wiggle the related wire harness and lightly tap the Camshaft Position Sensor.
4. Observe the lab scope screen.
5. Allow the engine to idle.
6. Observe the lab scope screen.
  Did the CMP Sensor generate any erratic pulses?
  
  Yes
  - Replace the Camshaft Position Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 15
ERRATIC CKP SIGNAL
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 CKP harness connector.
  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.
3. Ignition on, engine not running.
4. Wiggle the related wire harness and lightly tap on the Crankshaft Position Sensor.
5. Observe the lab scope screen.
6. Allow the engine to idle.
7. Observe the lab scope screen.
  Did the CKP Sensor generate any erratic pulses?
  
  Yes
  - Replace the Crankshaft Position Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Test Complete.