Diagnostic Test

ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
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 Sensor 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. Observe the lab scope screen.
5. Start the engine.
6. Observe the lab scope screen.
  Are there any irregular or missing signals?
  
  Yes
  - Go to step 3
  No
  - Go to step 8
WIRE HARNESS INSPECTION
1. Turn the ignition off.
2. Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or partially broken wires.
3. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to the proper specification.
5. Perform any Technical Service Bulletins (TSBs) that may apply.
  Were any of the above conditions present?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the CKP Sensor connector.
2. Ignition on, engine not running.
3. Measure the voltage on the (F855) 5-volt Supply circuit in the Sensor harness connector.
  Is the voltage between 4.5 and 5.2 volts?
  
  Yes
  - Go to step 5
  No
  - Repair the open or short to ground in the (F855) 5-volt Supply circuit. Use Miller special tool #8815 when checking for an open circuit to prevent PCM harness connector terminal damage.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
TONE WHEEL/FLEX PLATE INSPECTION
1. Turn the ignition off.
2. Carefully disconnect the Negative Battery (Ground) cable.
3. Remove the Crankshaft Position Sensor.
4. Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.
  Were any problems found?
  
  Yes
  - Repair or replace the Tone Wheel/Flex Plate as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
1. Install the CKP Sensor and connect the battery cable.
  NOTE: An intermittent condition in the Camshaft Position Sensor can cause the P0339 to set.
2. With the a lab scope probe and the Miller special tool 6801, backprobe the (K44) CMP Signal circuit in the Sensor 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 Cam Position Sensor.
5. Observe the lab scope screen.
6. Start the engine.
7. Observe the lab scope screen.
  Are there any irregular or missing signals?
  
  Yes
  - Replace the Cam Position Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
CRANKSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.

Repair
- Replace the Crankshaft Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 2: Checking CKP Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Disconnect the CKP Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage on the (K24) CKP Signal circuit in the Sensor harness connector.
6. Wiggle the related wire harness while taking this measurement.
  Is the voltage above 1 volt?
  
  Yes
  - Repair the short to battery voltage in the (K24) CKP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 9
(K24) CKP SIGNAL CIRCUIT OPEN

Fig 3: Checking CKP 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 in the (K24) CKP Signal circuit from the CKP harness connector to the appropriate terminal of the PCM Pinout Box 8815.
3. Wiggle the wire harness while taking this measurement.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go to step 10
  No
  - Repair the excessive resistance in the (K24) CKP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 4: Checking CKP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K24) CKP Signal circuit in the CKP Sensor harness connector.
2. Wiggle the related wire harness while monitoring the resistance value.
  Does the resistance ever go below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (K24) Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 11
(K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 5: Checking CKP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit in the CKP harness connector.
2. Wiggle the related wire harness while taking this measurement.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the short between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 12
POWERTRAIN CONTROL MODULE (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 .