Diagnostic Test

ACTIVE DTC
1. Crank the engine.
2. Ignition on, engine not running.
3. With a scan tool, read 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 CKP Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.
  Is the voltage between 4.5 and 5.2 volts?
  
  Yes
  - Go to step 3
  No
  - Go to step 10
(K24) CKP SIGNAL CIRCUIT

Fig 2: Checking CKP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage on the (K24) CKP Signal circuit in the CKP 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 CKP 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
(K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 4: Checking CKP Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K24) CKP Signal circuit and the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the short between the (K24) CKP 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
CRANKSHAFT POSITION SENSOR
NOTE: Inspect the slots on the flywheel for damage. If a problem is found repair as necessary.

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 5: Checking CKP 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 (K24) CKP Signal circuit in the CKP Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  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 8
(K24) CKP SIGNAL CIRCUIT OPEN

Fig 6: 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 of the (K24) CKP Signal circuit from the CKP 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 (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 7: 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.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the short to ground 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 13
(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 CKP Sensor harness connector.
  Is the voltage above 5.5 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 from the CKP 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 CKP 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.
  If there are no possible causes remaining, view repair.
  
  Repair
  - 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 CKP SENSOR 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 Crank Position Sensor.
5. Observe the lab scope screen.
6. Look for any pulses generated by the CKP Sensor.
7. Allow the engine to idle.
8. Observe the lab scope screen.
  Did the CKP Sensor generate any erratic pulses?
  
  Yes
  - Inspect the related wire harness and replace the Crankshaft Position Sensor if no wiring problems were found.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 15
ERRATIC CMP 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 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.
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. Look for any pulses generated by the CMP Sensor.
7. Allow the engine to idle.
8. Observe the lab scope screen.
  Did the CMP Sensor generate any pulses?
  
  Yes
  - Inspect the related wire harness and replace the Camshaft Position Sensor if no wiring problems were found.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Test Complete.