Diagnostic Test

DTC IS ACTIVE
1. Start the engine and allow it to reach normal operating temperature.
  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 can result in personal injury or death.
  
  NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(F855) 5 VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Measuring Voltage Of 5 Volt Supply Circuit In Engine Oil Pressure Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Engine Oil Pressure Sensor connector.
3. Turn the ignition on.
4. Measure the voltage of the (F855) 5 Volt Supply circuit in the Engine Oil Pressure Sensor harness connector.
  Is the voltage above 4.5 volts?
  
  Yes
  - Go to step 6
  No
  - Go to step 3
(F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 2: Measuring Resistance Between Ground And 5 Volt Supply Circuit In Engine Oil Pressure Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (F855) 5 Volt Supply circuit in the Engine Oil Pressure Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (F855) 5 Volt Supply circuit for a short to ground.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 3: Measuring Resistance Between 5 Volt Supply Circuit And Sensor Ground Circuit In Engine Oil Pressure Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (F855) 5 Volt Supply circuit and the (K900) Sensor Ground circuit in the Engine Oil Pressure Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (F855) 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
(F855) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Measuring Resistance Of 5 Volt Supply Circuit Between Engine Oil Pressure Sensor Harness Connector And Appropriate Terminal Of Special Tool #8815
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 Miller Special Tool #8815 to perform diagnosis.
1. Measure the resistance of the (F855) 5 Volt Supply circuit between the Engine Oil Pressure Sensor harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 10
  No
  - Repair the (F855) 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
(G6) EOP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Measuring Resistance Between Ground And EOP Signal Circuit In Engine Oil Pressure Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (G6) EOP Signal circuit in the Engine Oil Pressure Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 7
  No
  - Repair the (G6) EOP Signal circuit for a short to ground.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(G6) EOP SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT

Fig 6: Measuring Resistance Between EOP Signal Circuit And Sensor Ground Circuit In Engine Oil Pressure Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (G6) EOP Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Pressure Sensor harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 8
  No
  - Repair the (G6) EOP 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
(G6) EOP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 7: Measuring Resistance Of EOP Signal Circuit Between Engine Oil Pressure Sensor Harness Connector And Appropriate Terminal Of Special Tool #8815
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 Miller Special Tool #8815 to perform diagnosis.
1. Measure the resistance of the (G6) EOP Signal circuit between the Engine Oil Pressure Sensor harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the (G6) EOP Signal circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
ENGINE OIL PRESSURE SENSOR
1. Turn the ignition off.
2. Connect the Powertrain Control Module (PCM) connector.
3. Turn the ignition on.
4. With the scan tool, read the Engine Oil Pressure Sensor signal voltage.
  NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Replace the Engine Oil Pressure Sensor in accordance with the Service Information.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 10
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil Pressure 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