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Home › Chrysler › 2009 › 300 LX › Repair and Diagnosis › Engine Performance › System › DTCS P0462 To P0579 › P0521-Engine Oil Pressure Sensor Performance › Diagnostic Test

Diagnostic Test

  1. DTC IS ACTIVE 
    NOTE: Verify that the engine oil is at the proper level. Review oil change history to verify that the oil is changed at the correct intervals and that the proper oil viscosity is used.
    NOTE: Diagnose and repair any Engine Oil Pressure Sensor circuit, system voltage, or sensor supply voltage DTCs before continuing with this test.
    1. Start the engine and allow it to reach 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.
    2. With the scan tool select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. ENGINE OIL/ENGINE MECHANICAL CONDITION 
    NOTE: The following items must be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis.
    • ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
    • ENGINE OIL PRESSURE OUT OF SPECIFICATION
    • LOW ENGINE OIL
    • OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
    • CORRECT VISCOSITY
    • ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
    1. If any of the above conditions are found, repair as necessary.

      Were any problems found?

      Yes 

      No 

      • Go to step  3
  3. (G6) EOP SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage Of EOP Signal Circuit In Engine Oil Pressure Sensor Harness Connector
    GC0097537Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Engine Oil Pressure Sensor connector.
    3. Disconnect the Powertrain Control Module (PCM) connector.
    4. Turn the ignition on.
    5. Measure the voltage of the (G6) EOP Signal circuit in the Engine Oil Pressure Sensor harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  4
  4. (G6) EOP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground And EOP Signal Circuit In Engine Oil Pressure Sensor Harness Connector
    GC0097538Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. 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  5

      No 

  5. (G6) EOP SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between EOP Signal Circuit And Sensor Ground Circuit In Engine Oil Pressure Sensor Harness Connector
    GC0097539Courtesy 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  6

      No 

  6. (F855) 5 VOLT SUPPLY CIRCUIT HIGH RESISTANCE 
    Fig 4: Performing Voltage Drop Test To 5-Volt Supply Circuit
    GC0097540Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.
    3. Using a voltmeter, perform a voltage drop test by backprobing the (F855) 5 Volt Supply circuit at the Engine Oil Pressure Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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.
    4. Start the engine.

      Is the voltage below 0.5 volts?

      Yes 

      • Go to step  7

      No 

  7. (G6) EOP SIGNAL CIRCUIT HIGH RESISTANCE 
    Fig 5: Performing Voltage Drop Test To EOP Signal Circuit
    GC0097541Courtesy 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.
    2. Using a voltmeter, perform a voltage drop test by backprobing the (G6) EOP Signal circuit at the Engine Oil Pressure Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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.
    3. Start the engine.

      Is the voltage below 0.5 volts?

      Yes 

      • Go to step  8

      No 

  8. (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE 
    Fig 6: Performing Voltage Drop Test To Sensor Ground Circuit
    GC0097542Courtesy 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.
    2. Using a voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the Engine Oil Pressure Sensor harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
      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.
    3. Start the engine.

      Is the voltage below 0.5 volts?

      Yes 

      • Go to step  9

      No 

  9. ENGINE OIL PRESSURE SENSOR 
    Fig 7: Engine Oil Pressure Sensor Harness Connector
    GC0097543Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) connector.
    3. Connect a jumper wire between the (G6) EOP Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Pressure Sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the (G6) EOP Signal voltage.
      NOTE: The circuit voltage should change from approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected to 0.0 volts (plus or minus.1 volt) with the jumper wire in place.

      Does the scan tool display the voltage as described above?

      Yes 

      No 

      • Go to step  10
  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 

      No 

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