ECD SYSTEM (w/ DPF), Diagnostic DTC:P0524

DTC Code DTC Name
P0524 Engine Oil Pressure Too Low

DESCRIPTION

The oil pressure control system reduces and increases engine oil pressure using the oil pressure switching valve in the timing gear case assembly. When the engine speed reaches 3000 rpm while racing the engine after warming it up, the oil pressure switching valve operates and the engine oil pressure system changes from low pressure control mode to high pressure control mode. When the engine speed drops to 2800 rpm, the engine oil pressure system changes from high pressure control mode to low pressure control mode. The oil pressure sender gauge assembly detects the engine oil pressure.

B007THGE01
P0524
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After warming up the engine, race the engine at 3000 rpm or higher.*

Conditions (a) and (b) continue for 5 seconds or more (1 trip detection logic):

(a) 0.3 seconds have elapsed after sending a command to change from low oil pressure control mode to high oil pressure control mode.

(b) The oil pressure control system does not change to high oil pressure control mode.


  • Short in oil pressure sender gauge assembly circuit

  • Oil pressure switching valve relay

  • Oil pressure sender gauge assembly

  • Oil pressure switching valve assembly

  • ECM

  • Oil pump assembly

  • Engine oil amount insufficient

*: Using the GTS, the oil pressure control system can be inspected by performing Engine Oil Pressure Control Check. Enter the following menus: Powertrain / Engine and ECT/ Utility / Engine Oil Pressure Control Check.

Tech Tips

Checking the state of the oil level warning light and oil pressure warning light will help in understanding why this DTC was stored Click here.

Related Data List
DTC No. Data List
P0524

Engine Oil Pressure

Eng Oil Press Switch Valve

WIRING DIAGRAM

Refer to DTC P0522 Click here

INSPECTION PROCEDURE

Note


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips


  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

  • An output DTC does not necessarily indicate that there is a malfunction. DTCs may have been stored due to an insufficient engine oil amount even though the oil level warning light is currently not illuminated, such as when engine oil is added by the customer.

PROCEDURE


  1. CHECK ENGINE OIL LEVEL


    1. Check the engine oil level Click here.

    2. Check the state of the oil level warning light.

      Result
      Result Proceed to
      Engine oil level is low and oil level warning light is illuminated A
      Engine oil level is within the specified range and oil level warning light is not illuminated B

      Tech Tips

      If the oil level warning light is not illuminated even though the engine oil level is lower than the Low mark, or the oil level warning light is illuminated even though the engine oil level is within the specified range, inspect the oil level sensor and related parts for malfunctions.


    B
    A
  2. CHECK ENGINE OIL LEAKS


    1. Check for engine oil leaks.

      Result
      If there are engine oil leaks, perform repairs.

    NEXT
  3. ADD ENGINE OIL


    1. Add engine oil.


    NEXT
  4. INSPECT OIL PUMP ASSEMBLY (OIL PRESSURE SWITCHING VALVE OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine and warm it up.

    4. Enter the following menus: Powertrain / Engine and ECT / Utility / Engine Oil Pressure Control Check Click here.

    5. Compare the "valve off" (high pressure control mode) and "valve on" (low pressure control mode) oil pressure values and check the difference.

      Standard
      50 kPa or higher.

    NG
    OK
  5. CHECK OIL PUMP ASSEMBLY (OIL PRESSURE SWITCHING VALVE OPERATION)


    1. Disconnect the connector of the oil pressure switching valve assembly.

      Note


      • Make sure that the engine is stopped before disconnecting the connector of the oil pressure switching valve assembly.

      • Make sure that the disconnected connector does not get caught in moving engine parts.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine and ECT / Utility / Engine Oil Pressure Control Check Click here.

    6. Check the engine oil pressure value.

      Result
      Result Proceed to
      Engine oil pressure rises to between 170 and 450 kPa A
      Except above B

      Tech Tips

      Low oil pressure control mode is not performed when the connector of the oil pressure switching valve assembly is disconnected. Therefore, if the measurement results from Engine Oil Pressure Control Check all indicate oil pressure values which are high, it can be determined that there is an electrical malfunction.


    B
    A
  6. INSPECT OIL PRESSURE SWITCHING VALVE RELAY (OSV)


    1. Inspect the oil pressure switching valve relay (OSV) Click here.


    NG
    OK
  7. CHECK HARNESS AND CONNECTOR


    1. Remove the oil pressure switching valve relay (OSV) from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the oil pressure switching valve assembly connector.

    3. Disconnect the ECM connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D89-2 (OSV+) - Body ground* Always 10 kΩ or higher
      10A-1 - 10A-2 Always 10 kΩ or higher
      10A-1 - Body ground* Always 10 kΩ or higher
      10A-4 - Body ground* Always 10 kΩ or higher
      D99-39 (EOPV) - Body ground* Always 10 kΩ or higher

      Tech Tips

      *: Make sure that there are no short circuits to the battery

    5. Reinstall the oil pressure switching valve relay (OSV).

    6. Reconnect the oil pressure switching valve assembly connector.

    7. Reconnect the ECM connector.


    NG
    OK
  8. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  9. REPLACE OIL PRESSURE SWITCHING VALVE RELAY (OSV)


    1. Replace the oil pressure switching valve relay (OSV).


    NEXT
  10. REPAIR OR REPLACE HARNESS AND CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  11. INSPECT ENGINE OIL PRESSURE


    1. Inspect the engine oil pressure Click here.


    NG
    OK
  12. REPLACE OIL PRESSURE SENDER GAUGE ASSEMBLY


    1. Replace the oil pressure sender gauge assembly Click here.


    NEXT
  13. REPLACE OIL PRESSURE SWITCHING VALVE ASSEMBLY


    1. Replace the oil pressure switching valve assembly Click here.


    NEXT
  14. INSPECT OIL PUMP ASSEMBLY (OIL PRESSURE SWITCHING VALVE OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine and warm it up.

    4. Enter the following menus: Powertrain / Engine and ECT / Utility / Engine Oil Pressure Control Check Click here.

    5. Compare the "valve off" (high pressure control mode) and "valve on" (low pressure control mode) oil pressure values and check that the oil pressure has risen.

      Standard
      50 kPa or higher.

    NG
    OK
  15. REPAIR OR REPLACE OIL PUMP ASSEMBLY


    1. Repair or replace the oil pump assembly.

      Tech Tips

      If the oil pressure does not rise after disconnecting the connector of the oil pressure switching valve assembly, or if the oil pressure changes, but the difference between the low oil pressure and high oil pressure is small, a mechanical malfunction is probably the cause.


      • The sleeve is locked due to foreign matter.

      • The oil pressure relief valve is locked due to foreign matter.

      • The check valve is stuck.


    NEXT
  16. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine and warm it up.

    4. Enter the following menus: Powertrain / Engine and ECT / Utility / Engine Oil Pressure Control Check Click here.

    5. Compare the "valve off" (high pressure control mode) and "valve on" (low pressure control mode) oil pressure values and check that the oil pressure has risen.


    NEXT