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.

A01KF09E01
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

  • 2ST OIL PRES relay

*: Using the intelligent tester, 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 intelligent tester. 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

    INSPECT OIL PUMP ASSEMBLY (OIL PRESSURE SWITCHING VALVE OPERATION) Click here

    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 intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester 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

    CHECK OIL PUMP ASSEMBLY (OIL PRESSURE SWITCHING VALVE OPERATION) Click here

    OK

    END

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


    1. Disconnect the oil pressure switching valve assembly connector.

      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 intelligent tester to the DLC3.

    3. Turn the ignition switch to ON and turn the tester 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

    INSPECT ENGINE OIL PRESSURE Click here

    A

  6. INSPECT 2ST OIL PRES RELAY (OIL PRESSURE SWITCHING VALVE RELAY)


    1. Inspect the 2ST OIL PRES relay Click here.


    NG

    REPLACE 2ST OIL PRES RELAY (OIL PRESSURE SWITCHING VALVE RELAY) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (2ST OIL PRES RELAY HOLDER - OIL PRESSURE SWITCHING VALVE ASSEMBLY - ECM)


    1. Remove the 2ST OIL PRES relay (oil pressure switching valve relay) from the engine room relay block.

    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
      Tester Connection Condition Specified Condition
      O3-2 (OSV+) - Body ground* Always 10 kΩ or higher
      2ST OIL PRES relay holder 5 - 2ST OIL PRES relay holder 1 Always 10 kΩ or higher
      2ST OIL PRES relay holder 5 - Body ground* Always 10 kΩ or higher
      2ST OIL PRES relay holder 3 - Body ground* Always 10 kΩ or higher
      E11-25 (EOPV) - Body ground* Always 10 kΩ or higher

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  8. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. REPLACE 2ST OIL PRES RELAY (OIL PRESSURE SWITCHING VALVE RELAY)


    1. Replace the 2ST OIL PRES relay.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  11. INSPECT ENGINE OIL PRESSURE


    1. Inspect the engine oil pressure Click here.


    NG

    REPLACE OIL PRESSURE SWITCHING VALVE ASSEMBLY Click here

    OK

  12. REPLACE OIL PRESSURE SENDER GAUGE ASSEMBLY


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


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  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 intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester 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

    REPAIR OR REPLACE OIL PUMP ASSEMBLY Click here

    OK

    END

  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 intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester 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

    END