LUBRICATION SYSTEM (for DPF) ON-VEHICLE INSPECTION


  1. INSPECT OIL QUALITY


    1. Check the engine oil for deterioration, water contamination, discoloration or thinning.

      If the quality is visibly poor, replace the engine oil and oil filter element Click here.

  2. INSPECT ENGINE OIL LEVEL


    1. Warm up the engine, stop the engine and wait 5 minutes. The engine oil level should be between the engine oil level dipstick low level mark and full level mark.

      If low, check for leakage and add oil up to the full level mark.

      Note

      Do not fill engine oil above the full level mark.

      Tech Tips

      A certain amount of engine oil will be consumed while driving. In the following situations, oil consumption may increase, and engine oil may need to be refilled in between oil maintenance intervals.


      • When the engine is new, for example directly after purchasing the vehicle or after replacing the engine.

      • If low quality oil or oil of an inappropriate viscosity is used.

      • When driving at high engine speed or with a heavy load, (when towing, or), when driving while accelerating or decelerating frequently.

      • When leaving the idling for a long time, or when driving frequently through heavy traffic.

      When judging the amount of oil consumption, keep in mind that the oil may have become diluted, making it difficult to judge the true level accurately.

  3. INSPECT OIL PRESSURE


    1. Check the condition of the oil pressure warning light and oil level warning light.

      Note

      If the ignition switch is turned off, the warning lights do not illuminate the next time the engine is started. Therefore, checking the vehicle after it has been brought in for service will not be of any use for troubleshooting. It is essential to ask the customer whether the warning lights were illuminated or not when the malfunction occurred.

      - Condition 1 Condition 2 Condition 3 Condition 4
      Oil Pressure Warning Light Illuminated Illuminated Illuminated Illuminated
      Oil Level Warning Light Illuminated Illuminated Not illuminated Not illuminated
      DTC Output (MIL does not illuminate) P0524 None P0524 None
      Possible Cause

      • Intake of air into an oil line due to a decrease in the amount of engine oil, or oil pressure stuck at a low value (a DTC is stored as the oil pressure does not increase when the system switches to high oil pressure control mode)

      • Clogging in an oil line (the oil strainer, etc.), or a problem with the oil pump

      • Intake of air into an oil line due to a decrease in the amount of engine oil

      • Clogging in an oil line (the oil strainer, etc.), or a problem with the oil pump

      • Oil pressure stuck at a low value (a DTC is stored as the oil pressure does not increase when the system switches to high oil pressure control mode)

      • Clogging in an oil line (the oil strainer, etc.), or a problem with the oil pump

      		 Clogging in an oil line (the oil strainer, etc.), or a problem with the oil pump
      Solution to Problem

      • Add engine oil so that the oil level is within the specified range and perform an oil pressure control system check. If the results of the check are normal, it is likely that the illumination of the warning light was caused by oil consumption (if the amount of oil consumption is large, check the oil consumption and perform repairs). If the results of the check are abnormal, it is likely that the problem was caused by the oil pressure control system being stuck in low pressure oil control mode Click here.

      • Perform an oil pressure inspection. If the results are abnormal, repair the engine.

      • Perform the inspection procedure for DTC P0524 Click here.

      • Perform an oil pressure inspection. If the results are abnormal, repair the engine.

      		 Perform an oil pressure inspection. If the results are abnormal, repair the engine.

      Tech Tips


      • Under normal conditions, the oil pressure warning light and oil level warning light are not illuminated.

      • When performing a check of the oil pressure control system, if the system does not switch from high oil pressure control mode, one of the following may be the cause of the problem.


        • The sleeve valve is locked in the position for high oil pressure.

        • The EFI main relay is malfunctioning.

        • The oil pressure switching valve is stuck off.

      • If a DTC is stored but the cause of the problem cannot be found, either of the following may be the cause of the problem.


        • Engine oil was added by the customer due to a lack of engine oil.

        • The system was temporarily stuck in low oil pressure control mode (foreign matter was stuck in the system, etc.)

      • Check the oil pressure control system using the following procedure.

    2. Check the oil pressure control system (when using the intelligent tester).

      Reference
      Purpose of Check When to Perform Check
      This check is used to check whether the oil pressure control system is operating properly when the oil pressure switching valve is forcibly operated. Perform this check when DTC P0524 is output.

      1. Connect the intelligent tester to the DLC3.

      2. Start the engine and warm it up.

        Tech Tips

        Confirm that the engine coolant temperature is 70°C to 89°C (158°F to 192°F), as the oil pressure changes according to the engine coolant temperature.

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

      4. Check the following table and perform the oil pressure control system check.

        Tech Tips


        • Even when the engine is warmed up, there are some instances where the oil pressure control system check cannot be performed.

        • The engine speed will increase during the oil pressure control system check.

        Item Condition Content of Check System Operation
        Oil Pressure Control System Check

        • Engine is idling

        • Vehicle is stopped

        • Shift lever is in neutral

        • Engine coolant temperature is in specified range

        1. Valve turns off (high oil pressure control mode)

        2. Valve turns on (low oil pressure control mode)

        3. Valve turns off (high oil pressure control mode)

        		 The average oil pressure over 1 second when the valve is operated is displayed.

        Details:

        The oil pressure is measured for 1 second when the valve is operated, and the value measured every 0.1 seconds is displayed for each valve state [1 to 3].

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

        Reference Oil Pressure
        Item Specified Condition
        Valve Off (High Pressure Control Mode)

        170 to 450 kPa (1.7 to 4.6 kgf/cm2, 25 to 65 psi)
        Valve On (Low Pressure Control Mode)

        120 to 230 kPa (1.2 to 2.3 kgf/cm2, 17 to 33 psi)

      6. 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 (0.5 kgf/cm2, 7.3 psi) or higher
        A01ITMFE01
        Text in Illustration
        *a Oil Pressure Sensor Output *b Engine Speed
        *c Oil Pressure Control Mode (State of Oil Pressure Switching Valve) *d Active Test Activation Request
        *e High Oil Pressure *f Low Oil Pressure
        *g 2000 rpm *h Idle Speed
        *i On (Low Oil Pressure Control Mode) *j Off (High Oil Pressure Control Mode)
        *k On *l Off
        *m Approximately 5 seconds - -

    3. Check the oil pressure control system (when not using the intelligent tester).

      Tech Tips

      When not using the intelligent tester, it is not possible to determine whether the system is stuck in high oil pressure control mode.


      1. Inspect the oil pressure according to the procedure listed below under "Inspect Engine Oil Pressure".

        Standard Oil Pressure
        Condition Specified Condition
        Idling

        50 kPa (0.5 kgf/cm2, 7.3 psi) or higher
        Engine running at 2500 rpm

        200 kPa (2.0 kgf/cm2, 29 psi) or higher
        Engine running at 3500 rpm

        250 kPa (2.5 kgf/cm2, 36 psi) or higher

        Tech Tips

        The possible cause can be determined based on the results of the oil pressure inspection (refer to the following table).

        Measurement Results
        - Condition 1 Condition 2
        Idling Normal Abnormal
        Engine running at 2500 rpm Abnormal Abnormal
        Engine running at 3500 rpm Abnormal Abnormal
        Possible Cause Oil pressure control stuck in low oil pressure control mode Clogging in an oil line (the oil strainer, etc.), or a problem with the oil pump

  4. INSPECT ENGINE OIL PRESSURE


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

    2. A01IOCNE01
      Text in Illustration
      *1 Oil Pressure Gauge
      *2 Adapter

      Install an oil pressure gauge with an adapter.

    3. Warm up the engine.

      Tech Tips

      Confirm that the engine coolant temperature is 70°C (158°F) or higher after the engine is warmed up, as the oil pressure changes according to the engine coolant temperature.

    4. Measure the engine oil pressure.

      Standard Oil Pressure
      Condition Specified Condition
      Idling

      50 kPa (0.5 kgf/cm2, 7.3 psi) or higher
      Engine running at 2500 rpm

      200 kPa (2.0 kgf/cm2, 29 psi) or higher
      Engine running at 3500 rpm

      250 kPa (2.5 kgf/cm2, 36 psi) or higher

      Tech Tips

      When the oil pressure sender gauge assembly is removed, the oil pressure control system operates in high oil pressure control mode.

    5. Remove the oil pressure gauge and adapter.

    6. Install the oil pressure sender gauge assembly Click here.

    7. Inspect for engine oil leaks Click here.