ECD SYSTEM BASIC INSPECTION

When a malfunction is not confirmed by the DTC (Diagnostic Trouble Code) check, troubleshooting should be carried out for all circuits considered to be possible causes of the malfunction. In many cases, by carrying out the basic engine check shown in the following flowchart, the location of the problem can be found quickly and efficiently. Therefore, use this check troubleshoot the engine.


  1. CHECK BATTERY VOLTAGE

    Note

    Carry out this check with the engine stopped and ignition switch off.

    Standard voltage
    OK NG
    11 V or more Less than 11 V

    NG

    CHARGE OR REPLACE BATTERY
    OK

  2. CHECK IF ENGINE WILL CRANK


    NG

    PROCEED TO PROBLEM SYMPTOMS TABLE
    OK

  3. CHECK AIR FILTER


    1. Visually check that the air filter is not excessively contaminated with dirt or oil.


      NG

      REPLACE AIR FILTER
      OK

  4. CHECK FUEL QUALITY


    1. Check that only diesel fuel has been used.

    2. Check that the fuel does not contain any impurities.


      NG

      REPLACE FUEL
      OK

  5. CHECK FUEL FOR AIR


    NG

    BLEED FUEL OF AIR
    OK

  6. CHECK FUEL PIPES AND HOSES


    1. Check that the fuel pipes and fuel hoses are not blocked, damaged, disconnected, or bent.


      NG

      REPAIR OR REPLACE
      OK

  7. CHECK FUEL FILTER FOR BLOCKAGE


    NG

    REPAIR OR REPLACE
    OK

  8. CHECK ENGINE OIL


    NG

    ADD OR REPLACE ENGINE OIL
    OK

  9. CHECK ENGINE COOLANT


    NG

    ADD OR REPLACE ENGINE COOLANT
    OK

  10. CHECK IDLING SPEED AND MAXIMUM SPEED


    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY
    OK

  11. CHECK BATTERY VOLTAGE, ECM POWER SOURCE VOLTAGE, AND GROUND OF CONDITION OF ECM


    NG

    REPAIR OR REPLACE POWER SOURCE CIRCUIT
    OK

  12. CHECK DIAGNOSTIC CIRCUIT


    NG

    REPAIR OR REPLACE
    OK

  13. CHECK VACUUM PUMP


    NG

    REPAIR OR REPLACE VACUUM PUMP
    OK
    PROCEED TO PROBLEM SYMPTOMS TABLE