ECD SYSTEM BASIC INSPECTION

When a malfunction cannot be confirmed by checking DTCs, troubleshooting should be performed on all circuits that are possible causes of the problem. However, in most cases, performing the basic engine check shown below can help you find the problem quickly and efficiently. Always perform this check first when troubleshooting the engine.

1. CHECK BATTERY VOLTAGE

   Note

   Check the battery voltage with the engine stopped and the ignition switch OFF.

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

   
   

   NG

   CHARGE OR REPLACE BATTERY

   OK

2. CHECK IF ENGINE CRANKS

   
   

   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

      CLEAN OR REPLACE AIR FILTER

      OK

4. CHECK FUEL QUALITY

   
   

   1. Check that only diesel fuel is present.

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

      
      

      NG

      DRAIN AND REFILL FUEL

      OK

5. CHECK FUEL SYSTEM FOR AIR

   
   

   NG

   BLEED AIR FROM FUEL SYSTEM

   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

   CLEAN OR REPLACE

   OK

8. CHECK ENGINE OIL

   
   

   NG

   ADD OR DRAIN AND REFILL

   OK

9. CHECK ENGINE COOLANT

   
   

   NG

   ADD OR DRAIN AND REFILL ENGINE COOLANT

   OK

10. CHECK IDLE SPEED AND MAXIMUM ENGINE SPEED

    
    

    NG

    REPLACE SUPPLY PUMP ASSEMBLY

    OK

11. CHECK DIAGNOSTIC CIRCUIT

    
    

    NG

    REPAIR OR REPLACE

    OK

12. CHECK VACUUM PUMP

    
    

    NG

    REPAIR OR REPLACE VACUUM PUMP

    OK

    PROCEED TO PROBLEM SYMPTOMS TABLE