Inspection Procedure

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the PROBLEM SYMPTOMS TABLE .

1. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch ON and turn the Techstream ON.
   3. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Fuel Pump/Speed.
   4. Check whether operating sounds can be heard while operating the relay using the Techstream.

      OK: 

      Operating sounds can be heard from relay. 

      NG: Go to step  4

      OK: Go to next step 

2. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)  (See INSPECTION PROCEDURE )

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

3. REPLACE FUEL PUMP ECU 
   1. Replace the fuel pump ECU (see REMOVAL ).
   2. Check the fuel pump operation.

      OK: 

      Malfunction has been repaired successfully. 

      NG: REPLACE ECM  (See REMOVAL  )

      OK: END 

4. INSPECT CIRCUIT OPENING RELAY (C/OPN)  (See INSPECTION PROCEDURE )

   NG: REPLACE CIRCUIT OPENING RELAY (C/ OPN)  (See ON-VEHICLE INSPECTION  )

   OK: Go to next step 

5. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE)  (See INSPECTION PROCEDURE )

   NG: Go to step  11

   OK: Go to next step 

6. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECU, FUEL PUMP ECU)  (See INSPECTION PROCEDURE )

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)  (See INSPECTION PROCEDURE )

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

8. INSPECT FUEL PUMP 
   1. Inspect the fuel pump (See INSPECTION ).

      NG: REPLACE FUEL PUMP (See  REMOVAL  ) 

      OK: Go to next step 

9. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)  (See INSPECTION PROCEDURE )

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

10. REPLACE FUEL PUMP ECU 
    1. Replace the fuel pump ECU (see REMOVAL ).
    2. Check the fuel pump operation.

       OK: 

       Malfunction has been repaired successfully. 

       NG: REPLACE ECM  (See REMOVAL  )

       OK: END 

11. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE, INTEGRATION RELAY)  (See INSPECTION PROCEDURE )

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO ECM POWER SOURCE CIRCUIT