Inspection Procedure

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

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER OR TECHSTREAM (FUEL PUMP) 
   1. Connect the intelligent tester or Techstream to the DLC3.
   2. Turn the ignition switch ON and turn the tester ON.
   3. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP /SPD.
      2. Techstream - Select: 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 tester.

      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. INSPECT FUEL PUMP ECU (FPC SIGNAL)  (see INSPECTION PROCEDURE )

   NG: REPLACE ECM  (see REMOVAL  )

   OK: REPLACE FUEL PUMP ECU  (See REMOVAL )

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. INSPECT FUEL PUMP ECU (FPC SIGNAL)  (see INSPECTION PROCEDURE )

    NG: REPLACE ECM  (see REMOVAL  )

    OK: REPLACE FUEL PUMP ECU  (See REMOVAL )

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