Fuel Pump Control Circuit: Wiring Diagram

Refer to DTC P0230 .

1. CHECK FUEL PUMP OPERATION 
   1. Check if there is pressure in the fuel inlet hose.

   HINT:

   If there is fuel pressure, you will hear the sound of fuel flowing.

   OK: GO TO STEP   10 

   NG: Go To Next Step 

   OK: Go To Next Step 

2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY) 
   1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
   2. Turn the ignition switch ON and turn the intelligent tester ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
   4. Check the relay operation when it is operated by the intelligent tester.

   Standard: 

   OK: GO TO STEP   5 

   NG: Go To Next Step 

   OK: Go To Next Step 

3. INSPECT CIRCUIT OPENING RELAY (Marking: C/OPN) 
   1. Operating sound can be heard from the relay. (a) Remove the circuit opening relay from the engine room
   2. relay block.

      (b) Measure the resistance of the circuit opening relay. 

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      3 - 5	10 kΩ or higher
      3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

   3. Reinstall the circuit opening relay.

   NG: REPLACE CIRCUIT OPENING RELAY 

   Fig 1: Identifying Relay Test Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go To Next Step 

4. INSPECT ECM (FC VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Measure the voltage of the E6 and E10 ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   E10-10 (FC) - E6-1 (E1)	9 to 14 V

   OK: REPLACE ECM 

   Fig 2: Measuring Voltage Of E6 And E10 ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH) 

   OK: Go To Next Step 

5. CHECK ECM POWER SOURCE CIRCUIT 
   1. Check ECM POWER SOURCE CIRCUIT  .

   NG: REPAIR OR REPLACE 

   OK: Go To Next Step 

6. INSPECT FUEL PUMP RELAY (Marking: F/PUMP) 
   1. Remove the fuel pump relay from the engine room relay block.
   2. Measure the resistance of the fuel pump relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      3 - 4	Below 1 Ω
      3 - 5	10 kΩ or higher
      3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
      3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

   3. Reinstall the fuel pump relay.

   NG: REPLACE FUEL PUMP RELAY 

   Fig 3: Identifying Relay Test Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go To Next Step 

7. INSPECT FUEL PUMP 
   1. Inspect fuel pump resistance.
      1. Disconnect the F13 fuel pump connector.
      2. Measure the resistance of the fuel pump.

         Standard resistance 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         4 - 5	0.2 to 3.0 Ω at 20°C (68°F)

      3. Reconnect the fuel pump connector.
   2. Inspect fuel pump operation.
      1. Apply battery voltage to F13-4 (+) and F13-5 (-) terminals. Check that the pump operates.
   NOTE:

   • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
   • Keep fuel pump as far away from the battery as possible.
   • Always do the switching at the battery side.

   NG: REPLACE FUEL PUMP 

   Fig 4: Identifying F13 Fuel Pump Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go To Next Step 

8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY, FUEL PUMP - BODY GROUND) 
   1. Check harness and connector (ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go To Next Step 

9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY) 
   1. Check harness and connector (ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

10. INSPECT FUEL PUMP RELAY (Marking: F/PUMP) 
    1. Remove the fuel pump relay from the engine room relay block.
    2. Measure the resistance of the fuel pump relay.

       Standard resistance 

       TESTER CONNECTION SPECIFIED CONDITION
       
       

       Tester Connection	Specified Condition
       3 - 4	Below 1 Ω
       3 - 5	10 kΩ or higher
       3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
       3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

    3. Reinstall the fuel pump relay.
    Fig 5: Identifying Relay Test Terminals

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUEL PUMP RELAY 

    OK: Go To Next Step 

11. INSPECT FUEL PUMP RESISTOR (RESISTANCE) 
    1. Inspect the fuel pump resistor resistance.
       1. Measure the resistance of the terminals.

    Resistance: 0.94 to 1.0 Ω at 20°C (68°F) 

    NG: REPLACE FUEL PUMP RESISTOR 

    Fig 6: Inspecting Fuel Pump Resistor Resistance

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go To Next Step 

12. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR, FUEL PUMP RESISTOR - FUEL PUMP) 
    1. Check harness and connector (ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR