Inspection Procedure

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.

1. OK: Go to step   5 . 
2. NG: Go to next step. 

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch on (IG) and turn the tester on.
3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/SPD.
4. Check whether operating sounds can be heard while operating the relay using the tester.

   OK: Operating sounds can be heard from the relay. 

1. OK: Go to step   5 . 
2. NG: Go to next step. 

1. Remove the engine room junction block.
2. Measure the circuit opening relay resistance.

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connections	Specified Conditions
   1D-5 - 1D-3	10 kΩ or higher
   1D-5 - 1D-3	Below 1 Ω (when battery voltage applied to terminals 1G-5 and 1H-9)

3. Reinstall the engine room junction block.
   Fig 1: Identifying Engine Room

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSY 
2. OK: Go to next step. 

1. Turn the ignition switch on (IG).
2. Measure the voltage between the terminals of the A24 and B47 ECM connectors.
   Fig 2: Measuring Voltage Between Terminals Of A24 And B47 ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connections	Specified Conditions
   FC (A24-10) - E1 (B47-1)	9 to 14 V

1. OK: REPLACE ECM (SEE  REPLACEMENT  ) 
2. NG: CHECK AND REPAIR HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - IGNITION SWITCH) 

1. NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 
2. OK: Go to next step. 

1. Inspect fuel pump resistance.
   1. Disconnect the L8 fuel pump connector.
   2. Measure the resistance between terminals 4 and 5.

      Resistance: 0.2 to 3.0 Ω at 20°C (68°F) 

2. Inspect fuel pump operation.
   1. Apply battery voltage to both terminals. Check that the fuel pump operates.
      Fig 3: Identifying L8 Component Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE FUEL PUMP ASSY (SEE  REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY  ) 
2. OK: Go to next step. 

1. Check the harness and connector between the fuel pump and circuit opening relay.
   1. Disconnect the L8 fuel pump connector.
   2. Remove the engine room junction block.
   3. Measure the resistance between the terminals of the engine room junction block (circuit opening relay) and fuel pump connector.

      Standard (Check for open): 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (L8-4) - Engine room junction block (circuit opening relay) (1D-3)	Below 1 Ω

      Fig 4: Identifying L 8 Harness Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (L8-4) or Engine room junction block (circuit opening relay) (1D-3) - Body ground	10 kΩ or higher

   4. Reconnect the fuel pump connector.
   5. Reinstall the engine room junction block.
      Fig 5: Identifying Engine Room Junction Block

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the harness and connector between the fuel pump and body ground.
   1. Disconnect the fuel pump connector.
   2. Measure the resistance between the terminal of the fuel pump connector and body ground.

      Standard (Check for open): 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (L8-5) - Body ground	Below 1 Ω

   3. Reconnect the fuel pump connector.

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE  )