Inspection Procedure

1. Check if there is pressure in the fuel inlet hose (See ON-VEHICLE INSPECTION ).

   HINT:

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

OK:  Go to step  5

NG: Go to Next Step 

1. Connect the intelligent 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. 

OK:  Go to step  5

NG: Go to Next Step 

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

   Standard resistance 

   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 Junction Block Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 

OK: Go to Next Step 

1. Turn the ignition switch on (IG).
2. Measure the voltage between the terminals of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

Fig 2: Identifying ECM Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: REPLACE ECM 

NG: CHECK AND REPLACE HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK-IGNITION SWITCH) 

HINT:

Refer to "ECM POWER SOURCE CIRCUIT ".

NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

OK: Go to Next Step 

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

      Standard 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.
      NOTE:

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

Fig 3: Identifying Fuel Pump Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE FUEL PUMP ASSEMBLY 

OK: Go to Next Step 

1. Check the harness and connector between the fuel pump and circuit opening relay.
   1. Disconnect the fuel pump connector.
   2. Remove the engine room junction block.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (K7-4) - Engine room junction block (circuit opening relay) (1D-3)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (K7-4) 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.
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 resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      Fuel pump (K7-5) - Body ground	Below 1 Ω

   3. Reconnect the fuel pump connector.

Fig 4: Identifying Engine Room Junction Block And Fuel Pump Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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