Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the engine 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 the fuel pump operation sound occurs when performing the Active Test on the tester.

   OK: 

   Fuel pump operating sound occurs. 

NG: Go to step   2 

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

NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

OK: Go to Next Step 

1. Remove the integration relay from the engine room relay block.
2. Inspect the C/OPN relay.
   1. Measure the C/OPN relay resistance.

      Standard resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Specified Condition
      1E-7 - 1E-13	10 kΩ or higher
      	Below 1 Ω (Apply battery voltage between terminals 1D-12 and 1E-8)

      Fig 1: Identifying Engine Room Junction Block & Engine Room Relay Block

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reinstall the integration relay.

NG: REPLACE ENGINE ROOM JUNCTION BLOCK 

OK: Go to Next Step 

1. Disconnect the A10 and B12 ECM connectors.
2. Measure the voltage between the terminals of the A10 and B12 ECM connectors.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   A10-7 (FC) - B12-81 (E1)	9 to 14 V

   Fig 2: Identifying A10 & B12 ECM Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the ECM connectors.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY) 

OK: Go to Next Step 

NG: REPLACE FUEL PUMP  (See REMOVAL )

OK: Go to Next Step 

1. Check the harness and the connectors between the engine room relay block and the fuel pump.
   1. Disconnect the integration relay connector.
   2. Disconnect the L13 fuel pump connector.
   3. Measure the resistance.

      Standard resistance (Check for open) 

      RESISTANCE REFERENCE (CHECK FOR OPEN)
      
      

      Tester Connection	Specified Condition
      1E-13 - L13-4 (Fuel pump)	Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE REFERENCE (CHECK FOR SHORT)
      
      

      Tester Connection	Specified Condition
      1E-13 or L13-4 (Fuel pump) - Body ground	10 kΩ or higher

2. Check the harness and the connectors between the fuel pump and body ground.
   1. Disconnect the L13 fuel pump connector.
   2. Measure the resistance.

      Standard resistance (Check for open) 

      RESISTANCE REFERENCE (CHECK FOR OPEN)
      
      

      Tester Connection	Specified Condition
      L13-5 (Fuel pump) - Body ground	Below 1 Ω

      Fig 3: Identifying Engine Room Junction Block & Engine Room Relay Block

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the integration relay connector.
4. Reconnect the fuel pump connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM (See  REMOVAL   )