Fuel Pump Control Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Select the following menu items: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.
4. Check whether the fuel pump operation sound occurs when performing the Active Test on the Techstream.

   OK

   Fuel pump operating sound occurs.

NG → See step   3 

OK → See step   2 

NG → REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Remove the integration relay from the engine room relay block.
   Fig 1: Identifying Engine Room Junction Block & Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the C/OPN relay.
   1. Measure the C/OPN relay resistance.

      Standard resistance

      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)

3. Reinstall the integration relay.

NG → REPLACE ENGINE ROOM JUNCTION BLOCK 

OK: Go to next step 

1. Disconnect the A10 and B12 ECM connectors.
   Fig 2: Identifying A10 & B12 ECM Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage between the terminals of the A10 and B12 ECM connectors.

   Standard voltage

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

3. Reconnect the ECM connectors.

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

OK: Go to next step 

NG → See step   9 

OK: Go to next step 

1. Check the harness and the connectors between the engine room relay block and the fuel pump.
   Fig 3: Identifying Engine Room Junction Block & Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the integration relay connector.
   2. Disconnect the L13 fuel pump connector.
   3. Measure the resistance.

      Standard resistance (Check for open)

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

      Standard resistance (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)

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

3. Reconnect the integration relay connector.
4. Reconnect the fuel pump connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8