Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch to the ON position, push Techstream or the OBD II scan tool main switch on.
3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
4. Check the relay operation while operating it using Techstream.

   Standard: 

   Operating noise can be heard from the relay. 

OK:  Go to step  5

NG: Go to Next Step 

1. Remove the C/OPN relay from the engine room J/B.
2. Measure the resistance of the C/OPN relay.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   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)

   Fig 1: Inspecting C/OPN Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RELAY 

OK: Go to Next Step 

1. Turn the ignition switch to the ON position.
2. Measure the voltage of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   FC (E4-10) - E1 (E6-1)	9 to 14 V

   Fig 2: Identifying ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM 

NG: Go to Next Step 

1. Check the wire harness between the ECM and C/OPN relay.
   1. Disconnect the ECM connector.
   2. Remove the C/OPN relay from the engine room J/B.
   Fig 3: Identifying C/OPN Relay From Engine Room J/B
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION
      
      

      Terminal Connections	Specified Condition
      FC (E4-10) - C/OPN relay (2)	Below 1 Ω
      FC (E4-10) or C/OPN relay (2) - Body ground	10 kΩ or higher

2. Check the wire harness between the C/OPN relay and ignition switch.
   1. Check the IG2 fuse.
      • Remove the IG2 fuse from the engine room J/B.
      • Check the resistance of the IG2 fuse.

        Standard resistance: 

        Below 1 Ω 

      • Reinstall the IG2 fuse.
   2. Remove the C/OPN relay from the engine room J/B.
   3. Disconnect the ignition switch connector.
   4. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION
      
      

      Terminal Connections	Specified Condition
      J/B C/OPN relay terminal 1 - I15-6	Below 1 Ω
      J/B C/OPN relay terminal 1 or I15-6 -Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM 

1. Measure the resistance of the fuel pump.
   Fig 4: Identifying Fuel Pump Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Measure the resistance between terminals 4 and 5.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION
      
      

      Terminal Connections	Condition	Specified Condition
      4 - 5	20°C (68°F)	0.2 to 0.3 Ω

2. Check operation of the fuel pump.
   1. Apply battery voltage to both terminals. Check that the 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 turn ON and OFF the voltage on the battery side, not the fuel pump side.

NG: REPLACE FUEL PUMP 

OK: Go to Next Step 

1. Check the wire harness between the C/OPN relay and fuel pump.
   1. Remove the C/OPN relay from the engine room J/B.
   Fig 5: Identifying C/OPN Relay From Engine Room J/B And Fuel Pump Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the fuel pump connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      C/OPN relay terminal 3 - F8-4	Below 1 Ω
      C/OPN relay terminal 3 or F8-4 - Body ground	10 kΩ or higher

2. Check the wire harness between the fuel pump and body ground.
   1. Disconnect the fuel pump connector.
   Fig 6: Identifying Fuel Pump Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance of the wire harness side connector and body ground.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      F8-5 (Fuel pump) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK ECM