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Fuel Pump Control Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATION OF C/OPN RELAY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to the ON position and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
    4. Check whether operating sounds can be heard while operating the relay using the Techstream.

      OK

      Operating sounds can be heard from relay.

    OK → See step   7 

    NG: Go to next step 

  2. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Inspect the ECM Power Source Circuit. Refer to ECM Power Source Circuit .

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

    OK: Go to next step 

  3. INSPECT C/OPN RELAY 
    1. Disconnect the 1A, 1B, 1E and 1F instrument panel junction block connectors.
      Fig 1: Inspecting C/OPN Relay
      GTY167051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      1B (11) - 1A (8) 10 kΩ or higher
      1B (11) - 1A (8) Below 1 Ω
      (when battery voltage is applied to terminals 1E (5) and 1F (4))
    3. Reconnect the instrument panel junction block connectors.

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK: Go to next step 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Disconnect the E4 and E8 ECM connectors.
      Fig 2: Identifying E1 And FC Terminal Of ECM Connector
      GTY161397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      FC (E4-25) - E1 (E8-3) 11 to 14 V
    4. Reconnect the ECM connectors.

    OK → See step   9 

    NG: Go to next step 

  5. CHECK WIRE HARNESS (IGNITION SWITCH - C/OPN RELAY) 
    1. Disconnect the I5 ignition switch connector.
      Fig 3: Identifying I5 Ignition Switch Connector Terminals
      GTY161978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Disconnecting 1F Instrument Panel Junction Block Connector
      GTY156907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 1F instrument panel junction block connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      IG2 (I5-6) - Instrument panel junction block (1F-4) Below 1 Ω
      IG2 (I5-6) or Instrument panel junction block (1F-4) - Body ground 10 kΩ or higher
    4. Reconnect the ignition switch connector.
    5. Reconnect the instrument panel junction block connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK WIRE HARNESS (ECM - C/OPN RELAY) 
    1. Disconnect the E4 ECM connector.
      Fig 5: Identifying FC Terminal Of ECM Connector
      GTY165286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 1E instrument panel junction block connector.
      Fig 6: Disconnecting 1E Instrument Panel Junction Block Connector
      GTY156906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      FC (E4-25) - Instrument panel junction block (1E-5) Below 1 Ω
      FC (E4-25) or Instrument panel junction block (1E-5) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the instrument panel junction block connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   11 

  7. INSPECT FUEL PUMP 
    1. Inspect the fuel pump. Refer to INSPECTION - Step 1 .

    NG → See step   10 

    OK: Go to next step 

  8. CHECK WIRE HARNESS (FUEL PUMP - C/OPN RELAY, BODY GROUND) 
    1. Disconnect the 1A instrument panel junction block connector.
      Fig 7: Identifying 1A Instrument Panel Junction Block Connector
      GTY156905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the F9 fuel pump connector.
      Fig 8: Identifying F9 Fuel Pump Connector
      GTY163078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      Instrument panel junction block (1A-8) - Fuel pump (F9-4) Below 1 Ω
      Fuel pump (F9-5) - Body ground Below 1 Ω
      Instrument panel junction block (1A-8) or Fuel pump (F9-4) - Body ground 10 kΩ or higher
    4. Reconnect the instrument panel junction block connector.
    5. Reconnect the fuel pump connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → CHECK AND REPAIR HARNESS AND CONNECTOR (EFI RELAY - C/OPN RELAY) 

  9. REPLACE ECM. Refer to  REMOVAL 
  10. REPLACE FUEL PUMP. Refer to  REMOVAL 
  11. REPLACE ECM. Refer to  REMOVAL 
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