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Home >> Toyota >> 2009 >> Highlander Base, 2.7 A >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (1AR-FE) - Circuit Testing, Component Inspection, Removal & Installation >> Fuel Pump Control Circuit >> Inspection Procedure
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Inspection Procedure

NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE THE FUEL PUMP SPEED CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream on.
    3. Enter the following menus: Powertrain/Engine/Active Test/Control the Fuel Pump/Speed.
    4. Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.

      OK: 

      Fuel pump operating sound occurs. 

      NG: Go to step 2 

      OK: PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE )

  2. INSPECT RELAY (C/OPN RELAY) 
    1. Remove the C/OPN relay from the engine room relay block.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Battery voltage applied between terminals 1 and 2 Below 1 Ω
      Fig 1: C/OPN Relay Circuit Diagram
      G04942983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the C/OPN relay.

      NG: REPLACE RELAY (C/OPN RELAY) 

      OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM) 
    1. Disconnect the ECM connector.
    2. Remove the C/OPN relay from the engine room relay block.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D60-34 (FC) - C/OPN relay terminal 2 Always Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D60-34 (FC) or C/OPN relay terminal 2 - Body ground Always 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reinstall the C/OPN relay.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 2: Identifying C/OPN Relay And ECM Connector
      G06111231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  4. INSPECT ENGINE ROOM RELAY BLOCK (IG2 RELAY - C/OPN RELAY) 
    1. Remove the IG2 relay from the engine room relay block.
    2. Remove the C/OPN relay from the engine room relay block.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      IG2 relay terminal 3 - C/OPN relay terminal 1 Always Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      IG2 relay terminal 3 or C/OPN relay terminal 1 - Body ground Always 10 kΩ or higher
    4. Reinstall the IG2 relay.
    5. Reinstall the C/OPN relay.

      NG: REPLACE ENGINE ROOM RELAY BLOCK ASSEMBLY 

      Fig 3: Identifying IG2 Relay And C/OPN Relay Location
      G06111232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP) 
    1. Remove the C/OPN relay from the engine room relay block.
    2. Disconnect the fuel pump connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      C/OPN relay terminal 3-O9-4 Always Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      C/OPN relay terminal 3 or O9-4 - Body ground Always 10 kΩ or higher
    4. Reinstall the C/OPN relay.
    5. Reconnect the fuel pump connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 4: Identifying C/OPN Relay And Fuel Pump Connector
      G06111233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND) 
    1. Disconnect the fuel pump connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      O9-5 - Body ground Always Below 1 Ω
    3. Reconnect the fuel pump connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 5: Identifying Fuel Pump Connector Terminals
      G06111234Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  7. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (See INSPECTION ).

      NG: REPLACE FUEL PUMP  (See REMOVAL )

      OK: REPLACE ECM  (See REMOVAL  )

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