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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> Fuel Pump Control Circuit >> Inspection Procedure >> OBD II scan tool (excluding hand-held tester):

OBD II scan tool (excluding hand-held tester):

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FUEL PUMP OPERATION (See  ON-VEHICLE INSPECTION  ) 
    1. Check if there is pressure in the fuel inlet hose.

      HINT:

      The pipe has fuel pressure if the sound of flowing fuel can be heard.

    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: GO TO NEXT STEP. 
  2. CHECK RELAY OPERATION (CIRCUIT OPENING RELAY) 
    1. When connecting between terminal FC of the ECM connector and body ground, check relay operation.
      Fig 1: Identifying E5 ECM Connector Terminals
      G02908134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Noise can be heard from the circuit opening relay. 

    1. OK: Go to step   6 . 
    2. NG: GO TO NEXT STEP. 
  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the R/B sub-assy.
    2. Measure the resistance of the circuit opening relay.
      Fig 2: Measuring Circuit Opening Relay Resistance
      G02908135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 (when Below 1 Ω battery voltage is applied to terminals 1 and 2)
    1. NG: REPLACE CIRCUIT OPENING RELAY 
    2. OK: GO TO NEXT STEP. 
  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.
      Fig 3: Identifying E9 And E5 ECM Connector Terminals
      G02908136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E5-10 (FC) - E9-1 (E1) 9 to 14 V
    1. OK: REPLACE ECM (See  REPLACEMENT  ) 
    2. NG: GO TO NEXT STEP. 
  5. CHECK WIRE HARNESS (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH) 
    1. Check the wire harness between the ECM and circuit opening relay.
      1. Disconnect the E5 ECM connector.
      2. Remove the circuit opening relay from the R/B sub-assy.
      3. Measure the resistance of the wire harness side connectors.
        4. Fig 4: Disconnecting E5 ECM Connector
        G02908137Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E5-10 (FC) - R/B sub-assy circuit opening relay terminal 2 Below 1 Ω
      E5-10 (FC) or R/B sub-assy circuit opening relay terminal 2 - Body ground 10 kΩ or higher
    2. Check the wire harness between the circuit opening relay and ignition switch.
      1. Check the IGN fuse.
        • Remove the IGN fuse from the instrument panel J/B Assy.
        • Check the resistance of the IGN fuse.

          Standard: Below 1 Ω 

        • Reinstall the IGN fuse.
      2. Remove the circuit opening relay from the R/B sub-assy.
      3. Disconnect the I15 ignition switch connector.
      4. Measure the resistance of the wire harness side connectors.
        5. Fig 5: Removing Circuit Opening Relay From R/B Sub-Assembly
        G02908138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      R/B sub-assy circuit opening relay terminal 1 - I15-6 (IG2) Below 1 Ω
      I15-6 (IG2) or R/B sub-assy circuit opening relay terminal 1 - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
  6. INSPECT FUEL PUMP ASSY 
    1. Measure the resistance of the fuel pump terminals.

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Condition 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 the terminals. Check that the pump operates.
        2. Fig 6: Identifying F12 Fuel Pump Connector Terminals
        G02908139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 turns ON and OFF the voltage on the battery side, not the fuel pump side.
    1. NG: REPLACE FUEL PUMP ASSY (See appropriate  Fuel Systems  article) 
    2. OK: GO TO NEXT STEP. 
  7. CHECK WIRE HARNESS (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    1. Check the wire harness between the circuit opening relay and fuel pump.
      1. Remove the circuit opening relay from the R/B Sub-Assy.
      2. Disconnect the F12 fuel pump connector.
      3. Measure the resistance of the wire harness side connectors.
        4. Fig 7: Disconnecting F12 Fuel Pump Connector
        G02908140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      R/B sub-assy circuit opening relay terminal 3 - F12-4 Below 1 Ω
      F12-4 or R/B sub-assy circuit opening relay terminal 3 - Body ground 10 kΩ or higher
    2. Check the wire harness between the fuel pump and body ground.
      1. Disconnect the F12 fuel pump connector.
      2. Measure the resistance between the wire harness side connector and body ground.
        3. Fig 8: Identifying F12 Fuel Pump Connector Terminals (Wire Harness Side)
        G02908141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      F12-5 - Body ground Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
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