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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (SFI) - Diagnostics (3MZ-FE) >> Fuel Pump Control Circuit >> Inspection Procedure >> Hand held tester:

Hand held tester:

  1. PERFORM ACTIVE TEST USING HAND HELD TESTER (OPERATE C/OPN RELAY) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
    4. Check the relay operation while operating it with the hand-held tester.

      Standard: Operating noise can be heard from the relay. 

    1. OK: Go to step   5 
    2. NG: GO TO NEXT STEP. 
  2. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the R/B sub-assy.
    2. Check the resistance of the circuit opening relay.
      Fig 1: Inspecting Circuit Opening Relay
      G02908564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Tester connection and specified condition table

      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)
    1. NG: REPLACE CIRCUIT OPENING RELAY 
    2. OK: GO TO NEXT STEP. 
  3. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.
      Fig 2: Inspecting ECM (FCV Voltage)
      G02908565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Tester Connection and specified condition table

      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. 
  4. CHECK WIRE HARNESS (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION) 
    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. Check the resistance of the wire harness side connectors.
        4. Fig 3: Checking Wire Harness Between ECM And Circuit Opening Relay
        G02908566Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Tester Connection and specified condition table

      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 around 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. Check the resistance of the wire harness side connectors.
        5. Fig 4: Checking Wire Harness Between Circuit Opening Relay And Ignition Switch
        G02908567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Tester connection and specified condition table

      Tester Connection Specified Condition
      R/B sub-assy circuit opening relay terminal 1 - I15-6 Below 1 Ω
      I15-6 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  ) 
  5. INSPECT FUEL PUMP ASSY 
    1. Check the fuel pump resistance.
      1. Measure the resistance between terminals 4 and 5.

      Standard: 0.2 to 3.0 Ω at 20°C (68°F) 

    2. Check the fuel pump operation
      1. Apply battery voltage to both the terminals. Check that the pump operates.
      NOTE:
      • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
      • Keep 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.
      Fig 5: Identifying Fuel Pump Connector Terminals
      G02908568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE FUEL PUMP ASSY 
    2. OK: GO TO NEXT STEP. 
  6. 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. Check the resistance of the wire harness side connectors.
        4. Fig 6: Checking Wire Harness Between Circuit Opening Relay And Fuel Pump
        G02908569Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Tester connection and specified condition table

      Tester Connection Specified Condition
      R/B sub-assy circuit opening relay terminal 3 - F12-4 Below 1 Ω
      R/B sub-assy circuit opening relay terminal 3 or F12-4 - 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. Check the resistance the wire harness side connectors.
        Fig 7: Checking Wire Harness Between Fuel Pump And Body Ground
        G02908570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard: 

        Tester connection and specified condition table

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