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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 >> Hand-held tester:

Hand-held tester:

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING HAND-HELD TESTER (OPERATE CIRCUIT OPENING RELAY) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn ON the ignition switch. Push the hand-held tester main switch.
    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.

      OK: 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. Measure the resistance of the circuit opening relay.
      Fig 1: Measuring Circuit Opening Relay Resistance
      G02908127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      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: Identifying E9 And E5 ECM Connector Terminals
      G02908128Courtesy 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. 
  4. 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 3: Removing Circuit Opening Relay From R/B Sub-Assembly
        G02908129Courtesy 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.
        • Measure 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 4: Removing Circuit Opening Relay From R/B Sub-Assembly
        G02908130Courtesy 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  ) 
  5. INSPECT FUEL PUMP ASSY 
    1. Measure the resistance of the fuel pump terminals.
      Fig 5: Identifying F12 Fuel Pump Connector Terminals
      G02908131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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.
      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.
    1. NG: REPLACE FUEL PUMP ASSY (See appropriate  Fuel Systems  article) 
    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. Measure the resistance of the wire harness side connectors.
        4. Fig 6: Removing Circuit Opening Relay From R/B Sub-Assembly
        G02908132Courtesy 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 7: Identifying F12 Fuel Pump Connector Terminals (Wire Harness Side)
        G02908133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      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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