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OBD II Scan Tool (Excluding the Hand-Held Tester):

  1. CHECK OPERATION OF FUEL PUMP 
    1. Turn the ignition switch to ON.
    2. Connect terminals FC and E01 of the ECM connector.
    3. Check for fuel pressure in the fuel inlet hose when it is pinched off.

      Result: There is pressure in fuel inlet hose. 

    HINT: At this time, operating sounds can be heard from the fuel pump.

    Fig 1: Connecting Terminals FC & E01 Of ECM Connector
    G03196355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Checking Fuel Pressure In Fuel Inlet Hose
    G03196356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
    2. NG : GO TO NEXT STEP 
  2. INSPECT  ECM POWER SOURCE CIRCUIT  
    1. NG : REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 
    2. OK : GO TO NEXT STEP 
  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the instrument panel J/B.
    2. Check the circuit opening relay resistance.

      Standard: 

      CIRCUIT OPENING RELAY RESISTANCE SPECIFICATIONS

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the circuit opening relay.
      Fig 3: Inspecting Circuit Opening Relay
      G03196357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE CIRCUIT OPENING RELAY 
    2. OK : GO TO NEXT STEP 
  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E3 and E6 ECM connectors.

    Standard: 

    E3 AND E6 ECM CONNECTORS VOLTAGE SPECIFICATIONS

    Tester Connections Specified Conditions
    FC (E6-10) - E01 (E3-7) Between 9 V and 14 V
    Fig 4: Measuring Voltage Between Terminals Of E3 & E6 ECM Connectors
    G03196358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : REPLACE ECM (See  REPLACEMENT  ) 
    2. NG : GO TO NEXT STEP 
  5. CHECK HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 
    1. Remove the EFI relay from the engine room R/B.
    2. Remove the circuit opening relay from the instrument panel J/B.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      EFI relay (3) - Circuit opening relay (1) Below 1 Ω
      EFI relay (3) - Circuit opening relay (5) Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified Conditions
      EFI relay (3) or Circuit opening relay (1) - Body ground 10 kΩ or higher
      EFI relay (3) or Circuit opening relay (5) - Body ground 10 kΩ or higher
      Fig 5: Removing EFI Relay From Engine Room R/B
      G03196359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reinstall the EFI relay.
    5. Reinstall the circuit opening relay.
      Fig 6: Removing Circuit Opening Relay From Instrument Panel J/B
      G03196360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) 
    1. Disconnect the E6 ECM connector.
    2. Remove the circuit opening relay from the instrument panel J/B.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      FC (E6-10) - Instrument panel J/B (Circuit opening relay terminal 2) Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified Conditions
      FC (E6-10) or Instrument panel J/B (Circuit opening relay terminal 2) - Body ground 10 kΩ or higher
      Fig 7: Disconnecting E6 ECM Connector
      G03196361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ECM connector.
    5. Reinstall the circuit opening relay.
      Fig 8: Removing Circuit Opening Relay From Instrument Panel J/B
      G03196362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
  7. INSPECT FUEL PUMP (See  INSPECTION  ) 
    1. NG : REPLACE FUEL PUMP (See  REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY  ) 
    2. OK : GO TO NEXT STEP 
  8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) 
    1. Remove the circuit opening relay from the instrument panel J/B.
    2. Disconnect the F15 fuel pump connector.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) - Fuel pump (F15-4) Below 1 Ω
      Fuel pump (F15-5) - Body ground Below 1 Ω

      Standard (Check for short): 

      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified Conditions
      Instrument panel J/B (Circuit opening relay terminal 3) or Fuel pump (F15-4) - Body ground 10 kΩ or higher
      Fig 9: Removing Circuit Opening Relay From Instrument Panel J/B
      G03196363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the fuel pump connector.
    5. Reinstall the circuit opening relay.
      Fig 10: Disconnecting F15 Fuel Pump Connector
      G03196364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
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